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Coated positive electrode material and preparation method and application thereof

A positive electrode material and coating technology, which is applied in the field of coated positive electrode materials and its preparation, can solve the problems of reducing the residual alkali on the surface of high-nickel positive electrode materials for lithium-ion batteries, the positive electrode materials are susceptible to moisture and water absorption, and the operation process is complicated.

Active Publication Date: 2020-11-10
SVOLT ENERGY TECHNOLOGY CO LTD
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Problems solved by technology

[0002] During the synthesis process of the positive electrode material, in order to make up for the lack of lithium in the positive electrode material due to the volatilization of the lithium source during the calcination process, the proportion of lithium will be appropriately increased during the mixing process of the positive electrode material precursor and the lithium source, but the positive electrode material is in the process of preparation. , its body and excess lithium source will contact with water and carbon dioxide in the air to generate lithium hydroxide and lithium carbonate, that is, residual alkali; too high residual alkali will easily lead to an increase in the pH value of the positive electrode material, making the positive electrode material more susceptible to moisture and water absorption , and it is easy to cause PVDF to agglomerate, resulting in an increase in the viscosity of the battery slurry and gelatinous appearance, which cannot enter the next process. Therefore, reducing the residual alkali has a very important impact on the positive electrode material
[0003] CN111370684A discloses a method for reducing the residual alkali content on the surface of a high-nickel positive electrode material of a lithium-ion battery, the method comprising: adding a certain amount of non-aqueous, inactive hydrogen organic Add a certain amount of acid or acid derivatives into the solvent, stir until completely dissolved, and obtain a cleaning solution for reducing the residual alkali on the surface of the high-nickel positive electrode material of the lithium ion battery; wherein, the high-nickel positive electrode material to be treated is inactive with non-aqueous The mass ratio of the hydrogen-organic solvent is 1:0.5 to 1:4; the molar concentration of the acid or acid derivative in the washing liquid is 0.5 to 1.5 times the molar amount of the residual alkali on the surface of the high-nickel positive electrode material to be treated ; Stir at a linear speed of 1m / s ~ 10m / s, add the high-nickel cathode material to be treated into the washing liquid, and stir for 1 ~ 120min; after removing the solvent by centrifugation, heat and dry under vacuum at 20°C ~ 80°C After obtaining the high-nickel positive electrode material after treatment; CN108878863A discloses a method for improving the surface residual alkalinity of the ternary positive electrode material of lithium ion battery, comprising the following steps: the powder nickel-cobalt-manganese layered positive electrode material with the molecular formula being LiNiCoMnO and Mix with water, centrifuge to obtain washed powder material; add lithium source to absolute ethanol and mix evenly, then add water washed powder material, mix evenly, evaporate completely, dry, and sinter to obtain lithium-ion battery ternary positive electrode material; The above-mentioned schemes all use the method of washing to reduce the residual alkali on the surface of the positive electrode material, the operation process is complicated, and it is easy to cause adverse effects on the electrical properties of the positive electrode material

Method used

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

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preparation example Construction

[0059] The preparation process flow chart of coated positive electrode material in the present invention is as follows figure 1 shown by figure 1 It can be seen that the preparation process includes:

[0060] Preparation of complexation solution: the complexation solution contains EDTA, NH 3 and water; among them, NH 3 Take NH 3 ·H 2 Form O added, and

[0061] Add coated metal source in complex solution, coated metal source comprises cobalt source (such as Co(NO 3 ) 2 ·6H 2 O), sources of manganese (such as Mn(NO 3 ) 2 ·6H 2 O) and aluminum sources (such as Al(NO 3 ) 3 9H 2 O); Stirring and heating for a certain hour; Obtain a dark red gel with high viscosity (comprising Mn(Al in the gel) m co n ) 2 o 8 )and

[0062] Add the positive electrode material (for example, the primary sintered positive electrode material obtained by mixing the precursor and the lithium source through primary sintering) to the above dark red gel, stir evenly, dry it in vacuum, and ca...

Embodiment 1

[0064] The preparation method of coated positive electrode material:

[0065] (1) The precursor Ni 0.88 co 0.06 mn 0.03 al 0.03 (OH) 2 Dry-mix with lithium hydroxide at a molar ratio of 1:1.03, perform primary sintering for 10 hours at 800°C in an oxygen atmosphere, cool, pulverize and sieve to obtain a primary sintered polycrystalline positive electrode material Li 1.03 Ni 0.88 co 0.06 mn 0.03 al 0.03 o 2 ;

[0066] (2) According to the molar ratio EDTA:NH 3 :H 2 O (deionized water)=0.06:1:5.5, the complexation solution of 100mL is prepared by mixing the three;

[0067] (3) 0.005mol Mn(NO 3 ) 2 ·6H 2 O, 0.01molAl(NO 3 ) 3 9H 2 O and 0.02mol Co(NO 3 ) 2 ·6H 2 O was added to the above complex solution, stirred to form a red solution, and then stirred and heated at 80°C for 5 hours to form a high-viscosity dark red gel Mn(AlCo 2 ) 2 o 8 ;

[0068] (4) Add 100 g of the polycrystalline positive electrode material obtained in step (1) to the above gel solut...

Embodiment 2

[0070] The difference between this embodiment and embodiment 1 is that the addition of manganese source, aluminum source and cobalt source is replaced by 0.003molMn (NO 3 ) 2 ·6H 2 O, 0.015molAl(NO 3 ) 3 9H 2 O and 0.015mol Co(NO 3 ) 2 ·6H 2 O; Other parameters and conditions are exactly the same as in Example 1.

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Abstract

The invention relates to a coated positive electrode material and a preparation method and application thereof. The preparation method comprises the steps: adding a coated metal source into a complexing solution, performing mixing and heating to obtain gel, adding a positive electrode material into the gel, and performing mixing and calcining to obtain the coated positive electrode material, wherein the coated metal source comprises a cobalt source, a manganese source and an aluminum source. According to the preparation method, the sol-gel method is adopted, residual alkali on the surface of the positive electrode material can be effectively reduced, a coating layer of the obtained coated positive electrode material has electronic conductivity, the contact area of the positive electrode material and electrolyte can be effectively reduced, side reactions are reduced, and the electrochemical performance of the positive electrode material is improved.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to a coated positive electrode material and a preparation method and application thereof. Background technique [0002] During the synthesis process of the positive electrode material, in order to make up for the lack of lithium in the positive electrode material due to the volatilization of the lithium source during the calcination process, the proportion of lithium will be appropriately increased during the mixing process of the positive electrode material precursor and the lithium source, but the positive electrode material is in the process of preparation. , its body and excess lithium source will contact with water and carbon dioxide in the air to generate lithium hydroxide and lithium carbonate, that is, residual alkali; too high residual alkali will easily lead to an increase in the pH value of the positive electrode material, making the positive electrode material more suscepti...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/626H01M10/0525Y02E60/10
Inventor 白艳张树涛潘海龙王壮苏强
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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