Monocrystal Ni-Co-Mn battery positive pole material and preparing method thereof

Abstract

The invention relates to a monocrystal Ni-Co-Mn battery positive pole material and a preparing method thereof and belongs to the technical field of energy materials. The chemical formula of the monocrystal Ni-Co-Mg battery positive pole material is LiNixCoyMn1-x-yO2, wherein 0.3 < x < 0.8, and 0.1 < y < 0.4. The preparing method of the monocrystal Ni-Co-Mn battery positive pole material comprises the following steps: (1) preparation of seed crystals: adding amino water of which the concentration is 0.5-1.5 mol / L to a carbonate or acetate solution of Ni-Co-Mn; then adding a 1-4 mol / L of LiOH solution; standing, filtering and drying; mixing with LiOH.H2O and forging; (2) preparation of a precursor: adding amino water of which the concentration is 0.5-1.5 mol / L to a carbonate or acetate solution of Ni-Co-Mn, and adding a 1-4 mol / L of LiOH solution; standing, ageing and vacuum drying; (3) preparation of the monocrystal Ni-Co-Mn battery positive pole material through sintering: mixing the precursor with a lithium source and the seed crystal according to a stoichiometric ratio, compacting into a block form, sintering, cooling and pulverizing. The monocrystal Ni-Co-Mn battery positive pole material and the preparing method thereof have the advantages of simplicity in operation, easiness in the control of grain size, narrow grain size distribution range, high product purity, excellent circulating performance, excellent safety performance and the like.

Description

Technical field [0001] The invention belongs to the technical field of energy materials, and particularly relates to a single crystal nickel-cobalt-manganese battery cathode material and a preparation method thereof. Background technique [0002] At present, the cathode material of nickel-cobalt-manganese ternary composite oxide powder is mainly used as the cathode material of lithium-ion batteries, and has advantages that other cathode materials cannot match. Lithium cobaltate is not suitable as a positive electrode material for power lithium-ion batteries due to its high price, poor safety performance and high toxicity. Lithium iron phosphate has the advantages of low price, good safety performance, and environmental friendliness, but its energy density per unit volume is low. Lithium manganate has the advantages of low cost, good safety performance, and less environmental pollution, but its cycle performance is poor and the energy density per unit volume is low. In compariso...

AI Technical Summary

Problems solved by technology

This method can easily control the particle size of the product by controlling the precipitation conditions, but the large particle materials prepared are often spherical microcrystalline particles, not single crystal particles

Due to the inhomogeneity of the particles formed by the combination of multiple particles, the particle size distribution range is wide, and many small particles will fall off from the surface of the large particles during the process of preparing battery pole pieces, resulting in poor product stability.

Especially when the compaction density of the battery pole piece is high, it is easy to crush the spherical microcrystalline particles, resulting in technical problems such as battery quality degradation

Images