A kind of fluorine-doped nickel-cobalt-manganese precursor and its preparation method and application

Abstract

The invention provides a fluorine-doped nickel-cobalt-manganese precursor and a preparation method and application thereof. The method comprises the steps of preparing first mixed liquid containing anickel salt and a cobalt salt from soluble salts of nickel and cobalt; preparing second mixed liquid from a soluble salt solution of manganese and a soluble fluoride complexing agent under the condition of introducing a protective gas; carrying out forward feeding of the first mixed liquid, the second mixed liquid, a sodium hydroxide solution and an aqueous ammonia solution into a reactor with anultrasonic device, keeping the temperature at 50-60 DEG C and mixing at a speed of 500-800r / min until reaction is ended, carrying out aging and solid-liquid separation and then obtaining sediments; and washing and drying the obtained sediments to obtain a fluoride ion-doped nickel-cobalt-manganese precursor. The obtained precursor material has a sphere-like structure, the specific surface area is5.6-6.3m<2> / g, the tap density is 2.2-2.7g / cm<3> and the obtained positive electrode material is good in electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of battery material preparation, in particular to a fluorine-doped nickel-cobalt-manganese precursor and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy, long life, no memory effect and low pollution, and are widely used in mobile phones, computers, electric vehicles and other fields. At present, the positive electrode materials used in lithium-ion batteries mainly include lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide, and nickel-cobalt lithium manganese oxide. Among them, the positive electrode material with the largest market share is lithium cobaltate, but cobalt is a strategic resource with few reserves and is expensive, and the safety performance of lithium cobaltate is poor, which limits the further development of this material. Lithium nickel cobalt manganese oxide has the advantages of high s...

AI Technical Summary

Problems solved by technology

[0004] However, it is difficult to synthesize nickel-cobalt-manganese hydroxide precursors by the traditional co-precipitation method, mainly because the precipitation concentration product of manganese ions is several orders of magnitude different from the precipitation concentration product of nickel and cobalt elements. The precipitation speed with hydroxide is very fast, and it is easy to form flocculent precipitation, which makes it difficult to grow the precursor particle size, and the prepared precursor has low tap density, poor sphericity, small particle size, and is difficult to clean, etc.