物理化学学报 >> 2012, Vol. 28 >> Issue (04): 823-830.doi: 10.3866/PKU.WHXB201202102

电化学和新能源 上一篇    下一篇

锂离子电池正极材料xLi2MnO3·(1-x)Li[Ni1/3Mn1/3Co1/3]O2的制备及表征

王昭, 吴锋, 苏岳锋, 包丽颖, 陈来, 李宁, 陈实   

  1. 北京理工大学化工与环境学院, 国家高技术绿色材料发展中心, 北京 100081
  • 收稿日期:2011-11-17 修回日期:2012-01-09 发布日期:2012-03-21
  • 通讯作者: 苏岳锋 E-mail:suyuefeng@bit.edu.cn
  • 基金资助:

    国家重点基础研究发展规划(973) (2009CB220100),国家自然科学基金(51102018)和国家高技术研究发展计划(863) (SQ2010AA1123116001)资助项目

Preparation and Characterization of xLi2MnO3·(1-x)Li[Ni1/3Mn1/3Co1/3]O2 Cathode Materials for Lithium-Ion Batteries

WANG Zhao, WU Feng, SU Yue-Feng, BAO Li-Ying, CHEN Lai, LI Ning, CHEN Shi   

  1. National Development Center of Hi-Tech Green Materials, School of Chemical Engineering & Environment, Beijing Institute of Technology, Beijing 100081, P. R. China
  • Received:2011-11-17 Revised:2012-01-09 Published:2012-03-21
  • Contact: SU Yue-Feng E-mail:suyuefeng@bit.edu.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2009CB220100), National Natural Science Foundation of China (51102018), and National High-Tech Research and Development Program of China (863) (SQ2010AA1123116001).

摘要: 以过渡金属乙酸盐和乙酸锂为原料, 柠檬酸为螯合剂, 通过溶胶-凝胶法结合高温煅烧法制备了锂离子电池富锂锰基正极材料xLi2MnO3·(1-x)Li[Ni1/3Mn1/3Co1/3]O2, 采用X射线衍射(XRD), 扫描电子显微镜(SEM)和电化学性能测试对所得样品的结构, 形貌及电化学性能进行了表征. 结果表明: x=0.5时, 在900 °C下煅烧12 h得到颗粒均匀细小的层状xLi2MnO3·(1-x)Li[Ni1/3Mn1/3Co1/3]O2材料, 并具有良好的电化学性能, 在室温下以20mA·g-1的电流密度充放电, 2.0-4.8 V电位范围内首次放电比容量高达260.0 mAh·g-1, 循环40次后放电比容量为244.7 mAh·g-1, 容量保持率为94.12%.

关键词: 锂离子电池, 溶胶-凝胶, 固溶体, 正极材料, 电化学性能

Abstract: The lithium rich cathode materials xLi2MnO3·(1-x)Li[Ni1/3Mn1/3Co1/3]O2 (x=0.4, 0.5, 0.6) were successfully synthesized via sol-gel method with calcination in air. The transition metal acetate, lithium acetate, and citric acid were used as raw materials. The as-prepared materials were characterized by X-ray diffraction (XRD), scaning electron microscopy (SEM), and electrochemical tests. The material 0.5Li2MnO3·0.5LiNi1/3Mn1/3Co1/3]O2, which was obtained after calcination at 900 °C for 12 h, exhibited fine microstructures and good electrochemical performance. When cycled at 2.0-4.8 V with a current density of 20 mA·g-1 at room temperature, 0.5Li2MnO3·0.5LiNi1/3Mn1/3Co1/3]O2 delivered a initial discharge specific capacity of 260.0 mAh·g-1, and maintained a capacity of 244.7 mAh·g-1 after 40 cycles (capacity retention 94.12%).

Key words: Lithium-ion battery, Sol-gel, Solid solution, Cathode material, Electrochemical performance

MSC2000: 

  • 锂离子电池