Boosting the Oxidative Potential of Polyethylene Glycol-Based Polymer Electrolyte to 4.36 V by Spatially Restricting Hydroxyl Groups for High-Voltage Flexible Lithium-Ion Battery Applications.

ABSTRACT: Cross-linked polyethylene glycol-based resin (c-PEGR) is constructed by a ring-opening reaction of polyethylene glycol diglycidyl ether (PEGDE) with epoxy groups and polyether amine (PEA) with amino groups. By confining the hydroxyl groups with inferior oxidative stability to the c-PEGR backbone, the oxidation potential of the PEG-based polymer material with reduced reactivity is boosted to 4.36 V. The c-PEGR based gel electrolyte shows excellent flexibility, lithium-ion transport, lithium compatibility, and enhanced oxidation stability, and is successfully applied to a 4.35 V lithium cobaltate (LCO)||lithium (Li) battery system. A quasi-static linear scanning voltammetry (QS-LSV) method is proposed for the first time to accurately measure the oxidation potential and electrochemical stabil

SUBMITTER: Fang Z 

PROVIDER: S-EPMC8373090 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature