Single‐Ion Lithium Conducting Polymers with High Ionic Conductivity Based on Borate Pendant Groups. Issue 7 (29th December 2021)

• Record Type: Journal Article
• Authors: Guzmán‐González, Gregorio; Vauthier, Soline; Alvarez‐Tirado, Marta; Cotte, Stéphane; Castro, Laurent; Guéguen, Aurélie; Casado, Nerea; Mecerreyes, David
• Is Part Of: Angewandte Chemie international edition. Volume 61:Issue 7(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-29
• Subjects: Boron-Based Polymers -- Lithium Batteries -- Polymer Electrolytes -- Polymerizable Boron-Lithium Salts; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202114024
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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 t Li + =0.93 and electrochemical stability window of 4.2 V vs Li 0 /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). Abstract : A new family of lithium‐conducting methacrylic polymer electrolytes based on highly delocalized borate groups is discussed. The optimized borate homopolymer shows the highest ionic conductivity reported for a single‐ion conducting polymer electrolyte for lithium metal batteries.