Imidazolium ionic liquids containing LiBOB electrolyte for lithium battery

被引：39

作者：

Saruwatari, Hidesato ^{[1
]}

Kuboki, Takashi ^{[1
]}

Kishi, Takashi ^{[1
]}

Mikoshiba, Satoshi ^{[1
]}

Takami, Norio ^{[1
]}

机构：

[1] Toshiba Co Ltd, Ctr Corp Res & Dev, Saiwai Ku, Kawasaki, Kanagawa 2128582, Japan

来源：

JOURNAL OF POWER SOURCES | 2010年 / 195卷 / 05期

关键词：

Room-temperature ionic liquids; 1-Ethyl-3-methyl-imidazolium tetrafluoroborate; Lithium bis(oxlate)borate; Li battery; TEMPERATURE MOLTEN-SALT; LI; ADDITIVES;

D O I：

10.1016/j.jpowsour.2009.08.081

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Bis(oxlate)borate anion (BOB-) has high reduction potential for 1-ethyl-3-methyl-imdazolium tetrafluoroborate (EMIBF4) and forms solid electrolyte interface (SEI) on lithium (Li) metal surface. The addition of BOB- may make possible the use of EMIBF4 for Li metal battery. The electrochemical properties of ionic liquids containing EMIBF4 were analyzed. We investigated the stability of LiBOB/EMIBF4 and LiBF4/EMIBF4 electrolyte for Li metal and the performance of Li/MnO2 batteries with the electrolytes by H-1 NMR, ac impedance spectra and the electrochemical method. From the H-1 NMR spectra, LiBOB/EMIBF4 was stable for Li metal and LiBF4/EMIBF4 was reduced on the surface of Li metal. The discharge capacity of MnO2 cathode with LiBOB/EMIBF4 was 235 mAh g(-1). Li metal plating and stripping and Li-Al alloying reaction were reversible in LiBOB/EMIBF4. Charge-discharge reaction of Li-Al alloy in LiBOB/EMIBF4 had a high coulomb efficiency. The Coulomb efficiency at 1st cycle was 86% and the efficiency at 5th cycle was up to 94%. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1495 / 1499

页数：5

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