A kind of nickel-cobalt-manganese ternary precursor and preparation method thereof

Abstract

The invention provides a method for preparing a nickel-cobalt-manganese ternary precursor, comprising: (1) preparing nickel-containing salt, cobalt salt and manganese in a ratio of 1:1:1 according to the molar ratio of nickel, cobalt and manganese metal ions For the mixed salt solution of salt, add an oxidizing agent in the mixed salt solution, and stir evenly to obtain a mixed solution; the quality of the oxidizing agent is 0.1%-10% of the total mass of the three metal ions of nickel, cobalt and manganese in the mixed salt solution; (2 ) Add the mixed solution, lye and ammonia solution into the reaction kettle in parallel, and react at 40°C-80°C for 15h-26h to generate a slurry containing nickel-cobalt-manganese ternary precursor; (3) After the reaction, The slurry containing the nickel-cobalt-manganese ternary precursor overflows out of the reaction kettle, and after solid-liquid separation, washing and drying, the nickel-cobalt-manganese ternary precursor is obtained. The invention adds an oxidant to the mixed salt solution to oxidize part of the divalent manganese ions into trivalent manganese ions, promotes the formation of crystal nuclei, refines the primary crystal grains of the spherical precursor, and increases the specific surface area of ​​the precursor.

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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