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Positive electrode material and preparation method and application thereof

A positive electrode material and core layer technology, applied in the field of battery materials, can solve the problems of poor discharge rate and low discharge gram capacity of high-nickel ternary materials, so as to improve the discharge voltage platform, improve high-temperature cycle and thermal stability, and increase energy effect of density

Inactive Publication Date: 2019-08-09
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single-crystal high-nickel ternary material has a low discharge gram capacity and a poor discharge rate

Method used

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  • Positive electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] A kind of preparation method of cathode material comprises the steps:

[0109] (1) Preparation of material A:

[0110] (a) Nickel sulfate, cobalt sulfate, manganese sulfate and aluminum sulfate are according to chemical formula Li 1.04 Ni 0.88 co 0.05 mn 0.05 Al 0.02 o 2 The ratio is configured, dissolved in water to obtain the nuclear layer salt solution of material A, the nuclear layer salt solution of material A is mixed with 3mol / L NaOH solution, the molar amount of NaOH in the NaOH solution is the same as the nuclear layer salt solution of material A The ratio of the total moles of metal elements in the layer salt solution is 2.1:1 to obtain the first mixed solution;

[0111] (b) mixing the first mixed solution with ammonia water, the ratio of the molar amount of ammonia water to the total molar amount of metal elements in the nuclear layer salt solution of material A is 0.5:1, the pH of the mixed product is 11.5, and then The first hydrothermal reaction at ...

Embodiment 2

[0124] A kind of preparation method of cathode material comprises the steps:

[0125] (1) Preparation of material A:

[0126] (a) Nickel nitrate, manganese nitrate, tungsten nitrate and aluminum sulfate are calculated according to the chemical formula Li 1.01 Ni 0.92 mn 0.04 W 0.01 Al 0.03 o 2 The ratio is configured, dissolved in water to obtain the nuclear layer salt solution of material A, the nuclear layer salt solution of material A is mixed with 1mol / L NaOH solution, the molar amount of NaOH in the NaOH solution is the same as the nuclear layer salt solution of material A The ratio of the total molar amounts of metal elements in the layer salt solution is 2.5:1 to obtain the first mixed solution;

[0127] (b) mixing the first mixed solution with ammonia water, the ratio of the molar amount of ammonia water to the total molar amount of metal elements in the nuclear layer salt solution of material A is 0.9:1, the pH of the mixed product is 12, and then The first hyd...

Embodiment 3

[0140] The difference from Example 1 is that the mass ratio of material A and material B in step (k) is 0.1:1.

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Abstract

The invention relates to a positive electrode material and a preparation method and application thereof. The surfaces of a core layer material A composed of secondary spherical particles and a singlecrystal particle core layer material B composed of the secondary spherical particles are coated with a shell layer material to form a material A and a material B respectively, and then the material Aand the material B are mixed, so that the energy density, the rate capability, the high-temperature cycle and the safety performance of the positive electrode material are remarkably improved. The core layer material is coated with the shell layer material, so that the residual alkali of the positive electrode material can be remarkably reduced, the oxidative decomposition of the positive electrode material on the electrolyte is reduced, and the high-temperature cycle and safety performance of the positive electrode material are improved. Compared with the prior art, a lithium ion battery obtained by the invention can achieve very good energy density, cycle performance and safety performance under higher voltage (greater than or equal to 4.2V vs (Li + / Li)). Due to the fact that the charging cut-off voltage is increased, the battery has high energy density, and the requirement of people for thinness of the lithium ion battery can be met.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a positive electrode material, a preparation method and an application thereof. Background technique [0002] Common cathode materials for lithium-ion batteries include lithium cobaltate, ternary, lithium manganate, and lithium iron phosphate. With the development of thinner electronic products and the increase in the mileage of electric vehicles, cathode materials with higher energy density have become lithium-ion batteries. research hotspot. [0003] For ternary materials, the higher the Ni content, the higher the energy density of the ternary material, but the higher the Ni content, the more serious the oxidative decomposition of the ternary material to the electrolyte, which corresponds to the high-temperature storage, high-temperature cycle and safety performance of the ternary material battery It is also worse, especially for high-nickel ternary mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 庞佩佩夏小勇占克军朱坤庆计阳楚英张涛
Owner 东莞维科电池有限公司
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