Authors: Xunhui Xiong Dong Ding Zhixing Wang Bin Huang Huajun Guo Xinhai Li
Publish Date: 2014/05/29
Volume: 18, Issue: 9, Pages: 2619-2624
Abstract
A facile method for the surface modification of highvoltage and hightemperature LiNi08Co01Mn01O2 cathode materials is demonstrated In order to prepare polypyrrole PPy coating LiNi08Co01Mn01O2 material the facile chemical polymerization method uses FeIII tosylate as oxidant and ethanol as solvent to avoid the side reaction with solvent TEM depicts that LiNi08Co01Mn01O2 serves as hard template and the nanoscale PPy layer grows along the surface of LiNi08Co01Mn01O2 during the synthesis process Because of flocculent and nanofiber coating layer much improved rate performance high temperature cycling as well as high voltage performance are obtained Cyclic voltammetry CV and electrochemical impedance spectroscopic EIS results demonstrate that the PPy coating layer effectively alleviates the side reactions between liquid electrolytes and LiNi08Co01Mn01O2 surface that are highly unstable at high temperature and high charge voltage
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