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Method for preparing spherical lithium battery cathode material LiNixCoyAl1xyO2 based on normal distribution of aluminum concentration

A nickel-cobalt lithium aluminate, normal distribution technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve problems such as self-forming spheres, improve capacity and cycle performance, and solve structural inhomogeneity Effect

Active Publication Date: 2016-03-09
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In response to this problem, many patents have proposed a nickel-cobalt-aluminum core-shell structure model, which is expected to achieve the coating of aluminum elements on the nickel-cobalt precipitation shell. However, due to the rapid precipitation of aluminum elements, it is easy to form a sphere by itself, which is difficult to achieve. Uniform coating on the nuclear surface

Method used

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  • Method for preparing spherical lithium battery cathode material LiNixCoyAl1xyO2 based on normal distribution of aluminum concentration
  • Method for preparing spherical lithium battery cathode material LiNixCoyAl1xyO2 based on normal distribution of aluminum concentration
  • Method for preparing spherical lithium battery cathode material LiNixCoyAl1xyO2 based on normal distribution of aluminum concentration

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Embodiment 1

[0019] (1) Accurately weigh the soluble aluminum salt and soluble strong base with a one-ten-thousandth balance, and prepare an aqueous solution of equal concentration 2mol / L according to the molar ratio of 1:4. Use the 2mol / L soluble aluminum salt solution as the base solution, control the flow rate of the strong base to 5g / min through a flowmeter, and stir under the condition of 300r / min until aluminum hydroxide colloid appears, at this time, the consumption of strong base is 4% of the total amount. 3 / 3; under stirring at a low speed of 200r / min, continue to drop the remaining strong base into the aluminum hydroxide colloid until the colloid is completely turned into a clear solution, and 20 liters of 4mol / L tetrahydroxyaluminate ionic liquid is obtained;

[0020] (2) Preparation of spherical nickel-cobalt-aluminum precursors: Prepare soluble nickel and cobalt salts in a molar ratio of 80:15 to prepare an aqueous solution of a certain concentration, and add a predetermined ra...

Embodiment 2

[0029] (1) Accurately weigh the soluble aluminum salt and soluble strong base with a one-ten-thousandth balance, and prepare an aqueous solution of equal concentration 2mol / L according to the molar ratio of 1:4. Use 2mol / L soluble aluminum salt solution as the bottom solution, control the flow rate of the strong base to 5g / min through a flow meter, and stir under the condition of 300r / min until aluminum hydroxide colloid appears. Three-quarters; under 200r / min low-speed stirring, continue to drop the remaining strong base in the aluminum hydroxide colloid until the colloid is all turned into a clear solution to obtain 20 liters of 3mol / L tetrahydroxyaluminate ion;

[0030] (2) Preparation of spherical nickel-cobalt-aluminum precursors: Prepare soluble nickel and cobalt salts in a molar ratio of 85:10 to make an aqueous solution of a certain concentration, and add a predetermined ratio to dilute (the ratio of nickel-cobalt-aluminum is 85: 10:5) Tetrahydroxyaluminate ionic liqui...

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Abstract

The present invention discloses a method for preparing a spherical lithium battery cathode material LiNixCoyAl1xyO2 based on normal distribution of aluminum concentration. The morphology of the LiNixCoyAl1xyO2 material prepared by the method is close to a sphere structure, and concentration of an aluminum element is normally distributed from a sphere center to a sphere shell. According to the method disclosed by the present invention, colloid is prepared by combining aluminum ions and hydroxy radicals, colloidal particles are dissolved under the action of strong base to form tetrahydroxy meta-aluminic acid radical ionic liquid. Precipitation is completed in a manner that tetrahydroxy meta-aluminic acid radicals are hydrolyzed to generate aluminum hydroxide, coprecipitation of the aluminum hydroxide and nickle and cobalt hydroxide can be implemented due to a low hydrolysis rate, and the hydrolysis rate of the aluminum hydroxide is controlled by PH, and the LiNixCoyAl1xyO2 spherical material of which aliminum concentration is normally distributed is formed. By the means of the dispersing effect of an organic medium 3-methyl-1-butanol, mixing of a lithium source and precursor particles at the molecule level is implemented under the heating condition and capacity per gram and cycling performance of the cathode material are greatly improved.

Description

technical field [0001] The invention relates to a method for preparing nickel-cobalt-aluminate lithium, a positive electrode material of a spherical lithium battery, based on the normal distribution of aluminum concentration. Background technique [0002] In the last century, the successful research and development of lithium batteries by Japan's Sony Corporation led to the development of the lithium battery industry. Lithium batteries have the advantages of light weight, large specific capacity, and no memory effect, making them widely used in various electronic portable devices and electric vehicles. With the development of society, while people's demand for lithium batteries has increased, new requirements have also been put forward: good safety, strong cycle performance, and small mass and volume. As a result, lithium batteries have been updated successively through lithium iron phosphate, lithium cobalt oxide, and lithium nickel oxide. Ternary materials are the hotspot...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/525H01M10/052
CPCH01M4/1391H01M4/525H01M10/052Y02E60/10
Inventor 关成善宗继月孟博闫凯丽杜显振
Owner SHANDONG GOLDENCELL ELECTRONICS TECH