摘要
通过水热法制备LiNi0.6Co0.2Mn0.2O2(NCM622)正极材料,采用固相烧结法以柠檬酸为碳源在NCM622正极材料表面进行碳包覆。采用X射线衍射分析(XRD)、扫描电子显微镜(SEM)、交流阻抗、恒流充放电等方法研究碳包覆量对材料结构和性能的影响。结果表明:碳包覆能够显著提高NCM622正极材料的循环稳定性和倍率性能,碳包覆量为2%的NCM622正极材料具有最好性能,在3.0~4.5V电压范围内0.1C恒流充放电,首次放电比容量为167.4mAh/g,1C充放电100周后容量保持率为88.2%。
LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode materials were prepared by hydrothermal method, and then carbon coating on the surface of NCM622 cathode material by solid phase sintering using citric acid as carbon source. X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, constant current charge and discharge were used to study the effect of carbon coating on structure and properties of materials. The results show that carbon coating can significantly improve the cycle stability and rate performance of NCM622 cathode material. 2% carbon coating material has the best performance, the first discharge capacity is 167.4 mAh/g under 0.1Cbetween 3.0 and 4.5 V,the capacity retention is 88.2%after 100 cycles.
作者
郭丽敏
顾志伟
刘全兵
GUO Li-min;GU Zhi-wei;LIU Quan-bing(Polytechnic of Ordos, Ordos Neimenggu 017000, China;Shenzhen Anda Industrial Co.,Ltd., Shenzhen Guangdong 518116, China;School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou Guangdong 510006, China)
出处
《电源技术》
CAS
北大核心
2019年第8期1273-1274,1278,共3页
Chinese Journal of Power Sources
基金
内蒙古自治区规划课题(NZJGH2018136)
关键词
锂离子电池
水热法
三元正极材料
碳包覆
lithiumion battery
hydrothermal method
ternary cathode materials
carbon coating
