期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 22, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201800802
关键词
electrolyte additives; high energy batteries; interface films; lithium difluoro(bisoxalato) phosphate; lower temperature performances
类别
资金
- National Key R&D Program of China [2018YFB0104000]
- National Natural Science Foundation of China [21573081]
- Natural Science Foundation of Guangdong Province [2017B030306013]
- Key project of Science and Technology in Guangdong Province [2017A010106006]
High energy batteries urgently required to power electric vehicles are restricted by a number of challenges, one of which is the sluggish kinetics of cell reactions under low temperatures. A novel approach is reported to improve the low temperature performance of high energy batteries through rational construction of low impedance anode and cathode interface films. Such films are simultaneously formed on both electrodes via the reduction and oxidation of a salt, lithium difluorobis(oxalato) phosphate. The formation mechanisms of these interface films and their contributions to the improved low temperature performances of high energy batteries are demonstrated using various physical and electrochemical techniques on a graphite/LiNi0.5Co0.2Mn0.3O2 battery using 1 M LiPF6-ethylene carbonate/ethyl methyl carbonate (1/2, in weight) baseline electrolyte. It is found that the interface impedances, especially the one on the anode, constitute the main obstacle to capacity delivery of high energy batteries at low temperatures, while the salt containing fluorine and oxalate substructures used as additives can effectively suppress them.
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