期刊
JOURNAL OF POWER SOURCES
卷 235, 期 -, 页码 29-35出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.01.188
关键词
Si-based anode; LaSi2/Si composite; Ionic liquid electrolyte; Thick-film electrode; Gas-deposition method; Li-ion battery
资金
- Li-EAD program of the New Energy and Industrial Technology Development Organization (NEDO) of Japan
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
Anode performances of LaSi2/Si composite thick-films were investigated in ionic liquids as Li-ion battery electrolytes containing cations of N-methyl-N-propylpiperidinium (PP13) or 1-ethyl-3-methylimidazolium and anions of bis(fluorosulfonyl)amide (FSA) or bis(trifluoromethanesulfonyl) amide. The LaSi2/Si electrode exhibited much better performance in PP13-FSA compared with the other electrolytes including a conventional organic solvent one: the reversible capacity at the 250th cycle and its retention were 800 mA h g(-1) and 80%. The excellent performance is attributed to a higher stability of PP13 cations against a cathodic decomposition and an easier desolvation of Li ions and FSA anions at the electrode/electrolyte interface. This result offers a promising applicability of ionic liquid electrolyte to various Si-based anodes with high performances by architecture of cation and anion structures. (c) 2013 Elsevier B.V. All rights reserved.
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