Si PANi基复合负极材料的制备及其电化学性能的研究.pdf

中国科技论文在线 Si/PANi 基复合负极材料的制备及其电化学 性能的研究# 5 摘要：本文以纳米硅和苯胺为原料，通过乳液聚合和高温热解两步法制备 Si/PANi 基复合负极材料，并将 其用作锂离子电池负极材料。研究中采用扫描电镜、红外光谱和X-射线衍射对材料结构进行表征，并通过 恒流充放电方法探讨 Si/苯胺质量比和负电极片制备工艺对其电化学性能的影响。结果表明：复合负极材 料制备过程中 Si/苯胺质量比为 1:2，负电极片制备过程中复合负极材料/导电剂（Super p）/粘结剂（羧 10 甲基纤维素钠）的比例为85:5:10且采用pH=3 的柠檬酸/氢氧化钾缓冲液作为调浆溶剂时，所制备Si/PANi 基复合负极材料表现出高的比容量和良好的循环性能，经20次循环后可逆容量仍为1013mAh/g。 关键词：锂离子电池；Si/PANi基复合负极材料；电化学性能 中图分类号：TB34 15 Study on the preparation of Si/PANi-based composite and its electrochemical performance ZHAO Shuo, XIANG Jun, ZHANG Yong, CHEN Minglu, LI Lixin, XIAN Xiaochao (School of chemistry and chemical engineering, Chongqing University, Chong qing, 400044) Abstract: In this paper, Si/PANi-based composite anode material was prepared by two-step method: 20 emulsion polumerization and pyrolysis, using nano-Si and aniline as raw material. Scanning electron microscope, Fourier transform infrared spectroscopy and X-ray diffraction were used for characterization of samples in this study. Moreover, the effcet of Si/aniline mass ratio and preparation conditions on the electrochemical performance of Si/PANi-based composite anode material was also investigated by galvanostatic charge-discharge method. The results indicate that the Si/PANi-based 25 composite anode material shows high specific capacity and good cycling performance, under the conditions that Si/aniline is 1:2, composite anode material/Super p/CMC is 85:5:10 and citric acid and KOH buffer solution at pH=3 as mashing solvent. Its