Improved electrochemical performances of 9LiFePO4·Li3V2(PO4)/C composite prepared by a simple solid-state method |
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Authors: | J.Y. Xiang L. Zhang X.L. Wang Y. Zhou Y.Q. Qiao Y. Lu |
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Affiliation: | State Key Laboratory of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, Zheda Road, No. 38, Hangzhou 310027, Zhejiang, China |
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Abstract: | 9LiFePO4·Li3V2(PO4)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 LiFePO4 (LFP) and Li3V2(PO4)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 C9LFP·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. |
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Keywords: | Lithium metal phosphate Composite Cathode Lithium ion battery |
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