材料科学
复合数
锂(药物)
阴极
化学工程
硫黄
电池(电)
多硫化物
锂硫电池
复合材料
纳米技术
储能
法拉第效率
冶金
电化学
电极
电气工程
物理化学
化学
内分泌学
工程类
医学
作者
Wang Jl,Jun Yang,Wan Cr,Ke‐Zhao Du,Jian Xie,Xu Nx
标识
DOI:10.1002/adfm.200304284
摘要
Conductive polymer/sulfur composite materials were prepared by heating the mixture of polyacrylonitrile (PAN) and sublimed sulfur. During the heating process, PAN was dehydrogenated by sulfur, forming a conductive main chain similar to polyacetylene. At the same time, the high-polarity functional group –CN cyclized at the melt state, forming a thermally stable heterocyclic compound in which sulfur was embedded. The nanodispersed composites showed excellent electrochemical properties. Tested as cathode material in a non-aqueous lithium cell based on poly(vinylidene fluoride) (PVDF) gel electrolyte at room temperature, the composite exhibited a specific capacity up to 850 mA h g–1 in the initial cycle. Its specific capacity remained above 600 mA h g–1 after 50 cycles, about five times that of LiCoO2, and recovered partly after replacement of the anode with a fresh lithium sheet. The utilization of the electrochemically active sulfur was about 90 % assuming a complete reaction to the product, Li2S.
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