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Improvement of the Cationic Transport in Polymer Electrolytes with (Difluoromethanesulfonyl)(trifluoromethanesulfonyl)imide Salts
Author(s) -
Oteo Uxue,
MartinezIbañez Maria,
Aldalur Itziar,
SanchezDiez Eduardo,
Carrasco Javier,
Armand Michel,
Zhang Heng
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801472
Subject(s) - cationic polymerization , imide , ionic conductivity , electrolyte , alkali metal , materials science , conductivity , polymer , ethylene oxide , inorganic chemistry , thermal stability , fast ion conductor , polymer chemistry , chemical engineering , chemistry , organic chemistry , composite material , electrode , copolymer , engineering
Solid polymer electrolytes (SPEs) with high cationic conductivity are highly desired for enhancing the power performance of all‐solid‐state alkali metal batteries (ASSAMBs). In this work, a new sulfonimide anion, (difluoromethanesulfonyl)(trifluoromethanesulfonyl)imide (DFTFSI − ), is proposed as a possible alternative to the most widely used bis(trifluoromethanesulfonyl)imide anion (TFSI − ) for attaining higher cationically conductive SPEs. Our results show that DFTFSI‐based alkali metal salts maintain the merits of TFSI‐based ones (e. g. good chemical and thermal stability as well as structural flexibility). The hydrogen‐bond interaction between DFTFSI − and poly(ethylene oxide) effectively enhances the cationic conductivity of DFTFSI‐based SPEs at a low expense of total ionic conductivity. In addition to the promising application of DFTFSI‐based SPEs in ASSAMBs, this work also reveals that customizing the chemical structure of anions with the consideration of the properties of polymer matrices is of utmost importance for accessing robust SPEs in the future.