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Enhanced lithium-ion conductivity of polymer electrolytes by selective introduction of hydrogen into the anion
journal contributionposted on 2019-06-03, 00:00 authored by Heng Zhang, Uxue Oteo, Haijin Zhu, Xabier Judez, Maria Martinez-Ibañez, Itziar Aldalur, Eduardo Sanchez-Diez, Chunmei Li, Javier Carrasco, Maria ForsythMaria Forsyth, Michel Armand
The anion chemistry of lithium salts plays a pivotal role in dictating the physicochemical and electrochemical performance of solid polymer electrolytes (SPEs), thus affecting the cyclability of all-solid-state lithium metal batteries (ASSLMBs). The bis(trifluoromethanesulfonyl)imide anion (TFSI- ) has long been studied as the most promising candidate for SPEs; however, the Li-ion conductivities of the TFSI-based SPEs still remain low (Li-ion transference number: ca. 0.2). In this work, we report new hydrogen-containing anions, conceived based on theoretical considerations, as an electrolyte salt for SPEs. SPEs comprising hydrogen-containing anions achieve higher Li-ion conductivities than TFSI-based ones, and those anions are electrochemically stable for various kinds of ASSLMBs (Li-LiFePO4 , Li-S, and Li-O2 batteries). This opens up a new avenue for designing safe and high-performance ASSLMBs in the future.