1,1-Difluoro-1-alkenes as new electrolyte additives for lithium ion batteries

JOURNAL OF POWER SOURCES

卷:207

Article

Kubota, Tadahiko¹  Ihara, Masayuki¹  Katayama, Shinichi²  Nakai, Hideki²  Ichikawa, Junji³ 

[1] Sony Corp, Koriyama, Fukushima 9630531, Japan

[2] Sony Energy Devices Corp, Koriyama, Fukushima 9630531, Japan

[3] Univ Tsukuba, Grad Sch Pure & Appl Sci, Dept Chem, Tsukuba, Ibaraki 3058571, Japan

关键词: Lithium ion battery;    Electrolyte additive;    1,1-Difluoro-1-alkene;    Solid electrolyte interphase;    XPS;    ToF-SIMS;   

DOI  :  10.1016/j.jpowsour.2012.01.139

来源: Elsevier

【 摘 要 】

Five 1,1-difluoro-1-alkenes bearing aryl groups are investigated as electrolyte additives for high-charge-voltage lithium ion batteries with an aim to induce favorable solid electrolyte interphase (SEI) formation. Among them, 1,1-difluoro-4-phenylbut-1-ene (DF-1) forms appropriate SEIs on the cathode and anode by its reactions under oxidative and reductive conditions, respectively, which was suggested by linear sweep and cyclic voltammetry. The SEls formed with the DF-1 containing electrolyte on the cathode and anode were analyzed by X-ray photoelectron spectroscopy and time of flight-secondary ion mass spectrometry, indicating the following: (i) the cathode surface has a LiF-rich layer with unsaturated hydrocarbons, and (ii) the anode surface also has a LiF-rich layer, which probably includes fluoromethylene (CHF) compounds. The formation of the SEls on both electrodes with OF-1 results in low impedance being maintained, and thus, particularly good cycle performance even at high-charge-voltage. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

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