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Poly(ethylene-oxide)-based polymer electrolyte incorporating room-temperature ionic liquid for lithium batteries

 

Jae-Won Choia, Gouri Cheruvallya, Yeon-Hwa Kima, Jae-Kwang Kima, James Manuela, Prasanth Raghavana, Jou-Hyeon Ahna,*, Ki-Won Kimb, Hyo-Jun Ahnb, Doo Seong Choic, Choong Eui Song c

 

a Department of Chemical and Biological Engineering and ITRC for Energy Storage and Conversion, Gyeongsang National University, 900 Gajwa-dong, Jinju 660-701, South Korea

b School of Nano and Advanced Materials Engineering and ITRC for Energy Storage and Conversion, Gyeongsang National University, 900 Gajwa-dong, Jinju 660-701, South Korea

c Institute of Basic Science and Department of Chemistry, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon City, Gyeonggi-do, South Korea

 

Abstract

The effect of incorporating a room temperature ionic liquid, 1-butyl-3-methylimidazolium is (trifluoromethanesulfonyl)imide (BMITFSI), in the polymer electrolyte (PE) based on poly(ethylene oxide)-(lithiumbis(trifluoromethane sulfonyl) imide) [PEO-LiTFSI] was investigated. BMITFSI content was varied between 20 and 80 parts by weight (pbw) in 100 pbw of PEO-LiTFSI and the influence on ionic conductivity, electrochemical stability and interfacial properties on lithium electrode was studied. A remarkable increase in ionic conductivity was achieved with BMITFSI addition, the effect being most pronounced at lower temperatures. Compared to PEO-LiTFSI, the PEs containing BMITFSI exhibited well-defined redox peaks corresponding to stripping and deposition of lithium. The PEs containing BMITFSI exhibited good electrochemical stability and significantly lowinterfacial resistance with the lithium electrode. Good discharge performance with 82% active material utilization and stable cycling property was achieved when the PE containing 60 pbw of BMITFSI was evaluated in Li/LiFePO4 cells at 40 °C.

 

Keywords: Room temperature ionic liquid; Polymer electrolyte; Lithium battery; Ionic conductivity; Imidazolium salts

 

© 2007 Elsevier B.V. All rights reserved.

 

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