Synthesis and properties of acyclic ammonium-based ionic liquids with allyl substituents as electrolytes.
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 LiCoO(2)-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).
Yim
Taeeun
T
Department of Chemical and Biological Engineering, Research Center for Energy Conversion & Storage, Seoul National University, Seoul, Korea. yte0102@snu.ac.kr
Choi
Chang Young
CY
Mun
Junyoung
J
Oh
Seung M
SM
Kim
Young Gyu
YG
D004563:Electrochemistry; D004573:Electrolytes; D052578:Ionic Liquids / Q000138:chemical synthesis / Q000737:chemistry; D015394:Molecular Structure; D009930:Organic Chemicals / Q000138:chemical synthesis / Q000737:chemistry; D000644:Quaternary Ammonium Compounds / Q000138:chemical synthesis / Q000737:chemistry; D013696:Temperature
D004573:Electrolytes; D052578:Ionic Liquids; D009930:Organic Chemicals; D000644:Quaternary Ammonium Compounds