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Influencing Factors and Promotion Strategies of the First-cycle Coulombic Efficiency of Silicon Suboxide Anodes in Lithium-ion Batteries LI Huiyang, ZHU Siying, LI Sha, ZHANG Qiaobao, ZHAO Jinbao, ZHANG Li Chem. J. Chinese Universities    2021, 42 (8): 2342-2358.   DOI: 10.7503/cjcu20210177 Abstract （2906）   HTML （107）    PDF（pc） （17233KB）（1110）       Knowledge map    Save The popularity of electric vehicles and various portable electronic devices has led to higher demands on battery energy density. Silicon suboxide（SiOx， 0<x≤2） shows high specific capacity and low Li-ion insertion potential， and the volume expansion effect is significantly lower than that of pure silicon anode， and therefore is considered to be one of the ideal alternatives to traditional graphite anode materials. However， the solid electrolyte interphase（SEI） and a large number of irreversible products are formed during the first lithiation/delithiation cycle， resulting in low Coulombic efficiency， which seriously hinders the practical application of SiOx anodes. On the basis of SiOx structure， this review systematically explained the lithium storage mechanism of SiOx anode and the reason for the low first-cycle efficiency. Further， strategies of improving the first Coulombic efficiency of SiOx anode in recent years is summarized in detail. Finally， the future direction of improving the first-cycle efficiency of SiOx anode is also forecasted. Table and Figures | Reference | Related Articles | Metrics

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Coating Strategies of Ni-rich Layered Cathode in LIBs WANG Yimeng, LIU Kai, WANG Baoguo Chem. J. Chinese Universities    2021, 42 (5): 1514-1529.   DOI: 10.7503/cjcu20200489 Abstract （2012）   HTML （78）    PDF（pc） （27413KB）（1373）       Knowledge map    Save With the exhaustion of traditional energy resources and the emergence of environmental problems， lithium ion battery has gradually become a widely used energy storage system due to its higher volume/weight energy density， longer service life， lower self-discharge rate and other advantages. Compared with the traditional cathode such as LiCoO2， LiFePO4etc， Nickel-rich layered cathode Li［Ni1-x-yCoxMny］O2（NCM） has become the most preferred cathode materials for due to its advantages of high voltage and high capacity. Although NCM cathode material has the advantages mentioned above， it still faces the problems of cycle stability， rate capability and safety issues before further practical application. These performance deficiencies come from the unstable crystal structure of the NCM material， the side reaction on the positive electrode-electrolyte interface， the high interface resistance and so on. To solve these problems， a lot of work has been done to optimize the electrochemical properties of nickel-rich cathode， which is almost studied around the electrode-electrolyte interface. In this review， we summarized the degradation mechanism of capacity battery performance with NCM cathode， and the optimizing strategy of NCM cathode. And then， main coating strategies including electrochemical inactive coating， li-reactive coating， lithium-ion conductive coating are discussed. On this basis， we summarized the ideas and effects of various surface coating strategies， and finally proposed the prospect about the development of NCM cathode materials. Table and Figures | Reference | Related Articles | Metrics

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Overview of Transition Metal Phosphide Catalysts and Hydrogen Production by Electrolyzed Water JI Xiaohao, WANG Zumin, CHEN Xiaoyu, YU Ranbo Chem. J. Chinese Universities    2021, 42 (5): 1377-1394.   DOI: 10.7503/cjcu20200658 Abstract （1739）   HTML （85）    PDF（pc） （23877KB）（958）       Knowledge map    Save Hydrogen energy is a green and efficient secondary energy source. With the help of cheap non-precious metal catalysts， electrolysis of water to produce hydrogen has attracted widespread attention because of its low cost and high efficiency. The transition metal phosphide can expose more coordinated unsaturated surface atoms due to its unique nearly spherical triangular prism unit structure， so it exhibits excellent catalytic activity， strong corrosion resistance and high efficiency in the production of hydrogen from electrolyzed water. This article mainly reviews the preparation methods of transition metal phosphides and their application and performance improvement in electrocatalytic hydrogen evolution. Finally， some problems that need to be solved in transition metal phosphide catalysts are discussed， which is beneficial to the development of other non-noble metal electrolyzed hydrogen production catalysts. Table and Figures | Reference | Related Articles | Metrics

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Catalysis in Li-sulfur Battery： Materials and Characterization GENG Chuannan, HUA Wuxing, LING Guowei, TAO Ying, ZHANG Chen, YANG Quanhong Chem. J. Chinese Universities    2021, 42 (5): 1331-1339.   DOI: 10.7503/cjcu20210003 Abstract （1737）   HTML （60）    PDF（pc） （7177KB）（1363）       Knowledge map    Save Lithium-sulfur（Li-S） battery is a promising next-generation energy storage system with ultrahigh energy density. However， the intrinsic “solid-liquid-solid” sluggish reaction causes unexpected shuttling of polysulfides， severely limiting the energy density and cycling performance. How to accelerate the reversible sulfur redox reaction has become the key to realize the breakthrough in the practical use of Li-S battery. Recently， the catalysis process has been introduced into Li-S battery. The introduction of high-efficiency catalysts into Li-S battery can reduce the energy barrier of sulfur conversion， and accelerate the "solid-liquid-solid" reaction. Thus， the shuttling of polysulfides can be reduced with a much lower electrolyte usage， further impro-ving the overall performance of Li-S battery. Herein， the research progress of high-efficiency catalysts in Li-S battery is systematically summarized and in?situ characterization techniques are proposed as significant strategy to illustrate the catalytic mechanism in Li-S battery. Moreover， comprehensive perspectives are given to guide the further research and development of Li-S battery. Table and Figures | Reference | Related Articles | Metrics

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Synthesis and Device Optimization of Highly Efficient Metal Halide Perovskite Light-emitting Diodes WANG Kunhua, YAO Jisong, YANG Junnan, SONG Yonghui, LIU Yuying, YAO Hongbin Chem. J. Chinese Universities    2021, 42 (5): 1464-1479.   DOI: 10.7503/cjcu20200670 Abstract （1729）   HTML （75）    PDF（pc） （10840KB）（1014）       Knowledge map    Save Metal halide perovskites have emerged as a new family of semiconducting materials in the applications of highly efficient light-emitting diodes（LEDs）. However， the efficient and stable metal halide perovskite LED could be achieved only if the low photoluminescent（PL） efficiency and instability issues of metal halide perovskite materials are addressed. In order to increase the exciton binding energy of the metal halide perovskite as an emitting layer in the LED， the fabrication of nano-sized perovskite is an effective way， which can increase the exciton binding energy by reducing the size or dimension， thus increasing photoluminescent efficiency. Though the perovskite-based LEDs in the green and red light spectral range have demonstrated high brightness and good efficiency， the highest external quantum efficiencies（EQEs） of which are even exceeding 20%， their stability still cannot satisfy the requirements of practical applications. More importantly， the performance of blue metal halide perovskite LED is still limited by the low light emission efficiency of present metal halide perovskites. Therefore， the fabrication of highly efficient and stable perovskite LEDs， especially the blue perovskite LED， is the most challenging issue for realizing the practical application of perovskite LEDs. In this review， we have summarized the strategies to synthesize the perovskite emitter layers and reviewed the research progress of metal halide perovskite LEDs. We also discussed the causes of instability of metal halide perovskite LED， and finally we present insight toward future research directions and an outlook to further improve EQEs and stabilities of perovskite LEDs aiming to practical applications. Table and Figures | Reference | Related Articles | Metrics

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Research Progress of Quasi-two-dimensional Perovskite Solar Cells YUE Shengli, WU Guangbao, LI Xing, LI Kang, HUANG Gaosheng, TANG Yi, ZHOU Huiqiong Chem. J. Chinese Universities    2021, 42 (6): 1648-1671.   DOI: 10.7503/cjcu20200863 Abstract （1699）   HTML （87）    PDF（pc） （22856KB）（1232）       Knowledge map    Save Quasi-two-dimensional（2D） perovskite（organic-inorganic hybrid） has attracted enormous attention in solar cells due to its excellent stability， crystallinity and photoelectric properties. In contrast to the 3D perovskite， the unique layered crystal structure endows some extraordinary properties of quasi-2D perovskites， which is due to the intercalation of organic spacer cations（OSC） into the 3D framework. （1） The multilayer quantum wells create the anisotropic photoelectric properties. （2） The spacer cations change the environment of the clusters in precursor solution to achieve high-quality perovskite films. （3） The hydrophobic spacer layers with inhibition of ion migration realize excellent stability of quasi-2D perovskites films. However， the photoelectric transformation efficiency（PCE） of quasi-2D perovskite solar cells（PSCs） is still far less than that of 3D counterparts due to quantum confinement effect， dielectric confinement effect， non-preferred crystal orientation and random phase distributions of quasi-2D perovskites films. In order to solve these problems and achieve the balance between the PCE and stability of solar cells， it should be better understood of 2D perovskites from the crystal structures， photoelectric properties as well as the device performances. In this paper， we first introduce the crystal types including the （100）， （110） and （111）-oriented structures. On this basis， the preferred orientations（out-of-plane and in-plane） and uniform/graded phase distributions are overviewed for the most studied （100）-oriented structure. To the understanding of the nucleation and crystallization processes of quasi-2D perovskite films， we then discuss the preparation methods from the perspective of one-step and two-step film-casting， respectively. Furthermore， we summarized the extensive researches on quasi-2D-PSCs and analyzed a series of significant results. Meanwhile， we highlight internal mechanism of quasi-2D perovskites stability and summarize superior long-term stability of quasi-2D perovskites and 3D/2D heterojunction perovskites. Last but not least， we further looked ahead to research trends in the future， such as： phase purity of 2D perovskites thin films， graded phase 2D perovskites thin films， modified interface， design of new organic spacer cations， 3D/2D heterojunction perovskites. Table and Figures | Reference | Related Articles | Metrics

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Recent Progress in Photoelectrochemical H2 Production Coupled with Biomass-derived Alcohol/aldehyde Oxidation CHEN Wangsong, LUO Lan, LIU Yuguang, ZHOU Hua, KONG Xianggui, LI Zhenhua, DUAN Haohong Chem. J. Chinese Universities    2022, 43 (2): 20210683-.   DOI: 10.7503/cjcu20210683 Abstract （1605）   HTML （122）    PDF（pc） （2953KB）（1099）       Knowledge map    Save Biomass-derived alcohol/aldehydes are important platform compounds， which can be further converted into high-value-added chemicals or fuels through catalytic oxidation. Photoelectrocatalytic（PEC） technology driven by solar energy is one of the most green and efficient ways to realize the oxidation of biomass-derived alcohol/aldehydes. Compared with the traditional PEC water splitting process to produce both O2 and H2， the use of PEC oxidation of biomass-derived alcohol/aldehydes instead of anodic oxygen evolution process can not only increase the value of anodic products， but also improve the conversion efficiency of solar energy to hydrogen， which is of great significance for H2 production and high value chemical synthesis. In this review， we introduce the reaction mechanism of PEC H2 production coupled with biomass-derived alcohol/aldehyde oxidation， and summarize the recent progress in PEC oxidation of biomass-derived alcohol/aldehydes. Moreover， the opportunities and challenges in this field are also prospected. Table and Figures | Reference | Related Articles | Metrics

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Simulation of the Electrochemistry Process with the Coupling of Multiple Physical Fields for All-solid-state Lithium Batteries SUN Zhetao, HE Yingjie, CHEN Shaojie, NIE Lu, HUANG Yuanqi, LIU Wei Chem. J. Chinese Universities    2021, 42 (5): 1598-1609.   DOI: 10.7503/cjcu20200451 Abstract （1592）   HTML （92）    PDF（pc） （4997KB）（735）       Knowledge map    Save The finite element simulation of lithium phosphorus oxynitride（LiPON）-based all-solid-state lithium batteries is performed based on COMSOL Multiphysics which is a Multiphysics simulation platform. Utilizing the interfaces of tertiary current distribution， dilute substance transfer， solid heat transfer and solid mechanics， the coupling of multiple physical fields in the solid-state battery system is realized. At the same time， the electrochemical performance simulation for the all-solid-state lithium battery itself under given physical parameters is also completed. In this model， the thermal management and stress distribution of the battery during operation are effectively calculated. The deposition data on the lithium anode surface was used to analyze the possible causes of lithium dendrite growth. The results showed that the capacity decay of an all-solid lithium batteries and the safety management out of control such as dendrite growth are not just the result of single factor control. The system’s concentration gradient， pre-stress distribution of stress， the speed-control step of heat and mass transfer processes and volume change during the charge and discharge process will all have different effects on battery performance and safety management. Table and Figures | Reference | Supplementary Material | Related Articles | Metrics

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Current Advances and Future Challenges of Single-atom Catalysis ZHUANG Jiahao, WANG Dingsheng Chem. J. Chinese Universities    2022, 43 (5): 20220043-.   DOI: 10.7503/cjcu20220043 Abstract （1515）   HTML （73）    PDF（pc） （30735KB）（548）       Knowledge map    Save Single-atom catalysts（SACs）， which combines the advantages of homogeneous and heterogeneous catalysts， have attracted great research interest due to their maximum atomic utilization efficiency， superior catalytic performance and easy separation from reaction systems. However， due to the high surface energy and thus instability of single atoms， it remains a great challenge to rational design and fabricate stable SACs. In this review， we summarized and discussed the advances of stabilizing strategies， high-loading synthesis and batch preparation for SACs in recent years. We also envisioned the challenges on the future development of SACs. Finally， the research prospect of single-atom catalysis was forecasted. Table and Figures | Reference | Related Articles | Metrics

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Recent Advances on Hydrocarbonylation of Unsaturated Hydrocarbons by Involving Carbon Monoxide WANG Peng, LIU Huan, YANG Da Chem. J. Chinese Universities    2021, 42 (10): 3024-3039.   DOI: 10.7503/cjcu20210367 Abstract （1457）   HTML （49）    PDF（pc） （2518KB）（439）       Knowledge map    Save Carbonylation of unsaturated hydrocarbons refers to the insertion of carbon monoxide（CO） into olefins（or alkynes） and different nucleophiles in the form of carbonyl group， which higher value-added chemicals are synthesized in the presence of transition metal catalysts. In this paper， the importance of carbonylation reaction in the synthesis of high value-added chemicals was briefly introduced：（1） the synthetic route was simple and the target products could be synthesized in one step with high yield；（2） the starting materials of carbonylation reaction were cheap and various， such as natural fossil oils， petrochemical and coal chemical products etc.（3） Because the raw materials were cheap and the products were more useful， the economic benefit was considerable. Then the application of several different types of carbonylation reactions（hydroformylation， hydroesterification， aminocarbonylation， hydrocarboxylation） in the development of new catalyst systems and efficient synthesis of target products were introduced. A variety of high value-added products like aldehyde， ester， amide or carboxylic acid were synthesized with high regio/chemoselectivity. Finally， the existing problems of carbonylation reaction and the future development direction and trend were prospected： （1） the application of cheap metal catalysts in carbonylation reaction； （2） developing more carbonylative substitutes on the basis of existing carbon monoxide surrogates； （3） carbonylation of some special olefins（1，3-dienes） to synthesize target compounds with high efficiency and regio/chemoselectivity； （4） explore the mechanism of carbonylation reaction process etc. It is expected to achieve the goal of green， cheap and recyclable carbonylation to produce high value-added carbonylative chemicals with high efficiency and selectivity. ? Supported by the National Natural Science Foundation of China（No.21901250） and the General Programs of China Postdoctoral Science Foundation（No.2019M651625）. Table and Figures | Reference | Related Articles | Metrics

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Challenges and Recent Progress of Prelithiation for Si-Based Anodes in Lithium-ion Batteries LI Shiheng, WANG Chao, LU Zhenda Chem. J. Chinese Universities    2021, 42 (5): 1530-1542.   DOI: 10.7503/cjcu20200503 Abstract （1444）   HTML （58）    PDF（pc） （14978KB）（1028）       Knowledge map    Save Secondary lithium-ion battery（LIB） plays an important role in our daily life， however， state-of- the-art LIBs cannot meet the high-energy-density demand of electric vehicles and large-scale gird， developing high-capacity electrode materials is a must. Recently， Si anode has attracted much attention due to its high theoretical specific capacity， low electrochemical potential， and abundance in the earth’s crust， but the large volume change（ca. 300%） during cycling and low initial Coulombic efficiency（ICE） severely hinder its practical applications. Prelithiation as a promising strategy has been proven effective to improve the ICE for high- performance Si-based anodes. This review focuses on demonstrating the scientific significance of prelithiation， systemically introducing various methods of prelithiation by recent advances and analyzing their own advan- tages and disadvantages， and finally proposing the challenges and prospects of the prelithiation of Si-based anodes. Table and Figures | Reference | Related Articles | Metrics

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Visible Light-driven Carboxylation with CO2 ZHANG Zhen, DENG Yu, ZHANG Qinfang, YU Dagang Chem. J. Chinese Universities    2022, 43 (7): 20220255-.   DOI: 10.7503/cjcu20220255 Abstract （1422）   HTML （79）    PDF（pc） （11197KB）（977）       Knowledge map    Save Carbon dioxide（CO2） is not only a well-known greenhouse gas but also one important C1 resource. It is very important to realize organic transformations with CO2 to generate high value-added compounds. Given the importance of carboxylic acid and derivatives which are widely found in natural products， medicines， daily chemicals and industrial raw materials， the synthesis of carboxylic acids with CO2 has become an important research direction. On the other hand， high temperature and other harsh conditions are always required in this field due to the low reactivity of CO2. To solve such problems， visible light is used as an clean energy source to drive the effective transformations of CO2， which has been developed significantly in last few years. This review mainly introduced and summarized the visible light-driven carboxylation with CO2 in recent years， and classified them according to types of important chemical raw materials， such as alkenes， alkynes， aldehydes and ketones， imines organo（pseudo）halides and others. The characteristics and mechanisms of each reaction were discussed. In addition， this review also provided perspective to this emerging field. Reference | Related Articles | Metrics

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Research Progress of Flexible Tactile Sensors Applied to Wearable Electronics PAN Xiaojun, BAO Rongrong, PAN Caofeng Chem. J. Chinese Universities    2021, 42 (8): 2359-2373.   DOI: 10.7503/cjcu20210012 Abstract （1404）   HTML （84）    PDF（pc） （23620KB）（1177）       Knowledge map    Save The flexible tactile sensor is a type of device that imitates the human tactile. It can get the information and data of the human body and the external environment. The application in medical detection and intelligent robots provides a broad prospect. Recently， many researches have greatly improved the performance of flexible tactile sensors. In the first part of this review， the structure and basic performance of flexible tactile sensors is introduced. In the second part， we discuss a new type of tactile sensor with self-healing， self-driving and visualization. The third part discusses the application of flexible tactile sensors in wearable electronic technology， medical care and human-computer interaction interface. The final part of the article discusses the challenges that flexible tactile sensors will face in the future. Table and Figures | Reference | Related Articles | Metrics

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Facile Synthesis and Properties of Robust and Anti-swelling Hydrogels LUO Chunhui, ZHAO Yufei Chem. J. Chinese Universities    2021, 42 (6): 2024-2033.   DOI: 10.7503/cjcu20200722 Abstract （1369）   HTML （39）    PDF（pc） （4476KB）（561）       Knowledge map    Save Robust and anti-swelling hydrogels based on commercial available polyvinyl alcohol（PVA） and chitosan（CS） were prepared via freezing-thawing cycle to prepare the precursor PVA-CS hydrogel firstly， followed by soaking in sodium chloride aqueous solution and dialysis against water to obtain the resultant PVA-CS-6.16-30 hydrogel. The microstructures of the two hydrogels were characterized， and their mechanical pro-perties were evaluated. Due to the multiple interactions of hydrogen bonding， crystalline region and chain entanglement， the obtained PVA-CS-6.16-30 hydrogel dissipated external energy more effectively. Compared with the precursor PVA-CS hydrogel， the free water content and mesh size of the resultant hydrogel declined from 62.8% and 6.11 to 52.6% and 5.21 nm， respectively. In contrast， the gel fraction， cross-linking density and crystalline degree of PVA increased from 58.6%， 7.69×10-4 and 14.8% to 86.8%， 9.97×10-4 mol/cm3 and 17.2%， respectively. Benefited from the higher cross-linking density and more homogeneous gel framework， the tensile strength， elongation at break， toughness as well as compressive stress of the resultant hydrogel increased to 2.9 MPa， 229%， 3.3 MJ/m3 and 7.6 MPa， respectively. Furthermore， it exhibited excellent anti-swelling and creep-resistant abilities. The resultant hydrogel maintained its original shapes and mechanical properties（tensile and compressive strength were 2.8 and 7.5 MPa， respectively） even after soaking in PBS aqueous solution for 7 d at 37 ℃. We hope that the full-fledged starting material， easy-operated process and balanced properties of the resultant hydrogel will promote the development of tissue engineering and biomedical materials for commercial applications. Table and Figures | Reference | Supplementary Material | Related Articles | Metrics

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Progress of Graphene Oxide/Polymer Composite Hydrogel LI Peihong, ZHANG Chunling, DAI Xueyan, SUI Yanlong Chem. J. Chinese Universities    2021, 42 (6): 1694-1703.   DOI: 10.7503/cjcu20200869 Abstract （1326）   HTML （59）    PDF（pc） （6667KB）（808）       Knowledge map    Save Graphene oxide（GO） is a popular two-dimensional material with excellent mechanical properties， good water dispersibility， non-toxicity， and good biocompatibility， and its surface has a large number of oxygen-containing functional groups. Therefore， GO is an ideal hydrogel raw material. Hydrogel is a multi- element system with a three-dimensional network structure and water as the filling medium. The introduction of GO into the hydrogel system can improve the mechanical properties of the hydrogel and enrich its stimulus response types. At present， GO hydrogel has excellent performance in many fields such as high strength， adsorption， self-healing materials and sensors， and has become one of the research hotspots. The research of GO hydrogel has a history of ten years. In this review， the preparation methods of GO hydrogels are summarized， including acidification and the addition of polymers， small organic molecules or ions as crosslinking agents. Among them， GO/polymer composite hydrogels prepared by physical mixing and chemical crosslinking and polymerization methods are the most common. The response mechanism and research progress of smart GO hydrogels are summarized in terms of photo-thermal response， pH response and self-healing. The application prospects of GO hydrogels in high strength hydrogels， biomedicine science， smart materials and sewage treatment are reviewed. Table and Figures | Reference | Related Articles | Metrics

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Research Progress on Improving the Binding Affinity of Aptamers through Chemical Modification LIU Ke, JIN Yu, LIANG Jiangong, WU Yuan Chem. J. Chinese Universities    2021, 42 (11): 3477-3492.   DOI: 10.7503/cjcu20210292 Abstract （1316）   HTML （73）    PDF（pc） （2381KB）（452）       Knowledge map    Save Aptamers are short single-stranded DNA or RNA oligonucleotides obtained through in vitro systematic evolution of ligands by exponential enrichment（SELEX）. They possess high specificity and high affinity equivalent to or better than those of antibody. Moreover， they have been studied widely in food， environment， and biomedical fields due to many other advantages， such as wide range of targets， easy preparation， flexible and controllable modification， low immunogenicity， small batch variation， and easy storage. But so far， commercial applications of aptamers are still limited. Researchers have conducted numerous chemical modifications to enhance the performance of aptamers. This review focused on the non-covalent or covalent chemical modification of aptamers pre- and post-SELEX to increase the binding affinity of aptamer towards the target. It systematically summarized the research progress of chemical modification of aptamers in recent years and discussed the prospective of the future development. Table and Figures | Reference | Related Articles | Metrics

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Advances in Silicon and Silicon-based Anode Materials HAN Muyao, ZHAO Lina, SUN Jie Chem. J. Chinese Universities    2021, 42 (12): 3547-3560.   DOI: 10.7503/cjcu20210639 Abstract （1309）   HTML （78）    PDF（pc） （1886KB）（814）       Knowledge map    Save Silicon（Si） has high theoretical capacity， low voltage platform and abundant natural resources， which has the potential to become the next generation high energy density lithium ion batteries anode material. However， Si has low inherent conductivity and great volume change in the cycle process， which is different from graphite and should not be directly used as an anode material. Therefore， many modification strategies have been developed to improve or adapt to Si based anode materials from dimension structure， composites， binders and electrolytes， so as to meet the requirements of commercialization. In this paper， the research pro-gress of Si based anode materials in recent years was reviewed， the design elements of different aspects were summarized， and the performance of representative materials was introduced. Finally， the problems faced by Si based anode materials were briefly analyzed， and the research prospect of Si based anode materials as lithium ion batteries was forecasted. Table and Figures | Reference | Related Articles | Metrics

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Advanced 3D Current Collectors for Dendrite-free Lithium Metal Anode LI Tong, GU Sichen, LIN Qiaowei, HAN Junwei, ZHOU Guangmin, LI Baohua, KANG Feiyu, LYU Wei Chem. J. Chinese Universities    2021, 42 (5): 1480-1500.   DOI: 10.7503/cjcu20200678 Abstract （1296）   HTML （36）    PDF（pc） （26321KB）（699）       Knowledge map    Save Nowadays， with the rapid development of electrochemical energy storage market， the present commercial lithium ion batteries cannot meet the growing demand for energy storage devices with higher energy density. Metallic lithium is strongly regarded as the most promising anode candidate for next-generation high-energy-density batteries， due to its superior theoretical capacity and low electrochemical potential. However， there are still several determent issues to be addressed during charging and discharging， including huge volume change， lithium dendrite growth and unstable interface， which seriously hinder its practical application in secondary batteries. Three-dimensional（3D） porous matrixes are considered as ideal current collectors to realize a uniform Li nucleation and dendrite-free Li plating as well as to overcome volume expansion simultaneously. 3D current collectors possess spacial framework， large surface area， abundant pores and high mechanical properties， which enable a lower local current density， uniform electric field distribution and reduced concentration gradient for lithium anode during Li plating/stripping. Although many research papers related to 3D current collectors have been published recently， few comprehensive and systemic evaluation was revealed on the currently various 3D current collector systems. This review focuses on the research progress referring to structure design and practical application of 3D current collectors in lithium anode. Firstly， an analysis about the principle and limitation of lithium dendrite suppression by 3D current collector is provided. Secondly， we pay close attention to strategies for controllable construction， surface modification and functio-nality of a 3D structure and resulting improvement of Li deposition. A comparison among various 3D hosts based on different materials is summarized， in terms of advantages and shortages. Finally， perspectives of the future research based on the practical application in this field are discussed. Table and Figures | Reference | Related Articles | Metrics

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Fast Synthesis of Highly Luminescent Two-dimensional Tin-halide Perovskites by Anti-solvent Method LIU Yao, DENG Zhengtao Chem. J. Chinese Universities    2021, 42 (12): 3774-3782.   DOI: 10.7503/cjcu20210358 Abstract （1238）   HTML （36）    PDF（pc） （2075KB）（311）       Knowledge map    Save In recent years， lead halide perovskites have attracted extensive attention due to their remarkable optoelectronic properties. However， the toxicity of lead in materials has greatly hindered their large-scale commercial applications. Therefore， it is very important to find lead-free halide perovskite materials with similar photoelectric properties as lead halide perovskite materials. Among the lead-free halide perovskites， tin-halide perovskite is considered as one of the best substitutes for lead based perovskite materials. Herein， a series of novel two-dimensional（2D） （RNH3）2SnX4（R is alkyl chain， X=Br-， I-） perovskite materials was synthesized by a simple antisolvent method， which have excellent fluorescence emission properties with photoluminescence quantum yield（PLQY） up to 98%. It was found that the prepared materials are more stable than 3D ASnX3-type［A=Cs+， methylammonium（MA+）， formamidinium（FA+）］ ones. This work lays a foundation for the industrial application of metal halide perovskite materials in solid-state lighting devices and display devices. Table and Figures | Reference | Related Articles | Metrics

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Applications of Low Temperature Plasma for the Materials in Li-ion Batteries SHI Ying, HU Guangjian, WU Minjie, LI Feng Chem. J. Chinese Universities    2021, 42 (5): 1315-1330.   DOI: 10.7503/cjcu20200675 Abstract （1166）   HTML （83）    PDF（pc） （12647KB）（1161）       Knowledge map    Save With the increasing demands for the Li-ion batteries with high energy and power density， high safety， and long cycle life， the development of high-performance materials through proper structure design and surface functionalization is of great importance. To realize the high performance of materials for Li-ion batteries， advanced processing methods with high efficiency， low cost and simplicity are quite necessary， especially for material synthesis and surface modification. As a simple， fast， high efficiency， and eco-friendly processing technology in the synthesis of nanomaterials， low temperature plasma has been widely explored in the development of materials in Li-ion batteries during recent years and shown great potential for practical applications. This paper reviews the basic principle and common technologies of low temperature plasma， as well as the progress of the applications of plasma in the Li-ion batteries. The applications of low temperature plasma for the material synthesis and surface modification of the essential components of Li-ion batteries， including anodes， cathodes， separators and solid-state electrolytes， are mainly focused on. For the material synthesis， plasma can accelerate the crystal growth， reduce the reaction temperature， and obtain uniform nanostructure by avoiding agglomeration during the growth of particles. Assisting deposition of films and making dense solid-state electrolytes with less contamination are also the merits of low temperature plasma in material synthesis. For the surface modification， plasma can improve the surface properties by in situ coating， etching， and doping with proper atmosphere and functionalize the surface by graft polymerization and the formation of radicals or functional groups. At the same time， surface cleanliness， polarity and wettability can also be changed by plasma processing. These unique characteristics of plasma and the advantages on the applications for Li-ion batteries are thoroughly discussed in this review. In addition， the challenges and directions for future research of the plasma are also prospected. Table and Figures | Reference | Related Articles | Metrics