Lithium manganate material as well as preparation method and application thereof

The invention relates to the technical field of secondary batteries, in particular to a lithium manganate material and a preparation method and application thereof. The lithium manganate material comprises a matrix, the chemical formula of the matrix is (Li1-xRx) aMn2-yMyO4-zXz, x is more than 0 and less than or equal to 0.2, a is more than 0.95 and less than or equal to 1.2, y is more than or equal to 0 and less than or equal to 0.5, and z is more than or equal to 0 and less than or equal to 0.1; r is a lithium-site doped element and is distributed on the surface layer of the matrix; m is a manganese-site doping element; x is an oxygen-site doping element. The lithium manganate material provided by the invention can effectively reduce the capacity fading in the cycle process, and has good cycle stability.