Provided are a cobalt-free layered positive electrode material and a method for preparing same, and a lithium-ion battery. The method comprises: preparing a layered lithium nickel manganese oxide base material; mixing the layered lithium nickel manganese oxide base material and a coating agent to obtain a first mixed material; performing first sintering treatment on the first mixed material to form a coating layer on the surface of the layered lithium nickel manganese oxide base material, so as to obtain the cobalt-free layered positive electrode material, wherein the coating agent comprises a first coating agent and a second coating agent, the first coating agent comprises a ceramic oxide, and the second coating agent comprises at least one of a phosphate and a silicate.