Yttrium-tin co-doped lithium-rich manganese-based positive electrode material as well as preparation method and application thereof

The invention belongs to the technical field of battery electrodes, and particularly relates to an yttrium-tin co-doped lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The preparation method of the yttrium-tin co-doped lithium-rich manganese-based positive electrode material provided by the invention comprises the following steps: 1) mixing a nickel source, a manganese source, a lithium source, a yttrium element additive, a tin element additive, an organic solvent, an acid catalyst and water, and adjusting the pH value of the solution to 6-8 to form a gel precursor mixture; and 2) calcining the gel precursor mixture formed in the step 1) to obtain the yttrium-tin co-doped lithium-rich manganese-based positive electrode material. The yttrium-tin co-doped lithium-rich manganese-based positive electrode material prepared by the invention can effectively improve the first coulombic efficiency, the rate capability and the cycle performance of the ma