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.
出处
《现代化工》
EI
CAS
CSCD
北大核心
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
关键词
锂离子电池
单质硫
聚苯胺
电化学性能
lithium ion battery
elemental sulfur
polyaniline
electrochemical performance
