Title

Nanocomposite LiFePO4·Li3V2(PO4)3/C synthesized by freeze-drying assisted sol-gel method and its magnetic and electrochemical properties

RIS ID

119063

Publication Details

Liu, L., Xiao, W., Guo, J., Cui, Y., Ke, X., Cai, W., Liu, J., Chen, Y., Shi, Z. & Chou, S. (2018). Nanocomposite LiFePO4·Li3V2(PO4)3/C synthesized by freeze-drying assisted sol-gel method and its magnetic and electrochemical properties. Science China Materials, 61 (1), 39-47.

Abstract

Nano-sized LiFePO 4 ·Li 3 V 2 (PO 4 ) 3 /C was synthesized via a sol-gel route combining with freeze-drying. X-ray diffraction results show that this composite mainly consists of olivine LiFePO 4 and monoclinic Li 3 V 2 (PO 4 ) 3 phases with small amounts of V-doped LiFePO 4 and Fe-doped Li 3 V 2 (PO 4 ) 3 . The magnetic properties of LiFePO 4 ·Li 3 V 2 (PO 4 ) 3 /C are significantly different from LiFePO 4 /C. Trace quantities of ferromagnetic impurities and Fe 2 P are verified in LiFePO 4 /C and LiFePO 4 ·Li 3 V 2 (PO 4 ) 3 /C by magnetic tests, respectively. LiFe-PO 4 ·Li 3 V 2 (PO 4 ) 3 /C possesses relatively better rate capacities and cyclic stabilities, especially at high charge-discharge rates. The initial discharge capacities are 136.4 and 130.0 mA h g −1 , and the capacity retentions are more than 98% after 100 cycles at 2 C and 5 C, respectively, remarkably better than those of LiFePO 4 /C. The excellent electrochemical performances are ascribed to the mutual doping of V 3+ and Fe 2+ , complementary advantages of LiFePO 4 and Li 3 V 2 (PO 4 ) 3 phases, the residual high-ordered carbon and Fe 2 P with outstanding electric conductivity in the nanocomposite.

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Link to publisher version (DOI)

http://dx.doi.org/10.1007/s40843-017-9114-0