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- W2037206264 abstract "Vanadium-doped olivine LiFePO4 cathode materials have been synthesized by a low-temperature microwave-assisted solvothermal (MW-ST) method at ≤300 °C. The samples have been extensively characterized by neutron/X-ray powder diffraction, infrared and Raman spectroscopy, elemental analysis, electron microscopy, and electrochemical techniques. The compositions of the as-synthesized materials were found to be LiFe1–3x/2Vx□x/2PO4 (0 ≤ x ≤ 0.2) with the presence of a small number of lithium vacancies (□) charge-compensated by V4+, not Fe3+, leading to an average oxidation state of ∼3.2+ for vanadium. The vacancies on the Fe site likely provide an additional conduction pathway for Li+ ions to transfer between neighboring 1D conduction channels along the crystallographic b axis. Heating the pristine 15% V-doped sample in inert or reducing atmospheres led to a loss of vanadium from the olivine lattice with the concomitant formation of a Li3V2(PO4)3 impurity phase; after phase segregation, a partially V-doped olivine phase remained. For comparison, V-doped samples were also synthesized by conventional ball milling and heating, but only ∼10% V could be accommodated in the olivine lattice in agreement with previous studies. The higher degree of doping realized with the MW-ST samples demonstrates the temperature dependence of the aliovalent-vanadium doping in LiFePO4." @default.
- W2037206264 created "2016-06-24" @default.
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- W2037206264 date "2013-02-22" @default.
- W2037206264 modified "2023-10-15" @default.
- W2037206264 title "Temperature Dependence of Aliovalent-Vanadium Doping in LiFePO<sub>4</sub> Cathodes" @default.
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- W2037206264 doi "https://doi.org/10.1021/cm303932m" @default.
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