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Designing Low Impedance Interface Films Simultaneously on Anode and Cathode for High Energy Batteries
Author(s) -
Liao Bo,
Li Hongying,
Xu Mengqing,
Xing Lidan,
Liao Youhao,
Ren Xiubin,
Fan Weizhen,
Yu Le,
Xu Kang,
Li Weishan
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201800802
Subject(s) - materials science , anode , electrolyte , cathode , electrochemistry , chemical engineering , battery (electricity) , lithium (medication) , energy storage , ethylene carbonate , graphite , dielectric spectroscopy , electrode , optoelectronics , composite material , power (physics) , electrical engineering , chemistry , engineering , medicine , physics , quantum mechanics , endocrinology
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/LiNi 0.5 Co 0.2 Mn 0.3 O 2 battery using 1 m LiPF 6 ‐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.