化工学报2017，Vol.68Issue(11)：4376-4382,7.DOI:10.11949/j.issn.0438-1157.20170340
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
摘要
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.关键词
活化/制备/生物质多孔碳/电化学性能/锂硫电池Key words
activation/preparation/biomass-based porous carbon/electrochemical performance/lithium-sulfur batteries分类
数理科学引用本文复制引用
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):4376-4382,7.基金项目
国家国际科技合作专项项目(2015DFR50350) （2015DFR50350）
陕西省科技计划项目( 2017GY-160 ) （ 2017GY-160 ）
陕西省自然科学基础研究计划项目(2017JQ5055) （2017JQ5055）
西安理工大学科技创新项目(2015CX011,2015CX002). 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). （2015CX011,2015CX002）
