Inorganic Filler Graphene Oxide  Composited Gel Polymer Electrolyte  Inducing Optimal Solvation Structure of Li+ For Long-Life Metal Lithium Battery

Abstract

Lithium metal (LM) is a highly promising anode material for next-generation Li-ion electrochemical energy storage devices. However, the issues of lithium dendrite growth and unstable interfaces (solid electrolyte interphase (SEIs)) continue to impede the practical implementation of this technology. In this paper, a composited gel polymer electrolyte (GPE) with monolayer graphene oxide (GO) as the inorganic filler well dispersing in cellulose matrix is investigated for realizing high-performance lithium metal batteries (LMBs). It was experimentally demonstrated that the addition of GO not only accelerated the Li+ transport, but also to regulate the solvated sheath structure of Li+ ions, thereby facilitating the formation of the LiF interfacial phase. The composited GPE here can well induce the uniform deposition of Li and efficiently inhibit the growth of lithium dendrites. The GPE-based LiFePO4 full batteries showed a high capacity retention rate of 98.7% after 300 cycles at 0.5C and 99.3% after 300 cycles at 1C. The use of inorganic fillers GO composite gel electrolytes can provide a better way of thinking.

Keywords: GO, composite gel electrolyte, lithium ion solvated structures, Lithium metal batteries, stable SEI