不同粘结剂对锂-硫电池电化学性能的影响  

Influence of different binder materials on the performance of lithium-sulfur batteries

作　　者：李林艳[1] 崔晓兰[1] 单忠强[1] 田建华[1] 刘肖燕[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《功能材料》2014年第11期11087-11090,共4页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2013AA050901)

摘　　要：采用球磨混合及热复合法制备硫/BP2000复合正极材料(含硫量42%(质量分数)),分别以PTFE、明胶和PEO作为粘结剂,考察了不同粘结剂对锂-硫电池电化学性能的影响。采用热重分析(TGA)、X射线衍射(XRD)、循环伏安法(CV)和恒流充放电表征其物化性能和电化学性能。结果表明,明胶和PTFE对于提高硫正极的电化学性能和维持硫正极的循环稳定性具有积极意义。其中,在0.2 C充放电时,PTFE作粘结剂的电池循环50次后比容量保持741.2 mAh/g,明胶作粘结剂的电池循环50次后放电比容量保持788 mAh/g(按单质硫的质量计算)。Ball milling in combination with heat treatment was used to prepare S /C composite cathode materials（ sulfur containing was 42wt%）. In this paper,the effects of different binders PTFE,gelatin and PEO for lithium-sulfur battery were studied respectively. Cyclic voltammetry（ CV） and constant current charge-discharge characterized the electrochemical properties. The results showed that gelatin and PTFE as a binder presented positive evaluations for the electrochemical performance of sulfur positive electrode. In the experiment,the discharge capacity retains 741. 2 mAh /g（ based on sulfur weight） after 50 for PTFE at 0.2 C. Gelatin as a binder,the discharge capacity was 788 mAh/g after the 50 cycle for the cycles at the current of 0. 2 C.

关 键 词：锂硫电池 硫正极 粘结剂 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动] TM912.9