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Coated modified positive electrode material and preparation method thereof

A positive electrode material and coating technology, applied in the field of coating modified positive electrode material and its preparation, can solve the problems of deterioration of electrochemical performance, decreased stability, destruction of crystal structure of materials, etc., and achieves easy industrialization, simple process, Good alkali-reducing effect

Active Publication Date: 2021-12-24
HUNAN CHANGYUAN LICO CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the washing process, water will react with the surface of the high-nickel cathode material, causing the crystal structure of the material to be destroyed
Especially with the increase of Ni content, the stability of the material decreases, and the reaction between the material and water becomes more intense, which leads to more serious structural damage of ultra-high nickel materials after water washing, and more obvious degradation of electrochemical performance.

Method used

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  • Coated modified positive electrode material and preparation method thereof
  • Coated modified positive electrode material and preparation method thereof
  • Coated modified positive electrode material and preparation method thereof

Examples

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preparation example Construction

[0021] The present invention also provides a method for preparing the above-mentioned coated and modified positive electrode material, comprising the following steps:

[0022] Mix the high-nickel base material with zinc borate and other compounds of coated elements in solid state, and mix them uniformly to obtain mixture A;

[0023] The mixture A is sintered in an atmosphere furnace to obtain a coated and modified high-nickel positive electrode material.

[0024] Wherein, the addition amount of the zinc borate is calculated according to the coating amount of B, and the coating amount of B is 0.05-0.5wt% of the high-nickel base material, preferably 0.1-0.3wt%. Other coating elements are at least one of Al, Co, W, Y, Ti, and the corresponding compounds are oxides, oxyhydroxides or hydroxides of coating elements.

[0025] Further, the amount of other coating elements is 0.01-1.0wt% of the high-nickel base material, preferably 0.1-0.5wt%.

[0026] Further, the sintering atmosphe...

Embodiment 1

[0032] Take 500g of LiNi 0.90 co 0.05 mn 0.045 Zr 0.005 o 2 Matrix matrix, add 7.16g of 2ZnO·3B 2 o 3 , which is equivalent to adding 0.25% of B, then adding 5.42g of Al(OH) 3 , equivalent to the addition of Al element is 0.15%.

[0033] Mix well in a blender to obtain a mixture.

[0034] The mixture was placed in an atmosphere furnace, sintered in an oxygen atmosphere, and heated to 300°C for 18 hours; after cooling, it was sieved to obtain LiNi coated with B, Zn and Al 0.90 co 0.05 mn 0.045 Zr 0.005 o 2 Ternary material.

[0035] figure 1 The SEM image of the positive electrode material prepared in Example 1, it can be seen from the figure that the surface of the positive electrode material has a uniform coating layer.

Embodiment 2

[0041] Take 500g of LiNi 0.96 co 0.02 mn 0.01 Mg 0.005 Ti 0.005 o 2 matrix, adding 5.73g of 2ZnO·3B 2 o 3 , which is equivalent to adding 0.2% of B, then adding 2.52g of WO 3 , which is equivalent to adding 0.4% of the W element.

[0042] Mix well in a blender to obtain a mixture.

[0043]The mixture was sintered in an oxygen atmosphere, heated to 400°C for 15 hours at a constant temperature; after cooling, it was sieved to obtain LiNi coated with B, Zn and W 0.96 co 0.02 mn 0.01 Mg 0.005 Ti 0.005 o 2 Ternary material.

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a coated modified positive electrode material and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing a high-nickel matrix material with zinc borate and other compound solid phases of coating elements to obtain a mixture A; and sintering the mixture A in an atmosphere furnace to obtain the coated and modified high-nickel positive electrode material. The zinc borate can be well fused with a high-nickel base material, meanwhile, zinc borate is decomposed into boron oxide and zinc oxide in the sintering reaction process, the boron oxide and the zinc oxide can be well combined with surface residual alkali, soluble lithium of the high-nickel material is reduced, meanwhile, uniform coating of B and Zn is formed on the surface of the material, and the material structure is stabilized. Compared with the prior art, the preparation method provided by the invention is simple in process and easy to industrialize, the positive electrode material can achieve a good alkali reduction effect without water washing, and the electrochemical performance of the positive electrode material is ensured while the synthesis process is simplified.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a coated and modified positive electrode material and a preparation method thereof. Background technique [0002] The modification of high-nickel cathode materials is mainly achieved by means of coating and doping. At present, the coating of high-nickel cathode materials is mainly to improve the electrochemical performance of the material, but it has a limited effect on reducing the alkalinity of the material. At present, the alkalinity of high-nickel materials is mainly reduced by washing with water. During the washing process, the water will react with the surface of the high-nickel cathode material, causing the crystal structure of the material to be destroyed. Especially with the increase of Ni content, the stability of the material decreases, and the reaction between the material and water becomes more intense, which leads to more serious ...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01B35/12H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/50C01B35/127H01M4/366H01M4/505H01M4/525H01M4/628H01M4/624H01M10/0525H01M2004/021H01M2004/028C01P2004/03C01P2004/61C01P2004/80C01P2006/12Y02E60/10
Inventor 陈威杨成胡康白立雄周友元朱健黄承焕
Owner HUNAN CHANGYUAN LICO CO LTD
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