孔道有序排列高容量S@C复合电极材料的制备及电化学性能

doi:10.7503/cjcu20200055

高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (6): 1306.doi: 10.7503/cjcu20200055

孔道有序排列高容量S@C复合电极材料的制备及电化学性能

白延群^1,²,王存国^1,^*(),李雪¹,樊文琪¹,宋鹏豪¹,顾圆春²,刘法谦³,刘光烨²

^1. 青岛科技大学橡塑材料与工程教育部重点实验室, 山东省橡塑材料与工程重点实验室, 青岛 266042
^2. 青岛科技大学高性能聚合物及成型技术教育部工程研究中心, 青岛 266042
^3. 中山大学化学工程与技术学院, 珠海 519082

收稿日期:2020-01-31 出版日期:2020-06-10 发布日期:2020-05-20
通讯作者: 王存国 E-mail:wangcg@qust.edu.cn
基金资助:
山东省教育厅基金(sdyjg19089)

Preparation and Electrochemical Properties of S@C Composite Material with High Capacity and Ordered Alignment of Channels ^†

BAI Yanqun^1,²,WANG Cunguo^1,^*(),LI Xue¹,FAN Wenqi¹,SONG Penghao¹,GU Yuanchun²,LIU Faqian³,LIU Guangye²

^1. Key Laboratory of Rubber-plastics, Ministry of Education, Shandong Province Key Lab of Rubber-plastics, Qingdao University of Science and Technology, Qingdao 266042, China
^2. Engineering Research Center for High Performance Polymer and Molding Technology, Ministry of Education, Qingdao University of Science and Technology, Qingdao 266042, China
^3. School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China

Received:2020-01-31 Online:2020-06-10 Published:2020-05-20
Contact: Cunguo WANG E-mail:wangcg@qust.edu.cn
Supported by:
† Supported by the Foundation of Education Department of Shandong Province, China(sdyjg19089)

摘要/Abstract

摘要：

用氨水对木材进行预处理, 去除其中的木质素, 再经过高温碳化和活化处理, 得到孔道有序排列的多级孔径三维碳材料, 于150 ℃下熔融吸附硫, 得到高容量 S@C复合电极材料. 扫描电子显微镜(SEM)、 X射线衍射(XRD)、拉曼光谱及表面吸附实验等测试结果表明, 该碳材料呈现各向异性多级孔径的三维结构, 孔道与树干生长方向平行有序排列; 经过KOH活化后的碳材料孔道内壁上出现较多微孔, 从而具有较大的孔容和比表面积. 以S@C复合材料作正极组装了锂/硫电池, 电化学性能测试结果表明, 电池首次放电比容量达1595 mA·h/g, 接近于硫电极材料的理论比容量1670 mA·h/g.

关键词: 锂/硫电池, 硫, 木炭, 碳基复合材料, 电化学性能, 热处理

Abstract:

The wood was pretreated with ammonia to remove the lignin from the wood, then heated under the protection of inert gas and activated by KOH, the three-dimensional(3D) carbon material with ordered alignment of channels and multi-pores was obtained. After melting and absorbing sulfur in a autoclave at 150 ℃, a kind of S@C composite electrode material with high capacity was prepared. The composite was characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD), Raman spectroscopy and N₂ adsorption-desorption analysis. The results show that the carbon material has a 3D structure with anisotropic channels and multi-level pores. The channels are arranged orderly in parallel with the growth direction of the tree trunk. In addition, there are many micropores on the inner wall of the carbon material activated by KOH. So the material has high pore volume and specific surface area. Furthermore, the Li/S battery was assembled by using S@C composite as cathode material. The electrochemical results show that the first discharge capacity of the S@C composite electrode material reaches 1595 mA·h /g, which is close to the theoretical specific capacity of sulfur electrode material(1670 mA·h/g).

Key words: Lithium/sulfur battery, Sulfur, Wood carbon, Carbon based composite, Electrochemical property, Heat treatment

中图分类号:

O646
TQ152

TrendMD:

白延群,王存国,李雪,樊文琪,宋鹏豪,顾圆春,刘法谦,刘光烨. 孔道有序排列高容量S@C复合电极材料的制备及电化学性能. 高等学校化学学报, 2020, 41(6): 1306.

BAI Yanqun,WANG Cunguo,LI Xue,FAN Wenqi,SONG Penghao,GU Yuanchun,LIU Faqian,LIU Guangye. Preparation and Electrochemical Properties of S@C Composite Material with High Capacity and Ordered Alignment of Channels ^†. Chem. J. Chinese Universities, 2020, 41(6): 1306.

图/表 9

Fig.1 SEM images of wood carbon material after heat-treatment at high temperature and KOH activation (A) The upper surface; (B) the lateral surface; (C) the pore wall; (D) the high magnification image of the framed area in (C); (E) the high magnification image of the framed area in (D).

Fig.2 N2 adsoprtion-desorption isotherm(A) and pore diameter distribution(B) of wood carbon material

Fig.3 XRD patterns of sulfur(a), wood carbon(b) and S@C composite(c)

Fig.4 Raman spectra of sulfur(a), wood carbon(b) and S@C composite(c)

Fig.5 Nyquist plots of S@C composite electrode

Fig.6 CV curves of S@C composite electrode at a scan rate of 0.02 mV/s

Fig.7 Change of areal specific capacity with the areal mass loading of sulfur at 0.1C

Fig.8 Charge-discharge curves of S@C composite electrode material Charge-discharge rate: 0.1C.

Fig.9 Rate performance of S@C composite electrode material

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孔道有序排列高容量S@C复合电极材料的制备及电化学性能

Preparation and Electrochemical Properties of S@C Composite Material with High Capacity and Ordered Alignment of Channels ^†

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孔道有序排列高容量S@C复合电极材料的制备及电化学性能

Preparation and Electrochemical Properties of S@C Composite Material with High Capacity and Ordered Alignment of Channels †

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Preparation and Electrochemical Properties of S@C Composite Material with High Capacity and Ordered Alignment of Channels ^†