东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (5): 671-675.DOI: 10.12068/j.issn.1005-3026.2017.05.013

• 材料与冶金 • 上一篇    下一篇

溶胶凝胶辅助高温球磨合成LiCr○xMn2-○x○O4

耿树东1,2， 翟玉春1   

  1. (1. 东北大学 冶金学院， 辽宁 沈阳110819; 2. 吉林化工学院 材料科学与工程学院， 吉林 吉林132022)
  • 收稿日期:2016-05-30 修回日期:2016-05-30 出版日期:2017-05-15 发布日期:2017-05-11
  • 通讯作者: 耿树东
  • 作者简介:耿树东(1979-)，男，吉林松原人，东北大学博士研究生； 翟玉春(1946-)，男，辽宁辽阳人，东北大学教授，博士生导师.
  • 基金资助:

    国家自然科学基金重点资助项目 (51234009).

Synthesis of LiCr○xMn2-○x○O4 by Sol-Gel Assisted High Temperature Ball Milling

GENG Shu-dong1,2， ZHAI Yu-chun1   

  1. 1. School of Metallurgy， Northeastern University， Shenyang 110819， China; 2. School of Materials Science & Engineering， Jilin Institute of Chemical Technology， Jilin 132022， China.
  • Received:2016-05-30 Revised:2016-05-30 Online:2017-05-15 Published:2017-05-11
  • Contact: ZHAI Yu-chun
  • About author:-
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摘要：

以氢氧化锂、醋酸铬、醋酸锰为原料，用溶胶凝胶辅助高温球磨法合成了尖晶石型LiCr○xMn2-○x○O4(x=0.05， 0.1， 0.2)正极材料.研究了掺杂不同量Cr对材料的相结构、形貌和充放电性能的影响，并与未掺杂的LiMn2O4对比.结果表明:掺杂Cr后材料的容量保持率相对LiMn2O4有很大提高;材料的放电比容量随着掺杂量的增大逐渐减小，当x=0.2时放电比容量已低于LiMn2O4;当x=0.05时，所制备产物的充放电性能最佳，在0.1倍率下，首次放电容量达到119.6mAh/g，循环40次后放电容量保持率为97.4%.而且，从0.1到2.0不同倍率下循环100次后放电容量保持率为96.3%.

关键词: 锂离子电池, 溶胶凝胶, 高温球磨, Cr掺杂, 电化学性能

Abstract:

Spinel LiCr○xMn2-○x○O4 cathode material was synthesized by sol-gel assisted high temperature ball milling method using LiOH·H2O， Cr(CH3COO)3·6H2O and Mn(CH3COO)2·4H2O as raw materials . The crystal structure， surface morphology and charge-discharge performance of materials by doping different amounts of Cr were studied. The results show that the capacity retention rate of the material is greatly improved by Cr doping. The discharge capacity of the material decreases with the increasing doping amounts of Cr. The discharge specific capacity of LiCr0.2Mn1.8O4 is lower than that of LiMn2O4. The charge-discharge performance of LiCr0.05Mn1.95O4 is optimal and its initial discharge capacity is 119.6mAh/g and the discharge capacity retention rate is 97.4% after 40 cycles at a rate of 0.1. Furthermore， the discharge capacity retention rate is 96.3% after 100 cycles at various rates from 0.1 to 2.0.

Key words: lithium-ion battery, sol-gel, high temperature ball milling, Cr-doped, electrochemical properties

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