Preparation method of high-nickel, low-cobalt and low-manganese ternary positive electrode material precursor for lithium battery

Abstract

The invention relates to a lithium battery preparation material, and provides a preparation method of a high-nickel, low-cobalt and low-manganese ternary positive electrode material precursor for a lithium battery. The shape and the appearance of nickel, cobalt and manganese hydroxide co-precipitated product can be precisely and conveniently controlled. A raw material solution is prepared from A, namely a nickel salt solution containing 80g / L of nickel, B, namely a mixed solution containing 60-90g / L of nickel, 10-30g / L of cobalt and 10-30g / L of manganese (prepared according to different proportions of x and y in nickel, cobalt and manganese hydroxide Ni(1-x-y)CoxMny(OH)2, wherein x is greater than or equal to 0.1 and smaller than or equal to 0.25, y is greater than or equal to 0.1 and smaller than or equal to 0.25, x+y is greater than or equal to 0.2 and smaller than or equal to 0.5), C, namely a solution containing 8mol / L of sodium hydroxide, and D, namely a solution containing a surface active dispersing agent. A preparation method comprises the steps of nickel hydroxide seed crystal cultivation, crystal particle maturing, slurry aging, precipitate filtering, washing and drying. Compared with the prior art, the preparation method has the advantages that ammonia water does not need to be added in the whole process including cultivation and confirmation of Ni(OH)2 crystals, so that high ammonia-nitrogen wastewater cannot be produced; the working procedure of treating the ammonia-nitrogen wastewater is omitted, so that the production cost is further lowered.

Description

technical field [0001] The invention relates to a lithium battery manufacturing material, in particular to a preparation method of a precursor of a lithium ion battery ternary cathode material. Background technique [0002] Lithium-ion batteries are a new generation of green energy storage batteries. They have outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge, and no memory effect. They have been widely used in mobile phones, notebook computers, energy storage and other electronic products. . [0003] The positive electrode material is the key component material of lithium-ion batteries, and it is the part with the largest cost in lithium-ion batteries. Lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMnO 2 ), lithium nickelate (LiNiO 2 ), nickel-cobalt-manganese (1:1:1, 5:2:3 or 4:3:3) lithium oxide, lithium nickel-cobalt aluminate, lithium iron phosphate, etc. As one of the most widely used cathode mate...

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Problems solved by technology

[0007] Although it is possible to prepare spherical nickel-cobalt-manganese hydroxide with the above two methods, the process cannot be precisely controlled, and the sphericity of the product cannot be guaranteed, and ammonia water is used in both methods, resulting in a bad operating environment. After the sediment is separated, the mother liquor Ammonium nitrogen ions are contained in the water, and the treatment cost of wastewater containing ammonia nitrogen is increased, etc.

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