高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (7): 1495-1500.doi: 10.7503/cjcu20180829

• 物理化学 • 上一篇    下一篇

微纳结构富锂锰基层状正极材料的形貌调控与储锂性能

杨金戈, 李宇杰(), 陆地, 陈宇方, 孙巍巍, 郑春满()   

  1. 国防科技大学空天科学学院, 长沙 410073
  • 收稿日期:2018-12-10 出版日期:2019-07-10 发布日期:2019-07-12
  • 作者简介:郑春满, 男, 博士, 教授, 主要从事新能源材料与器件研究. E-mail: zhengchunman@nudt.edu.cn; 李宇杰, 男, 博士, 副教授, 主要从事新能源材料与器件研究. E-mail: powerlyj@163.com
  • 基金资助:
    湖南省自然科学基金(批准号: 2018JJ3595)资助.

Morphology Control and Lithium Storage Performance of Micro/nano Li-rich Cathode Material

YANG Jinge, LI Yujie*(), LU Di, CHEN Yufang, SUN Weiwei, ZHENG Chunman*()   

  1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • Received:2018-12-10 Online:2019-07-10 Published:2019-07-12
  • Contact: LI Yujie,ZHENG Chunman E-mail:powerlyj@163.com;zhengchunman@nudt.edu.cn
  • Supported by:
    † Supported by the Natural Science Foundation of Hunan Province, China(No.2018JJ3595).

摘要:

以金属醋酸盐为原料, 尿素为沉淀剂, 采用水热法辅助高温煅烧制备了三维微纳结构富锂锰基层状材料Li1.2Mn0.54Ni0.13Co0.13O2. 通过调整反应溶剂实现了镍钴锰碳酸盐前驱体向球状和纺锤体状的导向性生长. 其中纺锤体状富锂材料在0.1C倍率下首次放电容量接近300 mA·h/g, 在5C大倍率下放电容量能够达到92 mA·h/g, 在0.5C倍率下循环70周容量保留率能够达到85%.

关键词: 微纳结构, 富锂锰基正极材料, 形貌调控, 锂离子电池

Abstract:

Hierarchical micro/nano Li-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode material was synthesized by urea-based hydrothermal method followed by a heat treatment. The structure and morphology of precursor particles and cathode material particles could be tailored by different reaction solvents. The fusiform Li-rich layered material Li1.2Mn0.54Ni0.13Co0.13O2 delivers an discharge capacity about 300 mA·h/g at a current density of 0.1C and 92 mA·h/g at 5C. Also, the cathode material has a capacity retention of 85% after 70 cycles at 0.5C, showing an excellent cycling performance and rate performance. This method is instructive for synthesizing other cathode materials in energy storage field.

Key words: Micro/nano structure, Li-rich layered cathode material, Morphology control, Lithium-ion battery

中图分类号: