Single-ion lithium conducting polymers with high ionic conductivity based on borate pendant groups
Date
2021-12-29Author
Guzmán González, Gregorio
Vauthier, Soline
Álvarez Tirado, Marta
Cotte, Stéphane
Castro, Laurent
Guéguen, Aurélie
Casado Pérez, Nerea
Mecerreyes Molero, David
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Angewandte Chemie 134(7) : (2022) // Article ID e202114024
Abstract
This communication reports a family of single-ion lithium conducting polymer electrolytes based on highly delocalized borate groups is reported. The effect of the nature of the substituents on the boron atom on the ionic conductivity of the resultant methacrylic polymers was analyzed. To the best of our knowledge the lithium borate polymers endowed with flexible and electron-withdrawing substituents presents the highest ionic conductivity reported for a lithium single-ion conducting homopolymer (1.65×10−4 S cm−1 at 60 °C). This together with its high lithium transference number tLi+= =0.93 and electrochemical stability window of 4.2 V vs Li0/Li+ show promise for application in lithium batteries. To illustrate this, a lithium borate monomer was integrated into a single-ion gel polymer electrolyte which showed good performance on lithium symmetrical cells (<0.85 V at ±0.2 mA cm−2 for 175 h).