摘要
为了提高二氧化锡(SnO_(2))作为锂离子电池负极材料的电化学性能,通过化学氧化法合成了化学掺杂聚苯胺包覆SnO_(2)(SnO_(2)@PANI)的复合材料。通过粉末X射线衍射、扫描电子显微镜、红外吸收光谱、比表面积分析、热重分析和电化学测试对复合材料进行了分析研究。结果表明,化学掺杂的聚苯胺包覆在SnO_(2)表面,没有影响SnO_(2)的晶体结构。电化学测试结果显示,随着聚苯胺含量的变化,SnO_(2)负极材料的电化学性能呈现出一定的变化规律。当聚苯胺含量为23%时,SnO_(2)@PANI复合材料表现出较好的循环稳定性:在100 mA/g的电流密度下,循环100次后依然可以保持594 mAh/g的可逆比容量。这表明化学掺杂聚苯胺的包覆对SnO_(2)作为锂离子电池负极材料的电化学性能改善作用是明显的。
In order to improve the electrochemical properties of the tin oxide as anode material for lithium ion battery,SnO_(2) coated with chemical doping polyaniline(SnO_(2)@PANI)composite was synthesized by chemical oxidation.The composite materials were analyzed by powder X-ray diffraction(XRD),scanning electron microscope(SEM),infrared absorption spectrum(FTIR),specific surface area analysis(BET),thermal analysis and electrochemical testing.The results show that the surface of the tin dioxide was successfully coated by polyaniline,and the crystal structure of tin oxide was not affected.The electrochemical testing shows that the cycling stability of the anode electrode material was gradually improved with the coating of polyaniline,especially that the SnO_(2)@PANI composites with 23%PANI shows the best cycle stability.At a current of 100 mA/g,it still remains 594 mAh/g reversible capacity after 100 cycles.This result shows that the chemical doping polyaniline could significantly improve the electrochemical performance of tin dioxide.
作者
赵杏云
艾进进
王晶晶
赖春艳
ZHAO Xingyun;AI Jinjin;WANG Jingjing;LAI Chunyan(Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power,School of Environmental and Chemical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《电源技术》
CAS
北大核心
2021年第8期989-992,1000,共5页
Chinese Journal of Power Sources
基金
上海市科委项目(19DZ2271100)。
