高等学校化学学报

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (12): 2358.

• 研究论文 • 上一篇    下一篇

锂离子电池富锂正极材料Li[NixLi1/3-2x/3Mn2/3-x/3]O2(x=1/5, 1/4, 1/3)的合成及电化学性能

王绥军, 赵煜娟, 赵春松, 夏定国   

  1. 北京工业大学环境与能源工程学院, 北京100124
  • 收稿日期:2009-01-18 出版日期:2009-12-10 发布日期:2009-12-10
  • 通讯作者: 夏定国, 男, 博士, 教授, 主要从事新能源材料研究. E-mail: dgxia@bjut.edu.cn
  • 基金资助:

    北京市自然科学基金(批准号: 2093031)资助.

Synthesis and Electrochemical Behavior of Li-rich Cathode Materials Li[NixLi1/3-2x/3Mn2/3-x/3]O2(x=1/5, 1/4, 1/3) in the Lithium-ion Battery

WANG Sui-Jun, ZHAO Yu-Juan, ZHAO Chun-Song, XIA Ding-Guo*   

  1. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2009-01-18 Online:2009-12-10 Published:2009-12-10
  • Contact: XIA Ding-Guo. E-mail: dgxia@bjut.edu.cn
  • Supported by:

    北京市自然科学基金(批准号: 2093031)资助.

PDF (PC)

摘要：

通过共沉淀法制备了M(OH)2(M=Mn, Ni)前驱体, 并与LiOH混合, 合成了锂离子电池富锂正极材料Li[NixLi1/3-2x/3Mn2/3-x/3]O2, 采用XRD、SEM和充放电实验对其进行表征. 研究结果表明, Li, Ni, Mn原子在M层中呈有序分布, 形成超结构; 富锂正极材料由亚微米的一次粒子团聚组成1~3 μm颗粒; 在2.0~4.8 V电位范围内, 充放电电流密度为10 mA/g时, 富锂正极材料表现出很高的可逆比容量, 达到200~240 mA·h/g, 同时具有良好的循环可逆性能.

关键词: 锂离子电池; 富锂正极材料; 层状结构; 电化学性能

Abstract:

The Li-rich cathode materials Li[NixLi1/3-2x/3Mn2/3-x/3]O2(x=1/5, 1/4, 1/3) were synthesized with co-precipitated metal hydroxide precursors M(OH)2(M=Mn, Ni). The results of X-ray diffraction(XRD) and selected area electron diffraction(SAED) analysis confirmed the Li, Ni and Mn atoms are ordered in the M layer to form the superstrucutre. Images of scanning electron microscopy(SEM) show the Li-rich materials particles are about 1—3 μm, aggregated of submicron grains. Electrochemical behavior was examined by charge-discharge cycling. The Li[NixLi1/3-2x/3Mn2/3-x/3]O2(x=1/5, 1/4, 1/3) materials exhibited high reversible capacity of 200—240 mA·h/g and excellent cycle performance between 2.0 and 4.8 V at 10 mA/g current density.

Key words: Lithium ion battery; Li-rich cathode material; Layered structure; Electrochemical behavior

TrendMD: