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A kind of coated positive electrode material and preparation method thereof
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A cathode material and modification technology, applied in the field of coating modified cathode 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 and good alkali reduction. Effect, simple process effect
Active Publication Date: 2022-03-04
HUNAN CHANGYUAN LICO CO LTD +2
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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.
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[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%.
[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 lithiumion battery materials, and particularly relates to a coating modified positive electrode material and a preparation method thereof. The high-nickel matrix material is solid-phase mixed with zinc borate and compounds of other coating elements, and after mixing uniformly, mixture A is obtained; the mixture A is sintered in an atmosphere furnace to obtain a coating-modified high-nickel positive electrode material. Zinc borate can be well fused with high-nickel matrix materials, and at the same time, zinc borate is decomposed into boronoxide and zincoxide during the sintering reaction. These two substances can be well combined with surface residual alkali and reduce the solubility of high-nickel materials. At the same time, a uniform coating of B and Zn is formed on the surface of the material to stabilize the material structure. Compared with the prior art, the preparation method provided by the present invention has a simple process and is easy to industrialize, and the positive electrode material can achieve a good alkali reduction effect without washing with water, which simplifies the synthesis process and ensures the electrochemical performance of the positive electrode material. .
Description
technical field [0001] The invention belongs to the technical field of lithiumion 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 ...
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