Preparation of matrix-grafted graphene/poly(poly(ethylene glycol) methyl ether methacrylate) nanocomposite gel polymer electrolytes by reversible addition-fragmentation chain transfer polymerization for lithium ion batteries

A structural design and appropriate morphology of polymer-functionalized graphene oxide are occupied to optimize nanocomposite polymer electrolytes. The nanocomposite gel polymer electrolytes (GPEs) based on poly (poly (ethylene glycol) methyl ether methacrylate and RAFT agent-functionalized graphene oxide [P(PEGMA/ GO-S-(thiobenzoyl)thioglycolic acid (STTA))] have been successfully prepared by in-situ polymerization method in different ratio of GO-STTA and crosslinking by poly(ethylene glycol) diallyl (PEGDA). The P(PEGMA/ GO-STTA) GPE with 0.5 wt% of GO-STTA exhibited a high ionic conductivity of 5.5 mS cm(-1) at room tem-perature, a superior lithium transfer number (t+) value of 0.61, and electrochemical window up 4.7 V. The GPE based P(PEGMA/GO-STTA0.5%) indicated 92% coulombic efficiency, the charge capacity value of 191.7 mAh g(-1) potential for lithium ion battery with high safety and long cycle life. , and capacity retention was about 92% after 100 cycles at 0.1C. P(PEGMA/GO-STTA) GPEs showed great potential for lithium ion battery with high safety and long cycle life.

Automated summary

A nanocomposite polymer electrolyte with optimized structural design and morphology of polymer-functionalized graphene oxide was successfully prepared. It exhibited high ionic conductivity, superior lithium ion transfer capability, and excellent electrochemical stability, making it a promising candidate for high safety and long cycle life lithium-ion batteries.