PROTECTIVE SPINEL COATING FOR Ni-Mn-Co (NMC) CATHODE WITH HIGH Li CONTENT FOR LITHIUM-ION BATTERIES, METHOD OF APPLYING SAID COATING ON CATHODE AND CATHODE WITH SAID COATING Russian patent published in 2019 - IPC H01M4/50 H01M10/525 

FIELD: electricity.

SUBSTANCE: invention relates to protective spinel coatings for cathodes of high-energy lithium-ion batteries and method of their application using a single precursor. According to the invention, the protective spinel coating for a Ni-Mn-Co (NMC) cathode with high Li content is LiM_0.5Mn_1.5O₄, where M is a transition metal. According to a preferred embodiment, the spinel is LiCo_0.5Mn_1.5O₄, and cathode material, on which coating is applied, is Li_1.16Ni_0.17Mn_0.5Co_0.17O_2. Method of applying a protective spinel coating involves the following steps: (a) providing a single molecular precursor of spinel of formula LiMn_2-xM_x(thd)₅, where M is a transition metal, 1/2≤x≤1, and thd is 2,2,6,6-tetra-methyl-3,5-heptanedionate; (b) dissolving precursor in aprotic solvent; (c) depositing the dissolved precursor on the surface of the substrate; and (d) annealing the substrate from step (c) with a precursor deposited on said substrate in air at a temperature of about 400 to 600 °C to obtain a protective spinel coating on the surface of the substrate.

EFFECT: long-term improvement of container retention and stress for coated cathode.

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