Industrial production method of nickel cobalt lithium manganite ternary positive electrode material with cycle life more than 3000 times

Abstract

The invention relates to a production technology of positive electrode materials of lithium ion batteries and particularly relates to an industrial production method of a nickel cobalt lithium manganite ternary positive electrode material with a cycle life more than 3000 times. The industrial production method comprises the following steps: (1) accurately weighing a nickel cobalt manganese hydroxide precursor with the D50 of 10.0-12.0 microns, wherein the total weight is about A tons; adding the precursor into an efficient mixer; meanwhile, accurately weighing B tons of lithium source according to a certain ratio (Li / Me) and adding the lithium source into the efficient mixer; uniformly mixing, wherein the weight ratio of A to B is (4:1) to (2:1); (2) feeding the mixture prepared by the step (1) into a sagger and conveying the sagger into a roller kiln; heating to a certain temperature at a certain speed and preserving the heat for certain time; adding the material into a cooling region, and cooling by air cooling and water cooling, wherein the cooling speed is 2.0 DEG C / min-5.0 DEG C / min, and the air inflow and the exhausting amount are accurately controlled to be 10.0m<3> / h-50.0<3> / h and 1000m<3> / h-3500m<3> / h respectively; and after discharging the mixture out of a furnace, roughly crushing and finely crushing to obtain LiNxCoyMn1-x-yO2 with the D50 of 11.0-14.0 microns, wherein x is more than or equal to 0.45 and less than or equal to 0.55 and y is more than or equal to 0.15 and less than or equal to 0.25. With the adoption of the method provided by the invention, the increasing of charge migration resistance in a circulating process can be reduced, the circulating performance of materials is improved, and more than or equal to 90% of the capacity can be kept after 2000 cycles.

Description

technical field [0001] The invention relates to a production technology of lithium-ion battery cathode materials, in particular to an industrialized production method of nickel-cobalt lithium manganese oxide ternary cathode materials with a cycle life higher than 3000 times. Background technique [0002] As an important new energy source, lithium-ion batteries are favored because of their advantages such as high energy density, no memory effect, low self-discharge rate, and no pollution. With the increasing demand for energy saving and environmental protection in recent years, the application of lithium batteries has become more and more extensive. As the core material of lithium battery cathode materials, the development prospect of this industry is very good. [0003] Lithium-ion batteries have been widely used in mobile phones, notebooks and other products, and with the promotion of new energy in the country, their applications in electric vehicles have shown explosive gr...

AI Technical Summary

Problems solved by technology

The above two methods are to coat TiO on the surface of nickel cobalt lithium manganese oxide material. 2 Afterwards, Li with excellent conductivity is formed on the surface of the material 2 TiO 3 , can isolate the contact between the material and the electrolyte, reduce the erosion of the electrolyte on the material, reduce the dissolution of transition metals, and improve the cycle performance of the material, but the cycle performance of the material after improvement is still poor, and the specific capacity is reduced. The process increases the processing cost

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