LiFePO4/graphene microspheres are synthesized while avoiding the restacking of graphene sheets using a spray-drying process and a subsequent heat treatment. To determine an optimal condition for preventing the restacking of graphene sheets in the composites, we control the weight ratio of LiFePO4 to rGO. When the amount of rGO in the composite exceeds a specific amount, the rGO sheets are spontaneously restacked. The restacked rGO sheets impede the Li ion movement, which is leading to the deterioration of the electrochemical performance at high C-rates. The microspheres synthesized exhibit a high specific capacity, excellent rate capability, and good cycling stability.
Bibliographical notePublisher Copyright:
© 2017 The Korean Society of Industrial and Engineering Chemistry
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)