摘要
将LiMn0.75Fe0.25PO4与LiNi0.6Co0.2Mn0.2O2以常规搅拌方式制成复合正极,搭配常规人造石墨及陶瓷隔膜,所组装的电池表现出与三元电池相似的电压平台和能量密度,更优的低温性能(-20℃低温放电容量相当于常温容量的74.5%)以及更长的循环寿命(常温循环寿命为3 672次@86.7%),并且能够通过针刺安全测试。而先将LiMn0.75Fe0.25PO4包覆在LiNi0.6Co0.2Mn0.2O2上,再正常合浆的正极,对比常规搅拌方式得到的正极在针刺安全性方面略有优势。
The battery was assembled by composite cathode made fromLiMn0.75Fe0.25 PO4 and LiNi0.6Co0.2Mn0.2 O2 by conventional stirring method, conventional artificial graphite and ceramic separator. Compared with the battery using NCM, the assembled battery shows a similar voltage platform and energy density, better low temperature performance(discharge capacity at-20 ℃ is 74.5% of that at room temperature) and longer cycle life(RT cycle life is 3 672 cycles at 86.7%). Furthermore, it can pass the safety test of nail. Meanwhile, the compositing cathode made by coating LiMn0.75Fe0.25 PO4 on LiNi0.6Co0.2Mn0.2 O2 firstly and then normal compounding slurry has the advantage of safety of nail compared with that made by conventional method.
作者
贺志龙
田爽
刘兆平
杜强
蒋亚北
HE Zhi-long;TIAN Shuang;LIU Zhao-ping;DU Qiang;JIANG Ya-bei(Advanced Li-ion Battery Engineering Lab,Ningbo Institute of Materials Technology&Engineering,CAS,Ningbo Zhejiang 315201,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《电源技术》
CAS
北大核心
2019年第11期1745-1748,共4页
Chinese Journal of Power Sources
基金
中国科学院关键技术人才项目(Y70602WR02)
