LiCoO2 Cathode Modified With Liquid-exfoliated Graphene for High-performance Full Batteries

Abstract

Abstract Graphene has been successfully applied for modification of LiCoO2 cathode, but finding a large-scale preparation method of high-quality graphene for commercial application remains a great challenge. In this work, we have demonstrated a facile strategy to prepare few-layer defect-free graphene. The prepared graphene performs well in application for LiCoO2 cathode in the full battery system as conductive additives. The superior conductive graphene is attached to LiCoO2 particles, and fast pathways of electronic transport in the bulk electrode and protective layer on the interface between LiCoO2 and electrolyte are constructed. The cathode with 0.35% wt% graphene displays superior rate capacity (145 mAh/g at 2C) and excellent 4.5 V high-voltage cycle performance, which can be contributed to lower internal resistance and a more stabilized interface. The graphene shows great potential in commercial applications for high-performance LiCoO2-based full batteries.