Synthesis and Properties of Acyclic Ammonium-based Ionic Liquids with Allyl Substituents as Electrolytes

Molecules

Taeeun Yim¹  Chang Young Choi¹  Junyoung Mun¹  Seung M. Oh¹ 

[1] Department of Chemical and Biological Engineering, Research Center for Energy Conversion & Storage, Seoul National University, Seoul 151-744, Korea

关键词: ionic liquid;    ammonium;    bis(trifluoromethanesulfonyl)imide (TFSI);    allyl substituent;    battery electrolyte;   

DOI  :  10.3390/molecules14051840

来源: mdpi

【 摘 要 】

Several new acyclic ammonium-TFSI ionic liquids with an allyl substituent(s) were synthesized and their physicochemical and electrochemical properties were characterized. [AAMM]Am-TFSI (3) with two allyl groups showed the widest electrochemical stability window (5.9 V) among the ammonium-based ILs reported to date because of the increment of both the anodic and cathodic limits. The charge-discharge performance of a LiCoO₂-based half-cell containing [AAMM]Am-TFSI as an electrolyte was better in cycleability (the capacity retention ratio: 99% after 20 cycles) than that of the cell with the corresponding partially saturated analogue, [AMMP]Am-TFSI (2) (the capacity retention ratio: 92% after 20 cycles).

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.