纳米Al2O3包覆富锂锰基正极材料Li1.2Ni0.13Co0.13Mn0.54O2的性能研究

doi:10.7503/cjcu20190719

高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (6): 1329.doi: 10.7503/cjcu20190719

纳米Al₂O₃包覆富锂锰基正极材料Li_1.2Ni_0.13Co_0.13Mn_0.54O₂的性能研究

陈良丹¹,邹伟¹,吴亮¹,夏凡杰^1,²,胡执一^1,²,李昱^1,^2,^*(),苏宝连^1,^3,^*()

^1. 武汉理工大学材料复合新技术国家重点实验室, 武汉 430070
^2. 武汉理工大学微纳结构研究中心, 武汉 430070
^3. 那慕尔大学无机材料化学实验室, 那慕尔 B-5000

收稿日期:2019-12-31 出版日期:2020-06-10 发布日期:2020-03-06
通讯作者: 李昱,苏宝连 E-mail:yu.li@whut.edu.cn;bao-lian.su@unamur.be
基金资助:
国家自然科学基金(U1663225);国家重点研发计划项目(2016YFA0202602)

Nano-Al₂O₃ Coated Li-rich Cathode Material Li_{1. 2}Ni_0.13Co_0.13Mn_0.54O₂ for Highly Improved Lithium-ion Batteries ^†

CHEN Liangdan¹,ZOU Wei¹,WU Liang¹,XIA Fanjie^1,²,HU Zhiyi^1,²,LI Yu^1,^2,^*(),SU Baolian^1,^3,^*()

^1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
^2. Nanostructure Research Centre(NRC), Wuhan University of Technology, Wuhan 430070, China
^3. Laboratory of Inorganic Materials Chemistry(CMI), University of Namur, Namur B-5000, Belgium

Received:2019-12-31 Online:2020-06-10 Published:2020-03-06
Contact: Yu LI,Baolian SU E-mail:yu.li@whut.edu.cn;bao-lian.su@unamur.be
Supported by:
† National Natural Science Foundation of China(U1663225);National Key Research and Development Program of China(2016YFA0202602)

摘要/Abstract

摘要：

采用纳米三氧化二铝(Al₂O₃)对富锂锰基正极材料Li_1.2Ni_0.13Co_0.13Mn_0.54O₂进行表面均匀包覆, 并考察了最优纳米Al₂O₃包覆量下材料的电化学性能. 扫描电子显微镜(SEM)和透射电子显微镜(TEM)显示了纳米Al₂O₃对富锂锰基正极材料表面均匀包覆, X射线衍射分析(XRD)结果表明包覆后富锂材料依然具有良好的层状结构. 恒流充/放电循环测试发现, 包覆后的Li_1.2Ni_0.13Co_0.13Mn_0.54O₂材料的首次放电比容量为249.7 mA·h/g, 循环100次后的容量保持率为89.5%, 与未包覆的Li_1.2Ni_0.13Co_0.13Mn_0.54O₂材料相比, 容量保持率提升约13%. 循环伏安(CV)和电化学阻抗(EIS)测试结果表明, 纳米Al₂O₃包覆可有效抑制材料极化, 降低界面阻抗和电荷转移阻抗, 进而提升富锂锰基正极材料的电化学性能.

关键词: 锂离子电池, Li_1.2Ni_0.13Co_0.13Mn_0.54O₂, 纳米三氧化二铝, 表面改性

Abstract:

The lithium-rich cathode material Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ were coated uniformly by nano-Al₂O₃ for highly stable lithium-ion batteries. The optimum content of nano-Al₂O₃ coating on the structure, surface morphology and electrochemical properties were systematically studied by X-ray diffraction(XRD), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). SEM and TEM results show that the surface of the lithium-rich cathode material is evenly coated with nano-Al₂O₃. XRD results show that the as-synthesized materials have a layered structure. Electrochemical test results show that the nano-Al₂O₃ coating is beneficial to improving the discharge specific capacity, rate performance and cycle stability. The nano-Al₂O₃ coated Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ material has a specific discharge capacity of 249. 7 mA·h/g with excellent cycling stability(89.5% capacity retention after 100 cycles). Cyclic voltammetry(CV) and electrochemical impedance(EIS) results show that nano-Al₂O₃ coating can effectively inhibit the erosion of HF, reduce electrode material/electrolyte interface side-reactions, decrease polarization, reduce interface impedance and charge transfer impedance. This work suggests that the nano-Al₂O₃ coating is an effective route to significantly improve the electrochemical performance of lithium-rich cathode materials.

Key words: Lithium-ion battery, Li_{1. 2}Ni_0.13Co_0.13Mn_0.54O₂, Nanometer aluminum trioxide, Surface modification

中图分类号:

O646

TrendMD:

陈良丹,邹伟,吴亮,夏凡杰,胡执一,李昱,苏宝连. 纳米Al₂O₃包覆富锂锰基正极材料Li_1.2Ni_0.13Co_0.13Mn_0.54O₂的性能研究. 高等学校化学学报, 2020, 41(6): 1329.

CHEN Liangdan,ZOU Wei,WU Liang,XIA Fanjie,HU Zhiyi,LI Yu,SU Baolian. Nano-Al₂O₃ Coated Li-rich Cathode Material Li_{1. 2}Ni_0.13Co_0.13Mn_0.54O₂ for Highly Improved Lithium-ion Batteries ^†. Chem. J. Chinese Universities, 2020, 41(6): 1329.

图/表 9

Fig.1 The first cycle discharge curves of LNCM and LNCM@Al2O3 prepared with different amounts of C9H21AlO3

Fig.2 XRD patterns of LNCM(a) and LNCM@Al2O3(b)

Fig.3 SEM images of LNCM(A) and LNCM@Al2O3(B)

Fig.4 HAADF-STEM image at low magnification(A), the corresponding EDS maps of Co(B), Mn(C),Ni(D) and Al(E) and EDS pattern from the area of (A)(F) of LNCM@Al2O3

Fig.5 Charge-discharge curves of LNCM(A), LNCM@Al2O3(B) and cycle performance of LNCM and LNCM@Al2O3 at 0.5C after three cycles at 0.1C(C) and rate capability of LNCM and LNCM@Al2O3(D)

Fig.6 CV curves of LNCM(A) and LNCM@Al2O3(B)

Fig.7 Nyquist plots of LNCM and LNCM@Al2O3 after 50 cycles at 0.2C

Fig.8 SEM images after 50 cycles at 0.2C of LNCM(A), LNCM@Al2O3(B) and SEM image at high magnification(C) and the corresponding EDS mapping of Al(D) of LNCM@Al2O3

Fig.9 Schematic diagram of reaction of LNCM(A) and LNCM@Al2O3(B) in electrolyte

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纳米Al₂O₃包覆富锂锰基正极材料Li_1.2Ni_0.13Co_0.13Mn_0.54O₂的性能研究

Nano-Al₂O₃ Coated Li-rich Cathode Material Li_{1. 2}Ni_0.13Co_0.13Mn_0.54O₂ for Highly Improved Lithium-ion Batteries ^†

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