Quaternary ammonium room-temperature ionic liquid/lithium salt binary electrolytes: Electrochemical study

被引：94

作者：

Seki, Shiro ^{[1
]}

Ohno, Yasutaka ^{[1
]}

Miyashiro, Hajime ^{[1
]}

Kobayashi, Yo ^{[1
]}

Usami, Akira ^{[1
]}

Mita, Yuichi ^{[1
]}

Terada, Nobuyuki ^{[1
]}

Hayamizu, Kikuko ^{[2
]}

Tsuzuki, Seiji ^{[2
]}

Watanabe, Masayoshi ^{[3
]}

机构：

[1] CRIEPI, Math Sci Res Lab, Tokyo 2018511, Japan

[2] Natl Inst Adv Ind Sci & Technol, Tsukuba Ctr, Tsukuba, Ibaraki 3058565, Japan

[3] Yokohama Natl Univ, Dept Chem & Biotechnol, Yokohama, Kanagawa 2408501, Japan

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2008年 / 155卷 / 06期

关键词：

D O I：

10.1149/1.2899014

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

To determine the properties of the quaternary ammonium cation room-temperature ionic liquid [N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium bis (trifluoromethylsulfonyl) amide (DEMETFSA)] used in lithium secondary battery electrolytes, the lithium ionic transport properties of electrolytes, the characteristics of the interface of a LiCoO2 cathode and a metallic lithium anode, and battery performance were widely investigated. A DEMETFSA-LiTFSA binary electrolyte showed high chemical stability with lithium metal electrode and a relatively high lithium cationic transport number (0.13), as determined by electrochemical measurements. The prepared [LiCoO2 cathode vertical bar DEMETFSA-LiTFSA binary electrolyte vertical bar lithium metal anode] cell showed sufficient charge/discharge reversibility over 100 cycles (voltage range, 4.2-3.0 V). Moreover, the reversibility of capacities and coulombic efficiencies degraded with increasing upper cutoff voltage owing to cathode/electrolyte interfacial degradation, which were analyzed in detail by impedance measurements. (C) 2008 The Electrochemical Society.

引用

页码：A421 / A427

页数：7

共 84 条

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