材料科学
表面改性
涂层
共沉淀
佩多:嘘
锂(药物)
复合数
电解质
化学工程
无定形固体
复合材料
图层(电子)
聚合物
阴极
电极
电化学
电导率
结晶学
物理化学
化学
内分泌学
工程类
医学
作者
Feng Wu,Guang‐Ling Song,Li Li,Xiaoxiao Zhang,Rui Luo,Yusheng Ye,Renjie Chen
标识
DOI:10.1021/acsami.6b07431
摘要
Composites of lithium-rich Li1.2Ni0.2Mn0.6O2 and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PSS) are synthesized through coprecipitation followed by a wet coating method. In the resulting samples, the amorphous conductive polymer films on the surface of the Li1.2Ni0.2Mn0.6O2 particles are 5-20 nm thick. The electrochemical properties of Li1.2Ni0.2Mn0.6O2 are obviously enhanced afterPSS coating. The composite sample with an optimal 3 wt % coating exhibits rate capability and cycling properties that are better than those of Li1.2Ni0.2Mn0.6O2, with an excellent initial discharge capacity of 286.5 mA h g(-1) at a current density of 0.1 C and a discharge capacity that remained at 146.9 mA h g(-1) at 1 C after 100 cycles. The improved performances are ascribed to the high conductivity of thePSS coating layer, which can improve the conductivity of the composite material. ThePSS layer also suppresses the formation and growth of a solid electrolyte interface. Surface modification withPSS is a feasible approach for improving the comprehensive properties of cathode materials.
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