Anions with a Dipole: Toward High Transport Numbers in Solid Polymer Electrolytes
journal contributionposted on 2022-03-28, 13:36 authored by Maria Martinez-Ibañez, Eduardo Sanchez-Diez, Uxue Oteo, Ismael Gracia, Itziar Aldalur, Hany B. Eitouni, Mario Joost, Michel Armand, Heng Zhang
Solid-state lithium metal (Li°) batteries (SSLMBs) are believed to be the most promising technology to satisfy the high energy demand, meet the safety requirements, and overcome the limitations ascribed to currently used Li-ion batteries. Solid polymer electrolytes (SPEs) arise as the best candidates mainly due to their easy manufacturing, flexibility, and cost compared to their inorganic counterparts. However, conventional lithium bis(trifluoromethanesulfonyl)imide and poly(ethylene oxide)-based SPEs suffer from a low lithium-ion transference number (TLi+) and poor Li° electrode compatibility as demonstrated by the compromised cyclability of these electrolytes in SSLMBs. Herein, we report the performance of SPEs comprising a newly designed N-ethyl-N-methyl-functionalized sulfonimide lithium salt, with wide electrochemical stability, decreased anionic diffusivity, sufficient Li-ion conductivity, and superior compatibility with the Li° electrode.
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wide electrochemical stabilityhigh energy demanddecreased anionic diffusivityli ° electrodecurrently used listate lithium metal>- ethyl -<li °) batteriessolid polymer electrolytessufficient lilow lithiumion batteries>- methylsuperior compatibilitysafety requirementspromising technologynewly designedlimitations ascribedion conductivityinorganic counterpartseasy manufacturingcost comparedcompromised cyclability>< sub