For citation:
Rybakov K. S., Ushakov A. V. High-voltage Cathode Material Based on LiCoVO? for Lithium-Ion Battery: Development and Research. Electrochemical Energetics, 2019, vol. 19, iss. 2, pp. 90-?. DOI: 10.18500/1608-4039-2019-19-2-90-104, EDN: DLTQMI
High-voltage Cathode Material Based on LiCoVO? for Lithium-Ion Battery: Development and Research
This paper discusses the prospects for developing a cathode material based on the cobalt(II)-lithium vanadate(V) (LiCoVO4) for a lithium-ion battery, an approach to its preparation and features of the electrochemical behavior.
We obtained LiCoVO4 using solid-phase synthesis technology with preliminary mechanical activation of the mixture of starting materials. The highest specific cathode capacity in the first cycle was demonstrated by the sample obtained by heat treatment at 700°C for 12 hours – 44 mA?h?g ? 1. The reasons for the unattainability of the theoretical level of the specific discharge capacity (148 mA?h?g ? 1) and for its degradation are associated with the features of the crystal structure and the increase in the ohmic resistance at the interface of the electrode material/electrolyte, respectively. The diffusion stages of electrode processes for the extraction of lithium from this material and its reverse insertion are characterized by the values of the diffusion coefficient, moderate for the solid ionic conductors.
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