Preparation of LiMn 2 O 4 Graphene Hybrid Nanostructure by Combustion Synthesis and Their Electrochemical Properties

The LiMn 2 O 4 graphene hybrid cathode material has been synthesized by spray drying combustion process. The spinel structure cubic phase LiMn 2 O 4 graphene hybrid material was prepared by spray drying process at 120 ℃ and subsequent heat treatment at 700 ℃ for 1 hour. The result indicates that the spinel shaped LiMn 2 O 4 particles wrapped with graphene sheets were formed with particle size in the range of 60-70 nm. The charge-discharge measurement indicates that the LiMn 2 O 4 graphene hybrid material shows an improved discharge capacity of 139 mAh/g at 0.1C rate. The pristine LiMn 2 O 4 nano crystals present only about 132 mAh/g discharge capacity. The LiMn 2 O 4 graphene hybrid samples show good cyclic performance with only 13% of capacity fading in 30 cycles when compared to the pristine LiMn 2 O 4 that shows 22% of capacity fading in 30 cycles. The capacity retention of the LiMn 2 O 4 graphene hybrid samples is about 10% higher than the pristine cycle after 30 cycles.