Encapsulation of LiFePO4 by in-situ graphitized carbon cage towards enhanced low temperature performance as cathode materials for lithium ion batteries
Abstract
The severe capacity decay of LiFePO4 at low temperatures (≤0 °C) limits its wide applications as cathode materials for energy storage batteries. Creating comprehensive carbon network between particles with improved electronic conductivity is a well known solution to this problem. Here, a novel structured LiFePO4/C composite was prepared by a facile solid state route, in which nanosized LiFePO4 spheres were encapsulated by in-situ graphitized carbon cages. With the enhancement in electronic conductivity (2.15e-1 S cm-1), the composite presented excellent rate performance at room temperature and remarkable capacity retention at -40 °C, with charge transfer resistance much lower than commercial LiFePO4.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- August 2014
- DOI:
- 10.1016/j.jssc.2014.04.023
- Bibcode:
- 2014JSSCh.216....9Y