聚苯胺包覆对提高单质硫正极材料的性能研究  

Study on improving properties of elemental sulfur cathode materials by coating PANi

作　　者：马萍[1] 张宝宏[1] 徐宇虹[1] 巩桂英[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《现代化工》2007年第3期30-33,共4页Modern Chemical Industry

基　　金：哈尔滨工程大学基础研究基金(HEUF04064)资助

摘　　要：采用原位聚合法合成了聚苯胺包覆硫复合材料,并分析了产品的晶体结构和表面形貌。苯胺的聚合倾向于在单质硫颗粒表面进行,形成聚苯胺包覆的硫复合材料。以0.2 mA/cm2电流密度充放电,含聚苯胺为15%的聚苯胺/硫复合材料的首次放电容量为1 134.01 mA.h/g,比未改性硫电极增加了82.42%;充放电循环30次后放电电容量为526.89 mA.h/g。当充放电电流密度提高到0.30、.4 mA/cm2时,聚苯胺/硫复合材料的放电容量分别为704.81、194.77 mA.h/g。改性后的聚苯胺/硫复合材料的电化学性能得到了较大的改善。Polyaniline/sulfur composites were synthesized by the in-situ polymerization, and then characterized. The aniline is preferentially polymerized on the surface of sulfur particles to form a layer of polyaniline on the sulfur surface. When the cathode materials are cycled at 0.2 mA/cm^2, the polyaniline/sulfur composites containing 15% of polyaniline can delivered 1 134.01 mA·h/g at the first discharge which is 82.42 % higher than that of bare sulfur. The capacity was still 526.89 mA·h/g after 30 cycles of charge-discharge. When the discharge current density reaches up to 0.3 mA/cm^2 and 0.4 mA/cm^2, the capacity of polyaniline/sulfur composites are 704.81 mA·h/g and 194.77 mA·h/g, respectively.

关 键 词：锂离子电池 单质硫 聚苯胺 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]