Coating method of high-nickel ternary material

Abstract

The invention discloses a coating method of a high-nickel ternary material. The coating method comprises the following steps of S1, primary sintering, wherein after a high-nickel ternary precursor ismixed with a lithium hydroxide raw material according to a ratio, the mixture is subjected to heat preservation for 5-12 h in the range of 750-890 DEG C under the oxygen introduction condition, and after the temperature is reduced to 400 DEG C or below under the oxygen introduction condition, the mixture is naturally cooled and subjected to coarse crushing to obtain a once-sintered high-nickel ternary material; S2, coating, wherein superfine electrolytic manganese dioxide serves as a coating agent and is fully mixed with the once-sintered product in S1; moisture preservation is carried out onthe mixed material at 650-750 DEG C in the air atmosphere, and a high-nickel ternary material finished product is obtained. A brand new coating mode is utilized, residual alkali on the surface of thematerial is reduced, and high-temperature deoxygenization is inhibited, so that the electrochemical performance and process processing performance of a nickel-cobalt lithium manganate material are improved.

Description

technical field [0001] The invention relates to a coating method of a high-nickel ternary material. Background technique [0002] Nickel cobalt lithium manganese oxide material, known as ternary material in the industry, chemical general formula LiNi x mn y co z o 2 (x+y+z=1), as the positive electrode material of lithium-ion batteries, is widely used in the fields of communication, electric tools, electric bicycles and electric vehicle power batteries. For the production method of nickel-cobalt-manganese lithium manganate material, the mainstream synthesis method in the industry is the high-temperature solid-phase method, which not only selects solid compounds such as lithium oxides or carbonates, but also combines them with hydroxides of nickel-cobalt-manganese (ternary precursors) ) are mixed evenly, and reacted to generate nickel-cobalt-lithium manganese oxide material by high-temperature burning. [0003] Nickel cobalt lithium manganate material LiNi x mn y co z...

AI Technical Summary

Problems solved by technology

[0003] Nickel cobalt lithium manganate material LiNi x mn y co z o 2 In (x+y+z=1), the value of x is higher than 0.6, which is generally called high-nickel ternary material, and there are two main reasons that restrict the wide application of high-nickel ternary material, one is the residual alkali on the surface of the material High, the PH value is too high, and the second is that it is easy to lose oxygen in the high temperature reaction and cause the structure to be unstable

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