聚苯胺/硫复合材料作锂二次电池正极的研究  

Polyaniline/sulfur composite as cathode for secondary lithium battery

作　　者：马萍[1] 张宝宏[1] 巩桂英[1] 徐宇虹[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001

出　　处：《功能材料与器件学报》2007年第5期437-442,共6页Journal of Functional Materials and Devices

基　　金：哈尔滨工程大学基础研究基金(No.HEUF04064)

摘　　要：采用在化学氧化聚合苯胺的反应介质中分散单质硫的方法制备了聚苯胺/硫复合材料,借助扫描电镜对样品的微观形貌进行表征,表明苯胺的聚合倾向于在单质硫颗粒表面进行,形成聚苯胺包覆良好的硫复合材料。通过恒电流充放电、循环伏安、电化学交流阻抗等电化学测试研究了聚苯胺原位包覆对硫电极电化学性能的影响。结果得出,聚苯胺对硫的包覆能显著地改善硫电极的电化学性能,当充放电电流密度为0.2 mA/cm2时,初始放电比容量高达1134.01 mAh/g,循环30次后放电比容量仍可达526.89 mAh/g。电化学交流阻抗谱研究表明,聚苯胺的包覆有助于锂硫电池交流阻抗的降低。Polyaniline/Sulfur composite was synthesized by the in-situ polymerization,when aniline was polymerized through chemical oxidative polymerization with the presence of sulfur.The material was characterized by using scanning electron microscopy.The results show that aniline is preferentially polymerized on the surface of sulfur to form a layer of polyaniline on the sulfur surface.Electrochemical characterizations were carried out by using constant charge/discharge,cyclic voltammetry and electrochemical impedance spectroscopy. The results indicate that the polyaniline/sulfur composite exhibits excellent electrochemical properties,when the charge-discharge current density is 0.2 mA/cm^2,the initial capacity of the composite is as high as 1134.01mAh/g and the specific capacity is 526.89 mAh/g after 30 cycles.EIS results show that PANI can reduce the electrochemical reaction resistant.

关 键 词：硫 聚苯胺 包覆 锂电池 

分 类 号：TM912.4[电气工程—电力电子与电力传动]