Patterns and Mechanisms of Graphene Interface Layers in Regulating Lithium-Ion Transport Pathways at the Electrode/Electrolyte Interface in Solid-State Batteries

Abstract

The development of high-energy-density solid-state batteries is an important way to solve these problems because of the unstable solid-solid interfaces, high interfacial impedance and low density. It is used to adjust the physical and chemical effects of the boundary between electrode and electrolyte. Review systematically examines the role of graphene middle layer in anode, cathode and electrolyte. We divide its main functions into three parts. At the anode end, graphene with additional functions inhibits lithium dendrite and makes the flow of Li uniform through the guidance of surface properties and structure. At the cathode end, graphene forms a mixed conductive network as a buffer layer, which reduces the burden on the interface and improves the charge movement. In electrolyte, the nano-filler of graphene improves the ion channel and enhances the mechanical strength. This series of effects laid a theoretical foundation for multi-dimensional interface optimization, and paved the way for rational design of fast-charging, durable solid-state batteries.