电子元件与材料2017，Vol.36Issue(3)：31-37,7.DOI:10.14106/j.cnki.1001-2028.2017.03.007
锂离子电池混合正极材料LiNi0.5Co0.2Mn0.3O2/LiFePO4电化学性能研究
Electrochemical performances of LiNi0.5Co0.2Mn0.3O2/LiFePO4 blend cathode material for lithium-ion battery
何湘柱 1胡燚 1邓忠德 1孔令涌 2尚伟丽2
作者信息
- 1. 广东工业大学 轻工化工学院,广东 广州 510006
- 2. 深圳市德方纳米科技股份有限公司,广东 深圳 518055
- 折叠
摘要
Abstract
The LiNi0.5Co0.2Mn0.3O2/LiFePO4 blend cathode material for lithium-ion battery was prepared by wet ball-milling. The crystalline structure and morphology of the sample were characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM),and the electrochemical performances of LiNi0.5Co0.2Mn0.3O2/LiFePO4 blend cathode material were investigated by galvanostatic charge/discharge, cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) tests. The results indicate that the crystalline structure of LiNi0.5Co0.2Mn0.3O2/LiFePO4 are preserved well, and the LiNi0.5Co0.2Mn0.3O2 is coated by LiFePO4 nanoparticals. Among all the composite cathodes, the one with 15% mass fraction of LiFePO4 shows the best electrochemical performance.The initial discharge specific capacity of battery is 181.40 mAh·g–1 at 0.2C rate,andthe first charge and discharge efficiency is 90.79%. Its discharge specific capacity is 169.89 mAh·g–1 after 50 cycles at 1.0 Crate, with capacity retention of 97.80%, and the discharge specific capacity is 162.22 mAh·g–1after 5 cycles at 3.0C rate,with capacity retention of 89.43%.After high temperature storaged for 7 days at 60℃, the capacity retention rate and capacity recovery rateare 86.48% and 97.32%,respectively.关键词
湿法球磨法/锂离子电池/混合正极材料/LiNi0.5Co0.2Mn0.3O2/LiFePO4/电化学性能/高温存储Key words
wet ball-milling/Li-ion battery/blend cathode material/LiNi0.5Co0.2Mn0.3O2/LiFePO4/electrochemical performance/high temperature storage分类
信息技术与安全科学引用本文复制引用
何湘柱,胡燚,邓忠德,孔令涌,尚伟丽..锂离子电池混合正极材料LiNi0.5Co0.2Mn0.3O2/LiFePO4电化学性能研究[J].电子元件与材料,2017,36(3):31-37,7.
