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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (17): 1854-1858. 上一篇    

研究简报

Li[Ni1/3Mn1/3Co1/3]O2掺杂Mo研究

王丽琴; 焦丽芳; 袁华堂*; 郭建; 李海霞; 章明; 王永梅   

  1. (南开大学新能源材料化学研究所 天津 300071)
  • 投稿日期:2005-11-25 修回日期:2006-03-09 发布日期:2006-09-14
  • 通讯作者: 袁华堂

The Study on Mo-Doped Li[Ni1/3Mn1/3Co1/3]O2

WANG Li-Qin; JIAO Li-Fang; YUAN Hua-Tang*; GUO Jian; LI Hai-Xia; ZHANG Ming; WANG Yong-Mei   

  1. (Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071)
  • Received:2005-11-25 Revised:2006-03-09 Published:2006-09-14
  • Contact: YUAN Hua-Tang

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采用高温固相合成法制备了Li[Ni(1－x)/3Mn(1－x)/3Co(1－x)/3Mox]O2 (x＝0, 0.005, 0.01, 0.02). 对它们进行了XRD, SEM, 循环伏安及充放电容量测试, 结果发现, 掺杂x＝0.01 Mo的样品具有较高的嵌锂容量和良好的循环稳定性, 在20 mA/g放电电流密度和2.3～4.6 V的电压范围内具有211.6 mAh/g的首次放电比容量, 循环50周后放电比容量仍能达到185.9 mAh/g, 容量损失为12.1%.

关键词: 锂电池, MoO3, 掺杂, 正极材料

Layered Li[Ni(1－x)/3Mn(1－x)/3Co(1－x)/3Mox]O2 materials (x＝0, 0.005, 0.01, 0.02) were prepared by a solid-state pyrolysis method. Experiments of XRD, SEM, cyclic voltammetry and charge/discharge cycling were carried out. It indicated that when x＝0.01, the sample showed the highest first discharge capacity of 211.6 mAh•g－1 at a current density of 20 mA/g in the voltage range 2.3～4.6 V, and stable cycleability by possessing 185.9 mAh•g－1 after 50 cycles, and the capacity fade was only 12.1%. The Mo-doped samples exhibited higher discharge capacity and better cycleability at room temperature.

Key words: Li battery, MoO3, doping, cathode material