The invention belongs to the technical field of the preparation of positive materials for
lithium-
ion batteries, and specifically provides a method for preparing a
lithium-rich positive
electrode material 2x / 3Li2MnO3*(1-x)LiMO2 through an adjustable
low temperature combustion method, wherein x is greater than 0 and smaller than 1, and M is Ni, Co and Mn. The method comprises the following steps: dissolving an Ni-Co-Mn
metal salt into a
solvent according to a stoichiometric proportion, adding a certain amount of a
reducing agent and a certain amount of an additive, stirring uniformly, dropwiseadding an appropriate amount of
ammonia water to adjust PH so as to obtain a solution A; After heating and evaporating the solution A for a certain period of time, putting the solution A in a heatingfurnace so that the
heating furnace is combusted at the temperature of 300 to 700 DEG C to obtain
powder B, collecting and
grinding the B, putting the
powder B in a
muffle furnace for
combustion for 5to 24 h at the high temperature of 700 to 1100 DEG C, and carrying out ball-milling sieving after cooling to obtain the
lithium-rich positive
electrode material. The preparation method is simple andquick, various elements in the solution can be mixed in a
molecular level, the ultrafine nanoscale material can be prepared, the
energy consumption is low, the reaction can be adjusted through parameters, the synthesizing cost of the lithium-rich positive
electrode material is greatly reduced, and the rate capability and cycle performance of the lithium-rich positive
electrode material are also obviously improved.