锂离子电池负极材料锡锰合金的研究.pdfVIP

锂离子电池负极材料锡锰合金的研究 高文明 唐致远 徐强 天津大学化工学院，天津300072，中国 摘要：本文综述了锂离子电池的发展过程、工作原理、特点以及锂离子电池的正负极材料。通过球磨法和化 学还原法制备 Sn-Mn 合金，XRD 实验研究了不同制备条件下 Sn-Mn 合金的组成，充放电和循环伏安实验测试 了合金电极的电化学性能，交流阻抗(EIS)实验分析了表面固体电解质膜(SEI)的形成，并且着重研究了热处 理对合金电极性能的影响。研究结果表明，化学还原法制备的 Sn-Mn 合金的性能优于球磨法制备的 Sn-Mn 合 金的性能。合金在充放电过程中，由于形成Li-Sn合金而导致电极体积膨胀破以及SEI 膜形成，而引起容量 的衰减。热处理技术能改善活性物质内部的晶相结构和活性物质与铜箔的结合度，从而达到改善电极电化学 性能的目的。 关键词 锂离子电池; 负极材料; 锡锰合金; 电化学性能 The Research of Sn-Mn Alloy Cathode for Lithium Secondary Batteries GAO Wen-ming TANG Zhi-yuan XU Qiang School of Chemical Engineering and Technology，Tianjin University，Tianjin 300072， China) Abstract: In this paper,the develop process,work principle,characteristic , anode and cathode materials of Lithium ion battery were summarized.Sn-Mn alloy was prepared by ball milling and chemistry reducing. Composition of Sn-Mn alloy were investigated by XRD.The electronchemical performances of electrode were measured by charge-discharge test and cyclic voltammetry.The formation of solid electrolyte interphase (SEI) was investigated by electrochemical impedance spectrum (EIS).The effect of heat-treatment on the performance of electrode was also investigated.The results showed that the performances of Sn-Mn alloy prepared by chemistry reducing excel that of Sn-Mn by ball milling.In the process of charge-discharge,due to the axpand of elextrode volume and the form of SEI,the capacity was minished.The crystal structure of active materials and the integrate degree between active material and Cu foil were improved by heat treatment,so that the electrochemical performances were promoted. 收稿日期：2006-8-22 作者简介：唐致远，（1946-），安徽人，教授，博士生导师, 主要研究方向为化学电源。E-mail ：