Preparation method of coated ternary nickel-cobalt-manganese lithium oxide positive electrode material

Abstract

The invention discloses a preparation method of a coated ternary nickel-cobalt-manganese lithium oxide positive electrode material. The preparation method comprises the following steps of (1) preparing a ternary nickel-cobalt-manganese lithium precursor; (2) preparing an oxide-coated ternary nickel-cobalt-manganese lithium precursor; and (3) preparing an ion conductor oxide-coated ternary nickel-cobalt-manganese lithium positive electrode material. By the preparation method of the positive electrode material, a lithium ion is easy to de-intercalate from a surface layer of the material, and thehigh-temperature circulation performance of the material is improved; a coating layer does not react with an electrolyte, interface side reaction caused by contact of the main body material and the electrolyte is reduced, and the safety of the material is improved; the processing performance of a pole plate during the uniform coating process is improved, and the high-temperature circulation performance of the material after being assembled into a battery is improved; and the prepared positive electrode material does not need to be subjected to a roasting process for two times, the energy consumption is reduced, and the cost is reduced.

Description

technical field

[0001] The invention belongs to the field of preparation of electrode materials for lithium-ion secondary batteries, and in particular relates to a method for preparing a coated ternary nickel-cobalt-manganese-manganese-lithium cathode material. Background technique

[0002] To meet the demands of electric vehicles and renewable energy storage systems, a new generation of lithium-ion batteries (LIBs) must have higher energy / power density, longer cycle life, and better safety performance. The cathode material is the limiting component of capacity. As an excellent cathode material for high-voltage LIBs with layered lithium transition metal oxides, ternary nickel-cobalt-manganese-lithium (NCM) materials combined with LiCoO 2 Compared with it, it has many advantages, such as high specific capacity, low cost, low toxicity and better safety performance. However, there is still a serious problem with NCM materials, that is, poor high-temperature cycle performance....

Images