期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 161, 期 12, 页码 A1851-A1859出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0661412jes
关键词
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资金
- Ministry of Science, ICT & Future Planning [2013K000214]
- Ministry of Education of Korea [2012026203]
Designing and controlling the anode-electrolyte interfacial chemistry of a micron Sn-Ni/graphite composite battery anode led to the formation of a stable solid electrolyte interphase (SEI) layer. We utilized fluoroethylene carbonate (FEC)-based electrolyte that is more interfacially compatible than an EC-based electrolyte, trimethyl phosphite electrolyte additive that reduces the attack of LiPF6-derived acidic species in the electrolyte, and the addition of a low fraction of SnF2 to anode for capturing the F anions of HF present in the electrolyte. Mechanistic surface chemistry studies using ATR FTIR and X-ray photoelectron spectroscopy revealed that the SnF2 transforms to SnF4 by capturing F anions, while FEC and phosphite provide a surface protective and robust SEI. The interfacially controlled composite anode with a tuned content of graphite exhibits good cycling stability (90% retention at the 50th cycle) with high discharge capacity of similar to 800 mAhg(-1) of tin, in contrast to a rapid capacity fade in the conventional electrolyte. (C) 2014 The Electrochemical Society. All rights reserved.
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