Method for preparing high-purity ternary precursor

The invention relates to the field of electrode materials and aims to solve the problems in the prior art that a process method for preparing a ternary precursor generally has problems such as high preparation cost, serous pollution and the like and that the impurity metal components are incompletely removed and the prepared ternary precursor is low in purity when the ternary precursor is preparedby taking waste batteries as raw material. With the adoption of the scheme, the method for preparing the high-purity ternary precursor comprises the following steps: 1) leaching manganese from wastebatteries by a crushing and leaching method; 2) collecting nickel and cobalt elements in the excess material in a leaching and depositing manner, and mixing with manganese-containing leaching liquor;3) further capturing and precipitating the metal impurity components by utilizing modified biomass particles; 4) further leaching and precipitating the cobalt element in the precipitate; and 5) dissolving the cobalt precipitate