Preparation method of mixed lithium nickel cobalt aluminate positive electrode material

A technology of lithium nickel cobalt aluminate and positive electrode materials, which is applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of product performance degradation, poor material electrical properties and processing performance, and low compaction density, and achieve improvement Consistency, improving compaction density and rate performance, reducing the effect of surface residual alkali

Inactive Publication Date: 2020-08-11
陕西红马科技有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

The above preparations are for the preparation of nickel-cobalt lithium aluminate cathode materials with a single particle size or a relatively narrow particle size distribution, and there are problems such as low compaction density and low capacity ratio.
Directly prepare nickel-cobalt lithium aluminate or mix large and small particles into nickel-cobalt lithium aluminate positive electrode material through one-time sintering, there are problems such as high alkali content, poor electrical properties and processing performance of the material, which will eventually lead to a decline in product performance and cannot achieve the expected optimization and improvement. The problem of the purpose, but also the problem of high alkali content and poor material processing performance

Method used

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  • Preparation method of mixed lithium nickel cobalt aluminate positive electrode material
  • Preparation method of mixed lithium nickel cobalt aluminate positive electrode material
  • Preparation method of mixed lithium nickel cobalt aluminate positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1. The specific preparation steps of the large-grain nickel-cobalt-lithium-aluminate cathode material are as follows:

[0033] (1) Weigh Ni with D50=16μm 0.88 co 0.10 Al 0.02 (OH) 2 Precursor A 2000g, weigh lithium hydroxide 992g according to the molar ratio of lithium salt to precursor A as 1.1, weigh 1.844g of strontium oxide according to the molar ratio of doping compound and precursor A as 0.0008, and weigh 2000g of D50= 16μm Ni 0.88 co 0.10 Al 0.02 (OH) 2 The precursor A was mixed with 992g of lithium hydroxide and 1.844g of strontium oxide, and oxygen with a purity of 90% was introduced. First, the temperature was raised to 550°C at 3°C / min, kept for 4 hours, and then raised to 750°C at 2°C / min. ℃, heat preservation for 9 hours, then naturally cool down to room temperature, pulverize, and sieve to obtain the primary nickel-cobalt-lithium-aluminate positive electrode material;

[0034] (2) According to the initial nickel-cobalt-lithium-aluminate positive el...

Embodiment 2

[0044] 1. The specific preparation steps of the large-grain nickel-cobalt-lithium-aluminate cathode material are as follows:

[0045] (1) Weigh Ni with D50=20μm 0.92 co 0.06 Al 0.02 (OH) 2 Precursor A 2000g, weigh lithium hydroxide 970g according to the molar ratio of lithium salt to precursor A as 1.074, weigh magnesium carbonate 5.583g according to the molar ratio of doping compound and precursor A as 0.0027, and take 2000g of D50= 20μm Ni 0.92 co 0.06 Al 0.02 (OH) 2 The precursor A was mixed with 970g of lithium hydroxide and 5.583g of magnesium carbonate, and oxygen with a purity of 97% was introduced. First, the temperature was raised to 500°C at 3°C / min, kept for 4 hours, and then raised to 730°C at 2°C / min. ℃, heat preservation for 12 hours, then naturally cool down to room temperature, crush, and sieve to obtain the primary nickel-cobalt-lithium-aluminate positive electrode material;

[0046] (2) According to the initial nickel-cobalt-lithium-aluminate positive...

Embodiment 3

[0055] 1. The specific preparation steps of the large-grain nickel-cobalt-lithium-aluminate cathode material are as follows:

[0056] (1) Weigh Ni with D50=10μm 0.83 co 0.155 Al 0.025 (OH) 2 Precursor A 2000g, weigh lithium hydroxide 903g according to the molar ratio of lithium salt and precursor A as 1.0, weigh 2.461g of yttrium oxide according to the molar ratio of doping compound and precursor A as 0.0005, and weigh 2000g of D50= 10μm Ni 0.83 co 0.155 Al 0.025 (OH) 2 Precursor A was mixed with 903g of lithium hydroxide and 2.461g of yttrium oxide, and oxygen with a purity of 99.9% was introduced. First, the temperature was raised to 590°C at 3°C / min, kept for 4 hours, and then raised to 780°C at 2°C / min. , heat preservation for 20 hours, then naturally cool down to room temperature, crush, and sieve to obtain the initial nickel-cobalt-lithium-aluminate positive electrode material;

[0057] (2) Mix the initial nickel-cobalt-lithium-aluminate cathode material with pur...

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Abstract

The invention discloses a preparation method of a mixed lithium nickel cobalt aluminate positive electrode material. The preparation method of the mixed lithium nickel cobalt aluminate positive electrode material is obtained by uniformly mixing a large-particle lithium nickel cobalt aluminate positive electrode material and a small-particle lithium nickel cobalt aluminate positive electrode material in a mass ratio of (1-8): 1, the particle size range of the large-particle-size lithium nickel cobalt aluminate positive electrode material is D50 = 10-20 [mu] m, and the particle size range of thesmall-particle-size lithium nickel cobalt aluminate positive electrode material is D50 = 2-7 [mu] m. The chemical formula of the mixed lithium nickel cobalt aluminate cathode material is LiNixCoyAlzMaO2, wherein x + y + z + a = 1, x is more than 0.8 and less than 1, y is more than 0.01 and less than 0.2, z is more than 0.01 and less than 0.1, and a is more than 0.001 and less than 0.01. Accordingto the present invention, the bulk phase doping, the water washing and the surface coating are respectively performed on the large-particle size lithium nickel cobalt aluminate particles and the small-particle size lithium nickel cobalt aluminate particles, and then the mixing is performed, such that the residual alkali on the surface of the lithium nickel cobalt aluminate is reduced, the consistency and the processability of the material are improved, and the compaction density and the rate performance of the positive electrode material are improved.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a preparation method of a mixed nickel-cobalt lithium aluminate positive electrode material. Background technique [0002] Lithium-ion batteries have many advantages such as light weight, small size, high capacity, long cycle life, and no memory effect, so they are widely used in mobile phones, notebook computers, new energy vehicles and other equipment. In the practical application of lithium-ion batteries, the main pursuit is to reduce its production cost and improve its overall performance, including high energy density and power density, long cycle and safety performance. Among them, the positive electrode material accounts for about 40% of the production cost of lithium-ion batteries, and is also the key to improving the overall performance of lithium-ion batteries. Its performance determines the main performance ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCH01M4/364H01M4/525H01M4/485H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 高彦宾
Owner 陕西红马科技有限公司
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