锂硫电池用玉米苞叶基活性炭/硫复合正极材料的电化学性能

doi:10.11949/j.issn.0438-1157.20170340

化工学报 ›› 2017, Vol. 68 ›› Issue (11): 4376-4382.DOI: 10.11949/j.issn.0438-1157.20170340

• 材料化学工程与纳米技术 • 上一篇下一篇

锂硫电池用玉米苞叶基活性炭/硫复合正极材料的电化学性能

李巧乐¹, 燕映霖¹, 杨蓉², 陈利萍¹, 秦海超¹, 史忙忙¹, 魏一奇¹

1 西安理工大学材料科学与工程学院, 陕西西安 710048;
2 西安理工大学理学院, 陕西西安 710048

收稿日期:2017-03-31 修回日期:2017-08-02 出版日期:2017-11-05 发布日期:2017-11-05
通讯作者: 燕映霖
基金资助:
国家国际科技合作专项项目（2015DFR50350）；陕西省科技计划项目（2017GY-160）；陕西省自然科学基础研究计划项目（2017JQ5055）；西安理工大学科技创新项目（2015CX011，2015CX002）。

Electrochemical performance of activated carbon derived from corn bracts/sulfur composite cathode material for lithium-sulfur batteries

LI Qiaole¹, YAN Yinglin¹, YANG Rong², CHEN Liping¹, QIN Haichao¹, SHI Mangmang¹, WEI Yiqi¹

1 School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi, China;
2 School of Science, Xi'an University of Technology, Xi'an 710048, Shaanxi, China

Received:2017-03-31 Revised:2017-08-02 Online:2017-11-05 Published:2017-11-05
Supported by:
supported by the International Science Technology Cooperation Program of China (2015DFR50350), the Science and Technology Project of Shaanxi Province (2017GY160), the Basic Research Plan of Natural Science Funded by Shaanxi Science and Technology Department (2017JQ5055) and the Innovation Project of Xi'an University of Technology (2015CX011, 2015CX002).

摘要/Abstract

摘要：

锂硫电池因具有超高的理论比容量（1675 mA·h·g^-1）而被认为是最具有应用前景的二次电池。但硫基正极面临着硫导电性差、利用率低、正极结构稳定性差等问题。采用KOH化学活化法将廉价易得的农业废弃物玉米苞叶制备为多孔碳材料后，与升华硫复合获得硫/碳复合材料。利用XRD、SEM、TEM和BET对该硫/碳复合材料的微观结构、形貌等进行表征发现，玉米苞叶制备的多孔碳材料具有类石墨烯片层结构，且表面具有大量的介孔结构，硫元素均匀分布在多孔碳材料中。采用恒流充放电和交流阻抗法对该复合材料正极电化学性能进行测试发现其具有较高的放电比容量和良好的循环性能，这是由于类石墨烯片层结构的多孔碳材料提高了硫正极的导电性，且其极大的比表面积大幅增加了电化学反应位点，提高了硫的利用率。

关键词: 活化, 制备, 生物质多孔碳, 电化学性能, 锂硫电池

Abstract:

Lithium sulfur batteries are considered to be the most promising secondary battery because of its high theoretical specific capacity (1675 mA·h·g^-1). However, the sulfur cathode faces the challenges, such as poor conductivity, low utilization of sulfur and poor structure stability of cathode. Biomass-based porous carbon, with cheap and accessible agricultural waste corn bracts as raw material, was prepared by chemical activation with KOH, and then composited with sublimate sulfur through modelling-fused method to form sulfur/carbon composite. The microscopic structure and morphology of the composites were characterized by XRD, SEM, TEM, and BET. The results show that the biomass-based porous carbon material possesses lamellar structure, which is similar to graphene, and abundant mesoporous structure on the surface of carbon. Furthermore, sulfur particles homogeneously distribute in the carbon conductive network. In addition, the electrochemical properties were studied by galvanostatic charge-discharge tests and electrochemical impedance spectroscopy. The results show that the battery possesses high discharge capacity and good cycle-life performance. The main reasons are as follow:the porous carbon structure like graphene, enhancing conductivity of sulfur cathode; the huge specific surface area which make electrochemical reaction sites increased, improving the utilization of sulfur.

Key words: activation, preparation, biomass-based porous carbon, electrochemical performance, lithium-sulfur batteries

中图分类号:

O46
TB34

李巧乐, 燕映霖, 杨蓉, 陈利萍, 秦海超, 史忙忙, 魏一奇. 锂硫电池用玉米苞叶基活性炭/硫复合正极材料的电化学性能[J]. 化工学报, 2017, 68(11): 4376-4382.

LI Qiaole, YAN Yinglin, YANG Rong, CHEN Liping, QIN Haichao, SHI Mangmang, WEI Yiqi. Electrochemical performance of activated carbon derived from corn bracts/sulfur composite cathode material for lithium-sulfur batteries[J]. CIESC Journal, 2017, 68(11): 4376-4382.

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锂硫电池用玉米苞叶基活性炭/硫复合正极材料的电化学性能

Electrochemical performance of activated carbon derived from corn bracts/sulfur composite cathode material for lithium-sulfur batteries

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