Lithium-oxygen batteries with ester-functionalized ionic liquid-based electrolytes
- Authors
- Kim, Jae-Hong; Woo, Hyun-Sik; Jin, So-Jeong; Lee, Je Seung; Kim, Wonkeun; Ryu, Kyounghan; Kim, Dong-Won
- Issue Date
- Sep-2015
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- RSC ADVANCES, v.5, no.97, pp.80014 - 80021
- Indexed
- SCIE
SCOPUS
- Journal Title
- RSC ADVANCES
- Volume
- 5
- Number
- 97
- Start Page
- 80014
- End Page
- 80021
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/156424
- DOI
- 10.1039/c5ra13682b
- ISSN
- 2046-2069
- Abstract
- Ester-functionalized ionic liquids with different cations (imidazolium, pyrrolidinium, piperidinium, morpholinium) and a bis(trifluoromethanesulfonyl) imide anion were synthesized and subsequently mixed with tetra(ethylene glycol) dimethylether (TEGDME) at different concentrations. The mixed solutions were ultimately investigated for their applicability as the electrolyte in non-aqueous lithium-oxygen batteries. Among the ionic liquids investigated, the pyrrolidinium-based ionic liquid, ethyl-N-methylpyrrolidinium-N-acetate bis(trifluoromethanesulfonyl) imide (MEEsPyr-TFSI), exhibited a lower viscosity, higher ionic conductivity and wider electrochemical stability window than any other ionic liquids. The addition of an appropriate amount of MEEsPyr-TFSI to the TEGDME-based organic electrolyte had a positive effect on the ionic conductivity, electrochemical stability and oxygen radical stability. A mixed ionic liquid-based solution with an optimum composition was successfully employed as a promising electrolyte for lithium-oxygen batteries with good cycling stability.
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