Synthesis and Electrochemical Studies of Spinel LiNi_1-xMn_xVO₄

Author： Lai Q.Y. Lu J.Z. Su X.B. Ji X.Y.

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.165, Iss.2, 2002-05, pp. : 312-316

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Abstract

Spinel compound LiNi_1-xMn_xVO₄ (0≤x≤0.4) had been prepared by using the moist chemical method. X-ray diffraction spectra showed that the lattice constant increased with x in the LiNi_1-xMn_xVO₄, XPS spectra indicating that Li1s had a chemical shift towards lesser binding energy, and manganese in LiNi_1-xMn_xVO₄ existing as the mixed valence of Mn²⁺ and Mn³⁺. The electrochemical charge and discharge testing at a current density of 0.1 mA/cm² between the potentials of 4.0 and 3.0 V vs Li/Li⁺ in 1 mol/dm³ LiPF₆/EC+DEC (1:1 by volume) at 25°C showed that LiNi_1-xMn_xVO₄ cell has a better rechargeability, but a lower cell voltage of 4.0 V vs Li/Li⁺ than that without the doping sample, and the capacity and the cycle efficiency of the Li/LiNi_1-xMn_xVO₄ cells increased with x in the LiNi_1-xMn_xVO₄. © 2002 Elsevier Science (USA).