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Li4P2O7 modified high performance Li3V2(PO4)3 cathode material
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DOI：10.1039/c2jm31149f.png)
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Li3V2(PO4)(3) was prepared from a stoichiometric and a non-stoichiometric set of precursors. The non-stoichiometric preparation led to particles coated with a thin layer (<5 nm) of Li4P2O7 and Li3PO4 (G-LVPO), as verified through high resolution transmission electron microscopy and slow scan X-ray diffraction. The stoichiometric material was bare (B-LVPO), i.e. no film was present, as confirmed by the same techniques. Amorphous and crystalline Li3V2(PO4)(3) will co-exist when the synthesis temperature ranges from 700 degrees C to below 900 degrees C. The Li3V2(PO4)(3) phase will completely crystallize and particles grow bigger than 300 nm when the synthesis temperature reaches to or higher than 900 degrees C. Cyclic voltammetry plots of B-LVPO and G-LVPO show that they undergo the same phase transitions between 3.0 V and 4.3 V and preserve a good structural stability over cycled in the range from 3.0 V to 4.8 V. G-LVPO has a smaller ohmic/charge transfer resistance compared with B-LVPO, which enables a better rate capability and cycling ability of G-LVPO than B-LVPO. In this report we were able to determine that the non-stoichiometric chemistry leads to a coating of Li4P2O7 and Li3PO4 on the Li3V2(PO4)(3) and that the coating appears to improve the rate capability and the cycling ability of the material.
Keyword:
LITHIUM VANADIUM PHOSPHATE
LI-ION BATTERIES
DOPED LI3V2(PO4)(3)
LIFEPO4
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