储能科学与技术 ›› 2016, Vol. 5 ›› Issue (4): 478-485.doi: 10.12028/j.issn.2095-4239.2016.00.010

• 研究及进展 • 上一篇    下一篇

锂离子电池LiFePO4/LiNi0.8Co0.15Al0.05O2混合正极材料的电化学热稳定性能

朱  蕾，贾  荻，俞  超，吴勇民，吴晓萌，汤卫平   

  1. 上海空间电源研究所，上海 200245
  • 收稿日期:2015-12-31 修回日期:2016-01-24 出版日期:2016-07-01 发布日期:2016-07-01
  • 通讯作者: 汤卫平，博士，研究员，主要研究方向为盐湖提锂技术、电化学能源材料和全固态电池，E-mail：tangwp@sina.cn。
  • 作者简介:朱蕾（1992—），女，硕士研究生，主要研究方向为电化学能源材料，E-mail：winterzlsi@163.com
  • 基金资助:
    国家863计划（2013AA050901）。

Electrochemical thermal stability of the LiFePO4/LiNi0.8Co0.15Al0.05O2 blend cathode material for lithium ion batteries

ZHU Lei, JIA Di, YU Chao, WU Yongmin, WU Xiaomeng, TANG Weiping   

  1. Shanghai Institute of Space Power Sources , Shanghai 200245, China
  • Received:2015-12-31 Revised:2016-01-24 Online:2016-07-01 Published:2016-07-01

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摘要：

为了改善LiNi0.8Co0.15Al0.05O2正极材料的电化学热稳定性能，加入LiFePO4共混制成了LiFePO4/LiNi0.8Co0.15Al0.05O2锂离子电池用混合正极材料。使用X射线衍射（XRD）和扫描电子显微镜（SEM）表征了结构和形貌，测试了电化学性能。结果显示，简单球磨的混合LiFePO4/LiNi0.8Co0.15Al0.05O2正极材料中，纳米LiFePO4粒子包覆在LiNi0.8Co0.15Al0.05O2粒子表面提高了混合正极材料在充放电过程中的电化学稳定性和结构稳定性。LiFePO4/LiNi0.8Co0.15Al0.05O2混合正极材料在50 ℃下循环100周容量保持率为82.0%，明显地优于单一LiNi0.8Co0.15Al0.05O2材料的72.9%。

关键词: LiNi0.8Co0.15Al0.05O2, LiFePO4, 混合正极材料, 锂离子电池, 热稳定性

Abstract:

The LiFePO4/LiNi0.8Co0.15Al0.05O2 blend cathode material for lithium ion batteries was prepared by ball-milling to improve the electrochemical thermal stability of LiNi0.8Co0.15Al0.05O2. The crystalline structure, morphology and electrochemical performance were characterized by X-ray diffraction, scanning electron microscopy and electrochemical tests. The results showed that LiNi0.8Co0.15Al0.05O2 was coated by the LiFePO4 nanoparticals.  LiFePO4/LiNi0.8Co0.15Al0.05O2 blend cathode material exhibited an excellent electrochemical thermal stability with 82.0% capacity retention after 100 cycles at 50oC, which was is much better than 72.9% of the pristine LiNi0.8Co0.15Al0.05O2.

Key words: LiNi0.8Co0.15Al0.05O2, LiFePO4, blend cathode material, lithium ion battery, thermal stability