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Lithium battery anode material and preparation method and application thereof

A technology for positive electrode materials and lithium batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance of high-nickel positive electrode materials, inability to form a uniform coating layer, complicated process, etc., to achieve a suitable large-scale Good for production, good for wrapping, and strong operability

Inactive Publication Date: 2019-06-07
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-nickel cathode materials have poor cycle performance and high residual alkali on the surface. The traditional improvement method is to coat and wash the surface of the high-temperature synthesized material, and then bake it twice. Among them, the surface coating of the cathode material can improve the cycle life of the material. Washing can reduce the residual alkali on the surface of the material
However, the traditional coating method cannot form a uniform coating layer, and washing and coating need to be carried out in two steps, and it is carried out after the material is synthesized at high temperature. Not only the process is complicated, the cost is high, but also some positive electrode materials will be lost , the yield is lower

Method used

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  • Lithium battery anode material and preparation method and application thereof
  • Lithium battery anode material and preparation method and application thereof
  • Lithium battery anode material and preparation method and application thereof

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preparation example Construction

[0044] According to the method for preparing the positive electrode material of the lithium battery according to the above-mentioned embodiments of the present invention, the precursor of the positive electrode material and the lithium salt can be synthesized into an uncoated positive electrode material at a low temperature by using a cosolvent, that is, a low-temperature roasting product; The positive electrode material is mixed and reacted with the phosphate aqueous solution, which not only reduces the residual alkali on the surface of the material, so that the residual alkali content of the finally obtained positive electrode material is not higher than 4000ppm, but also makes the residual lithium on the surface of the material combine with phosphate ions to form a precipitate , and nucleate on the surface of the material, and then through high-temperature calcination, a positive electrode material with a lithium phosphate coating layer on the surface can be finally formed, a...

Embodiment 1

[0050] (1) The positive electrode material precursor (Ni 0.83 Co 0.11 Mn 0.06 )(OH) 2 ), lithium salt LiOH and flux Mg(OH) 2 Mixing and calcining at a low temperature of 200 ° C for 15 h to obtain a low-temperature calcined product, wherein the mass ratio of the cathode material precursor, lithium salt and flux is 100:49:3;

[0051] (2) Combine the low-temperature calcination product with phosphate LiH 2 PO 4 mixed with the aqueous solution of phosphate, stirred for 0.5 h, filtered, and dried at 120 °C to obtain a low-temperature calcined product after washing and coating, wherein the phosphate LiH 2 PO 4 The mass concentration of the aqueous solution is 10wt%;

[0052] (3) The low-temperature calcination product after washing and coating is calcined at a high temperature of 750 ° C for 15 hours to obtain a positive electrode material, wherein the general formula of the active material of the positive electrode material is LiNi 0.83 Co 0.11 Mn 0.0.06 O 2 .

Embodiment 2

[0054] (1) The positive electrode material precursor (Ni 0.83 Co 0.11 Mn 0.06 )(OH) 2 ), lithium salt Li 2 CO 3 and flux SrCO 3 Mixing and calcining at a low temperature of 500 ° C for 5 hours to obtain a low-temperature calcined product, wherein the mass ratio of the cathode material precursor, the lithium salt and the flux is 100:42:5;

[0055] (2) Combine the low-temperature calcination product with phosphate Li 2 HPO 4 Mixed with the aqueous solution of phosphate, stirred for 2 hours, filtered, and dried the filtered product at 115 °C to obtain a low-temperature calcined product after washing and coating, wherein the phosphate Li 2 HPO 4 The mass concentration of the aqueous solution is 0.1%;

[0056] (3) The low-temperature calcination product after washing and coating is calcined at a high temperature of 950 ° C for 5 hours to obtain a positive electrode material, wherein the general formula of the active material of the positive electrode material is LiNi 0.83...

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Abstract

The invention discloses a lithium battery positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing a positive electrode material precursor, lithium salt and a fluxing agent, and carrying out low-temperature roasting treatment to obtain a low-temperature roasted product; (2) mixing the low-temperature roasted product with phosphate aqueous solution, and performing water washing-coating treatment to obtain a low-temperature roasting product after water washing-coating; (3) carrying out high-temperature roastingtreatment of the low-temperature roasted product after water washing-coating to obtain the positive electrode material. The method is strong in operability, high in preparation efficiency and low incost, and the prepared positive electrode material is high in yield, relatively uniform in coating, low in material residual alkali content, good in cycling stability and long in cycling service life.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery positive electrode material and a preparation method and application thereof. Background technique [0002] The rapid development of the new energy vehicle industry has increased the requirements for the cruising range and safety of lithium-ion power batteries. Among the four key main materials of lithium-ion power batteries, the performance of the cathode material determines the performance, safety and cost of the entire battery. Ternary cathode materials have been widely used due to their higher specific capacity and voltage. As the demand for energy density in power batteries increases, it is necessary to increase the nickel content of the cathode material to increase its capacity. However, the high-nickel cathode material has poor cycle performance and high residual alkali on the surface. The traditional improvement method is to coat and wash the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 乔齐齐江卫军许鑫培施泽涛
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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