物理化学学报 >> 2007, Vol. 23 >> Issue (01): 134-138.doi: 10.3866/PKU.WHXB20070128

研究简报 上一篇    

SAC法制备LiNi0.01Co0.01Mn1.98O4及其电化学性能

唐致远;余明远;薛建军;高飞;崔燕;黎良栋   

  1. 天津大学化工学院, 天津 300072; 广州鹏辉电池有限公司, 广州 511483
  • 收稿日期:2006-08-18 修回日期:2006-09-20 发布日期:2007-01-08
  • 通讯作者: 唐致远 E-mail:zytang@tju.edu.cn

Electrochemical Properties and Synthesis of LiNi0.01Co0.01Mn1.98O4 by SAC Route for Lithium Secondary Battery

TANG Zhi-Yuan;YU Ming-Yuan;XUE Jian-Jun;GAO Fei;CUI Yan;LI Liang-Dong   

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China; Guangzhou Great Power Battery Co. Ltd., Guangzhou 511483, P. R. China
  • Received:2006-08-18 Revised:2006-09-20 Published:2007-01-08
  • Contact: TANG Zhi-Yuan E-mail:zytang@tju.edu.cn

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摘要： 采用SAC (starch-assisted combustion)法和高温固相法分别合成锂离子电池正极材料LiNi0.01Co0.01Mn1.98O4, 使用X射线衍射仪、BET法、粒度分析仪及扫描电子显微镜对合成材料的结构及物理性能进行了表征. 将合成材料作为锂离子电池正极活性材料, 用循环伏安、交流阻抗及充放电测试的电化学测试方法对材料进行了电化学的研究. 结果表明, 两种方法制备的材料均为纯尖晶石相; SAC法制备的LiNi0.01Co0.01Mn1.98O4颗粒小, 粒径分布均匀, 具有更好的结晶形态. SAC法制备材料在0.1C充放电条件下的初始放电容量为121.2 mAh•g−1, 100次循环后容量损失仅为3.5%, 5C放电的初始放电容量则达到了103.5 mAh•g−1. SAC法的一步工序具有操作简单、成本低廉的优势, 有望实现商业应用.

关键词: SAC法, LiNi0.01Co0.01Mn1.98O4, 循环伏安法, 交流阻抗法, 电化学性能

Abstract: LiNi0.01Co0.01Mn1.98O4 materials were prepared by two different methods: starch-assisted combustion (SAC), and traditional solid-state reaction. The product characteristics such as phase composition, particle morphology, and size of as-prepared materials were examined with powder X-ray diffraction (XRD), the Brunauer-Emmett-Teller (BET) surface area method, particle size analysis, and analytical scanning electron microscope (SEM), respectively. Both materials exhibited pure spinel structure. The SAC method provided better control of the morphology, particle size, and distribution of the active material. The as-prepared powders were used as positive electrode materials for lithium-ion battery, whose discharge capacity and cycle voltammogram properties were examined. The results showed that the material synthesized by SAC method had high initial specific capacity of 121.2 mAh•g−1 and only 3.5% loss of the capacity after 100 cycles at a rate of 0.1C, and the initial specific capacity was 103.5 mAh•g−1 at a discharge rate of 5C. The single-step process of SAC method is time and cost saving, and thus is promising for commercial application.

Key words: Starch-assisted combustion method, LiNi0.01Co0.01Mn1.98O4, Cyclic voltammetry, EIS, Electrochemical performance