Preparation method of precursor of lithium nickel cobalt manganese oxide material

Abstract

The invention relates to the field of lithium nickel cobalt manganese oxide materials and particularly relates to a preparation method of a precursor of a lithium nickel cobalt manganese oxide material. The preparation method comprises the following steps: (1) adding a mixed water solution of sulfates in the molar ratio of nickel ions to magnesium ions to cobalt ions being 5 to 3 to 2 into a synthesis reaction kettle with an ultrasonic device, introducing protective gas, simultaneously adding an alkaline precipitant and a metal complexing agent which are capable of precipitating the metal ions and regulate the pH value of the solution to be 11 which is constant, and performing filtration and ultrasonic washing to obtain slurry; (2) adding the slurry into a stirring reaction kettle, adding the mixed water solution of the sulfates in the molar ratio of nickel ions to magnesium ions to cobalt ions being 1 to 1 to 1, introducing the protective gas, simultaneously adding the alkaline precipitant and the metal complexing agent which are capable of precipitating the metals ions and regulate the pH value of the solution to be 11 which is constant, washing a precipitate and performing vacuum drying; and (3) sintering. The lithium nickel cobalt manganese oxide material prepared by utilizing the precursor of the lithium nickel cobalt manganese oxide material provided by the invention has the advantages of high tapping density, good processing performance and excellent electrochemical properties.

Description

technical field [0001] The invention relates to the field of nickel-cobalt lithium manganese oxide material, in particular to a preparation method of a nickel-cobalt lithium manganese oxide material precursor. Background technique [0002] Lithium-ion battery cathode material is the most critical part of the battery. The current lithium-ion battery cathode materials on the market mainly include lithium cobaltate, lithium manganate, lithium ferrous phosphate and nickel-cobalt-manganese ternary system. Among them, lithium cobaltate, lithium iron phosphate and nickel-cobalt-manganese ternary system are the mainstream materials. Due to the severe scarcity of cobalt resources, high price, and potential safety hazards during overcharging, the application of lithium cobalt oxide in large-capacity batteries is greatly restricted. Although the layered lithium manganate has a specific capacity of 200mAh·g-1, its structural stability is very poor, while the specific capacity of the sp...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a kind of high tap density, good sphericity, which can overcome the existing single LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The material capacity is low, a single LiNi 0.5 co 0.2 mn 0.3 o 2 Preparation method of nickel cobalt lithium manganese oxide material precursor with poor material cycle performance