Graphene-Based Hybrid Electrode Material for High-Power Lithium-Ion Batteries

Abstract

Graphene based hybrid electrode material is fabricated from an easy and simple chemical method and is demonstrated as a cathode material for Li rechargeable batteries with high capacity and excellent rate capability. The hybrid material delivers a specific capacity of 156 mAh g(-1) at a current rate of 25 mA g(-1) (0.125 C) after 100 cycles with coulombic efficiency of nearly 100%. At elevated current rates, the specific capacity of the hybrid material is over 100 mAh g(-1) even at a current rate of 2500 mA g(-1) (similar to 12.5 C). The excellent battery performance of the hybrid material is attributed to the easy Li ion and electron transport in the amorphous FePO4/graphene hybrid structure, in which electrochemically active amorphous FePO4 films are directly grown on graphene with superior electronic conductivity.