无粘结剂三维石墨烯-硫正极的电化学性能研究

材料科学与工艺, 2014, (3): 7-10.

无粘结剂三维石墨烯-硫正极的电化学性能研究

卢松涛 ^1, , 王志达 ^2, , 陈艳 ^3, , 吴晓宏 ^4,

1.哈尔滨工业大学化学系，哈尔滨150001

2.哈尔滨工业大学化学系，哈尔滨150001

3.哈尔滨工业大学化学系，哈尔滨150001

4.哈尔滨工业大学化学系，哈尔滨150001

基金项目: 国家自然科学基金资助项目(51078101；51173033)；哈尔滨工业大学基础研究杰出人才＂跃升＂培育计划资助项目(HIT．BRETIII．201224，201312)．

关键词：锂硫电池 , 三维石墨烯 , 无粘结剂 , 正极材料 , 电化学性能

Electrochemical properties of binder-free three-dimensional graphene-sulfur cathodes

Keywords： lithium-sulfur batteries , 3D graphene , binder-free , cathode materials , electrochemical properties

为提高电极中硫的负载量，采用水热法和热处理法制备了锂硫电池用无粘结剂三维石墨烯-硫正极材料，用比表面积测试仪、电子扫描电镜、电化学工作站以及电池测试系统对电极的比表面积、微观表面形貌和电化学性能进行了表征．结果表明：所制备的无粘结剂三维石墨烯-硫电极的最高放电比容量为517．3 mAh/g，50次循环后，放电比容量仍能保持在448．9 mAh/g，表现出较高的比容量和良好的循环性能．

In order to increase the mass loading of sulfur, binder-free 3D graphene-sulfur (3D-GS) cathode for lithium-sulfur batteries was prepared using hydrothermal and heat treatment methods. The specific surface area, microstructure, morphology and electrochemical properties were characterized by specific surface area analyzer, scanning electron microscope, electrochemical workstation and battery test system. As a result, the as-prepared binder-free 3D-GS cathode could deliver a high specific capacity of 517.3 mAh/g, and can maintain 448.9 mAh/g after 50 charge-discharge cycles, showing high specific capacity and well cycle stability.

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