Ni-Co-Mn ternary precursor and preparation method thereof

Abstract

The invention provides a preparation method of a Ni-Co-Mn ternary precursor. The preparation method comprises the steps of (1) preparing a mixed salt solution containing a nickel salt, a cobalt salt and a manganese salt according to a proportion that the mole ratio of nickel ions, cobalt ions and manganese ions is 1:1:1, adding an oxidizing agent into the mixed salt solution, and obtaining a mixed solution after uniform stirring, wherein the mass of the oxidizing agent accounts for 0.1-10% of the total mass of the nickel ions, the cobalt ions and the manganese ions in the mixed salt solution; (2) combining and adding the mixed solution, an alkali liquid and an ammonia solution into a reaction kettle, and performing reaction for 15-26 hours under 40-80 DEG C to generate paste containing the Ni-Co-Mn ternary precursor; and (3) allowing the paste containing the Ni-Co-Mn ternary precursor to overflow out of the reaction kettle after reaction finishes, and obtaining the Ni-Co-Mn ternary precursor after solid-liquid separation, washing and drying. The oxidizing agent is added into the mixed salt solution, so that a part of divalent manganese ions are oxidized to trivalent manganese ions, the formation of a crystal nucleus is facilitated, the primary crystal gain of a spherical precursor is refined, and the specific area of the precursor is expanded.

Description

technical field [0001] The invention relates to the technical field of battery material preparation, in particular to a nickel-cobalt-manganese ternary precursor and a preparation method 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 bicycles, electric vehicles, national defense 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. With the development of power batteries in electric vehicles, due to the low energy density of lithium iron phosphate and lithium manganese oxide, they cannot meet their requirements. Lithium nickel cobalt manganese oxide has the advantages of high specific capacity, good thermal stability and low price. It is the most potential ...

AI Technical Summary

Problems solved by technology

Due to the inheritance of the positive electrode material to the precursor, the primary particles of the fired nickel-cobalt lithium manganate (LNCM) positive electrode material are also large, the specific surface area is small, and the contact area with the electrolyte is also small during application. Cobalt-manganese ternary precursors cannot meet the requirements of high-rate charge-discharge performance of power batteries

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