Improved electrochemical performances of 9LiFePO4·Li3V2(PO4)/C composite prepared by a simple solid-state method
✍ Scribed by J.Y. Xiang; J.P. Tu; L. Zhang; X.L. Wang; Y. Zhou; Y.Q. Qiao; Y. Lu
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 436 KB
- Volume
- 195
- Category
- Article
- ISSN
- 0378-7753
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✦ Synopsis
9LiFePO 4 •Li 3 V 2 (PO 4 ) 3 /C is synthesized via a carbon thermal reaction using petroleum coke as both reduction agent and carbon source. The as-prepared material is not a simple mixture of LiFePO 4 (LFP) and Li 3 V 2 (PO 4 ) 3 (LVP), but a composite possessing two phases: one is V-doped LFP and the other is Fe-doped LVP. The typical structure enhances the electrical conductivity of the composite and improves the electrochemical performances. The first discharge capacity of 9LFP•LVP/C in 18650 type cells is 168 mAh g -1 at 1 C (1 C 9LFP•LVP/C = 166 mA g -1 ), and exhibits high reversible discharge capacity of 125 mAh g -1 at 10 C even after 150 cycles. At the temperature of -20 • C, the reversible capacity of 9LFP•LVP/C can maintain 75% of that at room temperature.