Lithium dendrite suppression by single-ion conducting gel polymer electrolyte cross-linked with graphene oxide
발표자
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초록
내용
This study presents the preparation of single-ion conducting gel polymer electrolytes (SGPEs) for lithium metal batteries. SGPEs were prepared via in-situ cross-linking of methacrylate-graphene oxide (MGO) and lithium cation-conducting monomer (LiMTFSI) using poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as the matrix polymer. The cross-linked SGPEs showed a highly porous structure, leading to high liquid electrolyte uptake and ionic conductivity. Compared to SGPEs without MGO cross-linker, the cross-linked SGPEs demonstrated improved mechanical, thermal, and electrochemical stability. Moreover, the cross-linked SGPEs effectively suppressed lithium dendrite growth, attributed to single-ion conducting LiMTFSI moieties and 2D MGO cross-linkers with lithiophilic moieties. As a result, lithium metal batteries with SGPEs exhibited significantly enhanced cycle performance compared to conventional Celgard-liquid electrolyte systems.