Enhanced High-Temperature Cycling Stability of LiMn<SUB>2</SUB>O<SUB>4</SUB>by LiCoO<SUB>2</SUB>Coating as Cathode Material for Lithium Ion Batteries

• 作者: Baojia Xia Haohan Liu Jing Yan Xinxin Zhao Yiming Mi Yuelei Wang
• 来源期刊: 材料科学与化学工程(英文)
• 学科: 工学
• 关键词: LIMN2O4 Sol-Gel Method Surface COATING Electrochemical Performance
• 年，卷（期）: 2014,（12）
• 页码范围: 12-18
• 页数: 7页
• 分类号: TM9

摘要

LiCoO2 surface layer is proposed and prepared through sol-gel method. The physical and electrochemical performances of pristine LiMn2O4 and LiCoO2-coated LiMn2O4 cathode materials were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, electrochemical measurements respectively. Comparing with the pristine LiMn2O4, the LiCoO2- coated LiMn2O4 phase significantly improved cycling stability, especially at 55°C. Additionally, the thermal safety of LiMn2O4 is greatly enhanced after being coated by LiCoO2. ICP-AES measurement, structural analysis, and impedance experiments indicate that the improved electrochemical property of LiCoO2-coated LiMn2O4 should be attributed to the alleviated dissolution loss of manganese, strengthened structural stability.