期刊
JOURNAL OF POWER SOURCES
卷 396, 期 -, 页码 276-287出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.06.046
关键词
Lithium-ion batteries; Ni-rich layered cathodes; Graphite anodes; Ethyl 4,4,4-trifluorobutyrate; Solid electrolyte interphase
资金
- Hyundai Motor Company
- National Research Foundation of Korea - Korean Government (MEST) [NRF-2013-C1AAA001-0030538]
An ethyl 4,4,4-trifluorobutyrate (ETFB) additive, with ester and partially fluorinated alkyl moieties, is employed to stabilize the interface structure of Ni-rich layered LiNi0.7Co0.15Mn0.15O2 (NCM) cathodes and graphite anodes. The analysis of the surface chemistry of the electrodes shows that ETFB serves as a Afunctional additive for constructing protective layers on both electrodes in a full cell. Cycling tests reveal that the addition of 1% ETFB leads to excellent capacity retention (84.8%) for the NCM/graphite full cell, which also delivers a superior discharge capacity of 167 mAh g(-1) and a high Coulombic efficiency of over 99.8% after 300 cycles at 45 degrees C. The ETFB-derived protective layer effectively reduces intergranular cracking in secondary NCM cathode particles upon repeated charge-discharge cycling and limits the dissolution of transition metal ions from the cathode at high temperatures. In addition, after ETFB reduction, the graphite anode develops a thermally stable interface structure, which suppresses the self-discharge of graphite coupled with the NCM cathode at 60 degrees C.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据