The invention relates to a
spinel nickel manganese acid
lithium and layered
lithium-rich
manganese-based
composite cathode material with a core-shell structure and a preparation method thereof, which belongs to the technical field of
material synthesis. The prepared
lithium ion composite cathode material takes a layered lithium-rich
manganese-based Li[Lia(NixCoyMnz)]O2 as a core material, takes
spinel nickel manganese acid lithium LiNi0.5Mn1.5O4 as a shell material; a
coprecipitation method is employed to obtain a core-shell precursor, the core-shell precursor and the lithium source are uniformly mixed and calcined to obtain the
spinel nickel manganese acid lithium and layered lithium-rich manganese-based
composite cathode material with the core-shell structure. According to the invention, the layered lithium-rich manganese-based is taken as the core material, and the spinel nickel manganese acid lithium is taken as the shell material; under the prerequisite that material
gram capacity is kept, material
structural stability is increased,
material cycle, multiplying power and safety performances are improved, function composite and
complementation of the core material and the shell layer material can be realized, and the problem that high capacity and
high security can not be achieved simultaneously is solved. The composite
cathode material has the advantages of simple process and obviously increased performance.