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Preparation method of high-nickel positive electrode material for lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as damage, poor cycle performance, and attenuation of material cycle performance, and achieve inhibition of precipitation, good crystallinity, and improved stability sexual effect

Inactive Publication Date: 2019-03-12
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiOH and Li on the surface of high-nickel cathode materials can be removed by water washing process 2 CO 3 Wash it off, but the washing process will cause the lithium in the internal lattice of the material to dissolve into the aqueous solution after washing, so that the internal structure of the material will be damaged and the cycle performance of the material will be seriously attenuated.
[0005] Due to the above-mentioned defects and deficiencies, there is an urgent need in this field to further improve and improve the surface modification method of high-nickel cathode materials, so as to solve the problem of poor cycle performance in the process of charging and discharging.

Method used

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  • Preparation method of high-nickel positive electrode material for lithium ion battery
  • Preparation method of high-nickel positive electrode material for lithium ion battery
  • Preparation method of high-nickel positive electrode material for lithium ion battery

Examples

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Effect test

Embodiment 1

[0045] (1) Configure a salt solution with a concentration of 2mol / L, in which the molar ratio of nickel sulfate, cobalt sulfate and manganese sulfate is 88:9:3, and configure the alkali into an alkali solution with a concentration of 3mol / L; configure the complexing agent into 1mol / aqueous ammonia solution;

[0046] (2) Add the salt solution, alkali solution and complexing agent solution together into the reaction kettle for reaction, keep the stirring speed constant during the process, pass an inert atmosphere of argon for protection, and control the reaction pH to 11.8 and the reaction temperature to 45 ℃, the concentration of the complexing agent ammonia water in the reaction system is controlled to 3g / L, when the reaction is completed, stop the liquid feeding, keep the temperature of the reaction liquid and the stirring speed constant, and continue to stir for 120min to obtain the hydroxide precursor slurry;

[0047] (3) After the hydroxide precursor slurry in step (2) is ...

Embodiment 2

[0052] (1) Prepare a salt solution with a concentration of 1.5mol / L, in which the molar ratio of nickel sulfate, cobalt sulfate and manganese sulfate is 83:10:7, and configure the alkali into an alkali solution with a concentration of 2mol / L; Configured as 3mol / ammonia solution;

[0053] (2) Put the salt solution, alkali solution and complexing agent solution together into the reaction kettle for reaction, keep the stirring speed constant during the process, pass an inert atmosphere of argon for protection, and control the reaction pH to 12.3 and the reaction temperature to 55 °C, the concentration of the complexing agent ammonia water in the reaction system is controlled to 2g / L. When the reaction is completed, stop the liquid feeding, keep the temperature of the reaction liquid and the stirring speed constant, and continue stirring for 120min to obtain the hydroxide precursor slurry.

[0054] (3) After the hydroxide precursor slurry in step (2) is subjected to solid-liquid ...

Embodiment 3

[0059] (1) Configure a salt solution with a concentration of 2.5mol / L, in which the molar ratio of nickel sulfate and cobalt sulfate is 88:9, prepare the alkali solution and aluminum nitrate solution to form a 0.2mol / L aluminum solution, and configure the alkali to a concentration of It is a 3mol / L alkali solution; the complexing agent is configured into a 1mol / L ammonia solution;

[0060] (2) Put the salt solution, aluminum solution, alkali solution, and complexing agent solution together into the reaction kettle for reaction, keep the stirring speed constant during the process, pass an inert atmosphere of argon for protection, and control the reaction pH to 12.6 at the same time. The temperature is 50°C, and the concentration of the complexing agent ammonia water in the reaction system is controlled at 3g / L. When the reaction is completed, stop feeding the liquid, keep the temperature of the reaction liquid and the stirring speed constant, and continue stirring for 120 minute...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and discloses a preparation method of a high-nickel positive electrode material for a lithium ion battery. The preparation method provided by the invention comprises the following steps: (1) preparing salt, alkali and complexing agent solutions; (2) adding the salt, alkali and complexing agent solutions to a reaction kettle in a cocurrent flow for reaction; (3) cleaning and drying to obtain a required precursor; (4) mixing the precursor with a lithium source and sintering at a time; (5) cleaning with a special washing liquid, filtering and rinsing; and (6) coating and returning to sinter to obtain the high-nickel positive electrode material for the lithium ion battery. According to the method provided by the invention, the high-nickel positive electrode material is first cleaned in the special washing liquid, a coating compound is mixed, and then an oxygen is used for sintering to disperse lithium inside thematerial uniformly; with such a method, while residual alkali on a surface of the material can be cleaned, the separation of internal lattice lithium is reduced, and the stability of an internal structure of the material is increased; and thus, the room-temperature and high-temperature cycling stability of the high-nickel material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, in particular to a method for preparing a high-nickel positive electrode material. Background technique [0002] Among the cathode materials for lithium-ion batteries, layered ternary composite cathode materials such as LiNi x co y mn z o 2、 LiNi x co y Al z o 2 (where x+y+z=1, 0<x<1, 0<y<1, 0<z<1), the ternary layered composite material is LiCoO 2 , LiNiO 2 , and LiMnO 2 or LiAlO 2 The solid solution combines the advantages of the three materials, and has the advantages of high specific capacity, good cycle performance, low cost and low toxicity. It is the development trend of ternary cathode materials in the future. Higher, and nickel is the main redox reaction element, so increasing the nickel content can effectively improve the specific capacity of the material, but because the material will show more performance of lithium nickelate, the mat...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 侯雪原宋顺林张学全刘亚飞陈彦彬李建忠
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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