Novel synthesis of LiFePO 4-Li 3V 2(PO 4) 3 composite cathode material by aqueous precipitation and lithiation
Abstract
LiFePO 4-Li 3V 2(PO 4) 3 composite cathode material is synthesized by aqueous precipitation of FeVO 4· xH 2O from Fe(NO 3) 3 and NH 4VO 3, following chemical reduction and lithiation with oxalic acid as the reducer and carbon source. Samples are characterized by XRD, SEM and TEM. XRD pattern of the compound synthesized at 700 °C indicates olivine-type LiFePO 4 and monoclinic Li 3V 2(PO 4) 3 are co-existed. TEM image exhibits that LiFePO 4-Li 3V 2(PO 4) 3 particles are encapsulated with a carbon shell 5-10 nm in thickness. The LiFePO 4-Li 3V 2(PO 4) 3 compound cathode shows good electrochemical performance, and its discharge capacity is about 139.1 at 0.1 C, 135.5 at 1 C and 116 mA h g -1 at 3 C after 30 cycles.
- Publication:
-
Journal of Power Sources
- Pub Date:
- 2010
- DOI:
- 10.1016/j.jpowsour.2009.11.006
- Bibcode:
- 2010JPS...195.2935Z
- Keywords:
-
- Lithium ion battery;
- Cathode material;
- FeVO <SUB>4</SUB>;
- LiFePO <SUB>4</SUB>-Li <SUB>3</SUB>V <SUB>2</SUB>(PO <SUB>4</SUB>) <SUB>3</SUB>