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Preparation method of high nickel ternary lithium battery cathode material with concentration gradient

A ternary lithium battery, concentration gradient technology, applied to battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in achieving uniform and effective coating

Inactive Publication Date: 2018-11-06
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that most of the current core-shell structure materials rely on the coating to control their gradient diffusion through the calcination process, and it is difficult to achieve uniform and effective coating, the present invention proposes a preparation of a high-nickel ternary lithium battery cathode material with a concentration gradient method

Method used

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Examples

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Effect test

Embodiment 1

[0025] A method for preparing a high-nickel ternary lithium battery positive electrode material with a concentration gradient, comprising the following steps:

[0026] a. Grind the nickel hydroxide into fine powder, disperse in the aqueous solution to form a suspension with a mass concentration of 15%, then add mixture A, mixture B, and mixture C in sequence, add mixture A until completely separated, and then add mixture B And let it stand for stratification, and finally add the mixture C and let it stand completely to form a multi-layer suspension. The mixture of mass ratio 1:1, mixture B is the mixture of methyl cellulose and polyoxyethylene castor oil mass ratio 2:1, the mixture C is the mixture of polysorbate and polyvinyl alcohol mass ratio 1:2; The addition amount of A, mixture B, and mixture C is 1.5%, 1.0%, and 0.5% of the mass of the suspension, respectively; and adjust the pH to 7;

[0027]b. Slowly add the aqueous solution of cobalt source and manganese source and ...

Embodiment 2

[0030] A method for preparing a high-nickel ternary lithium battery positive electrode material with a concentration gradient, comprising the following steps:

[0031] a. Grind and refine nickel oxide, disperse in an aqueous solution to form a suspension with a mass concentration of 15%, then add mixture A, mixture B, and mixture C in sequence, add mixture A until completely separated, then add mixture B and Stand for layering, and finally add mixture C and let it stand completely to form a multi-layer suspension. A mixture with a ratio of 1:1, mixture B is a mixture of methylcellulose and polyoxyethylene castor oil with a mass ratio of 2:1, mixture C is a mixture of polysorbate and polyvinyl alcohol with a mass ratio of 1:2; mixture A , the addition of mixture B and mixture C are respectively 2.5%, 1.0%, and 0.5% of the mass of the suspension; and adjust the pH to 9;

[0032] b. Slowly add the aqueous solution of cobalt source and manganese source and complexing agent to the...

Embodiment 3

[0035] A method for preparing a high-nickel ternary lithium battery positive electrode material with a concentration gradient, comprising the following steps:

[0036] a. Grind and refine nickel oxide, disperse in an aqueous solution to form a suspension with a mass concentration of 15%, then add mixture A, mixture B, and mixture C in sequence, add mixture A until completely separated, then add mixture B and Stand for layering, and finally add mixture C and let it stand completely to form a multi-layer suspension. A mixture with a ratio of 1:1, mixture B is a mixture of methylcellulose and polyoxyethylene castor oil with a mass ratio of 2:1, mixture C is a mixture of polysorbate and polyvinyl alcohol with a mass ratio of 1:2; mixture A , the addition of mixture B and mixture C are respectively 2.5%, 2.0%, and 0.5% of the mass of the suspension; and adjust the pH to 10;

[0037] b. Slowly add the aqueous solution of cobalt source and manganese source and complexing agent to th...

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Abstract

The invention belongs to the technical field of preparation of lithium batteries, and in particular relates to a preparation method of a high nickel ternary lithium battery cathode material with concentration gradient, comprising: forming a multi-layer suspension, having high concentration of the bottom layer and low concentration of the upper layer, of the nickel source in the aqueous solution, uniformly dispersing the complex in different layers after the cobalt source and the manganese source are added and complexed, forming a concentration gradient layer inside the adsorbent material afterthe strong adsorption material is adsorbed in order from bottom to top, and finally synthesizing the high-nickel ternary lithium battery cathode material with concentration gradient by high-temperature sintering to remove the organic phase. The high-nickel ternary precursor with uniform concentration gradient is obtained by sequentially adsorbing different concentrations of precursor layers in the suspension through the strong adsorbing material, thereby improving the performance of the cathode material.

Description

technical field [0001] The invention belongs to the technical field of lithium battery preparation, and in particular relates to a preparation method of a high-nickel ternary lithium battery cathode material with a concentration gradient. Background technique [0002] Ternary materials (nickel cobalt lithium manganese oxide) increasing the nickel content can greatly increase the specific capacity of the material, so high nickel ternary materials must be an ideal material for large batteries in the future. The current common lithium batteries mainly include ternary lithium, lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, etc., all of which are named according to the type of positive electrode material. [0003] At present, there are four kinds of positive electrode materials that are fully commercialized: lithium cobaltate, lithium iron phosphate, lithium manganate and ternary lithium. Among them, although lithium cobalt oxide has obvious advantages in...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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