物理化学学报 >> 2002, Vol. 18 >> Issue (02): 188-192.doi: 10.3866/PKU.WHXB20020220

研究简报 上一篇    

锂离子电池正极材料锰酸锂合成的动力学

赵铭姝;翟玉春;田彦文   

  1. 东北大学材料与冶金学院,沈阳 110004
  • 收稿日期:2001-07-23 修回日期:2001-10-23 发布日期:2002-02-15
  • 通讯作者: 赵铭姝 E-mail:zhaomshu@163.net

Study on Kinetics of Synthesizing Spinel LiMn2O4 for Lithium-ion Battery Cathode

Zhao Ming-Shu;Zhai Yu-Chun;Tian Yan-Wen   

  1. School of Material and Metallurgy, Northeastern University, Shenyang 110004
  • Received:2001-07-23 Revised:2001-10-23 Published:2002-02-15
  • Contact: Zhao Ming-Shu E-mail:zhaomshu@163.net

摘要: 用DTA和XRD方法研究空气气氛中合成锰酸锂的反应过程,利用Doyle-Ozawa法和Kissinger法计算出各反应阶段的表观活化能,依次为66.3、72.6 、128.1和113.9 kJ•mol-1.用Kissinger法确定每个反应阶段的反应级数、频率因子和动力学方程.由LiOH•H2O和MnO2合成尖晶石型锰酸锂的动力学,可为制备锰酸锂提供理论依据. XRD、SEM和粒度分析表明,理论优化工艺后合成的LiMn2O4物相纯净,形貌规整,颗粒分布均匀.

关键词: 锂离子电池, 锰酸锂, 合成动力学, 微观表征

Abstract: The reaction processes including synthesis of LiMn2O4 with LiOH•H2O and MnO2 were studied by means of DTA under atmosphere pressure, and the result obtained could be applied as an important theoretical basis for preparing LiMn2O4. Table 1~3 show the activation energies of each reaction process obtained by using Doyle-Ozawa method and Kissinger method as follows : 66.3, 72.6, 128.1 and 113.9 kJ•mol-1. Reaction orders and frequency factors were determined by making use of Kissinger method. And the kinetic equations of each reaction were deduced. X-ray diffraction patterns(XRD), scanning electron microscope(SEM)result and size distribution measurements Fig.3~4 show that the synthesized LiMn2O4 possesses pure phase, regular appearance and normal distribution.

Key words: Lithium-ion battery, LiMn2O4, Synthesizing kinetics, Micro-characters