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Coating modification method for reducing metal dissolution of high-voltage ternary positive electrode material

A positive electrode material and high-voltage technology, applied in the direction of electrical components, battery electrodes, non-metallic elements, etc., can solve problems such as increasing battery polarization and internal resistance, affecting battery cycle performance, and increasing electrode/electrolyte interface reactions. Achieve uniform coating, high strength and good effect

Active Publication Date: 2020-12-01
宜宾锂宝新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, the ternary positive electrode material increases the charging cut-off voltage and will cause the increase of the interface reaction of the electrode / electrolyte, increasing the positive electrode The corrosion of materials and the dissolution of transition metal ions increase the polarization and internal resistance of the battery, affecting the cycle performance of the battery, and provide a coating modification method to reduce the dissolution of high-voltage ternary positive electrode materials.

Method used

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  • Coating modification method for reducing metal dissolution of high-voltage ternary positive electrode material
  • Coating modification method for reducing metal dissolution of high-voltage ternary positive electrode material
  • Coating modification method for reducing metal dissolution of high-voltage ternary positive electrode material

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Effect test

Embodiment 1

[0039] Prepare the NCM523 high-voltage positive electrode material with aluminum phosphate as the inner cladding layer and aluminum oxide-lithium fluoride as the outer cladding layer;

[0040] (1) Configure 0.2mol / L phosphoric acid solution, weigh aluminum hydroxide and phosphoric acid solution according to the molar ratio of aluminum element and phosphate root as 1:3, and slowly add aluminum hydroxide to the beaker containing phosphoric acid solution Stir to dissolve completely to obtain aluminum phosphate solution;

[0041] (2) According to the mass ratio of the mass of the aluminum element to the NCM523 positive electrode material is 1:0.02, add the 4.2 μm NCM523 positive electrode material to the aluminum phosphate solution in step (1), and spray dry it after stirring at 300rpm for 2h Processing to obtain a solid mixture of pre-coated aluminum phosphate;

[0042] (3) Physically mixing the solid mixture in step (2) with alumina and lithium fluoride according to a mass rati...

Embodiment 2

[0061] Prepare the NCM811 high-voltage positive electrode material with tungsten phosphate as the coating core layer and tungsten oxide-lithium fluoride as the coating shell layer.

[0062] (1) Prepare 0.1moL / L phosphoric acid solution, weigh tungsten hydroxide and phosphoric acid solution according to the molar ratio of tungsten element to phosphate radical of 1:3, slowly add tungsten hydroxide to the beaker containing phosphoric acid solution Stir until completely dissolved.

[0063] (2) According to the mass ratio of the mass of tungsten element to the NCM811 positive electrode material is 1:0.04, add 4.5 μm NCM811 positive electrode material to the solution in step (1), stir at 200rpm for 1h and then spray dry treatment to obtain a solid mixture of pre-coated tungsten phosphate.

[0064] (3) Sinter the mixed material in step (2) at a temperature of 400°C in an air atmosphere with a ventilation rate of 30L / min for 8h in a box furnace to obtain tungsten phosphate as the coa...

Embodiment 3

[0078] Preparation of zinc oxide-lithium fluoride / zinc phosphate coated NCM622 high-voltage cathode material.

[0079] (1), configure 0.5moL / L phosphoric acid solution, weigh zinc hydroxide and phosphoric acid solution according to the molar ratio of zinc element and phosphate root as 1:3, slowly add zinc hydroxide to the beaker containing phosphoric acid solution Stir until completely dissolved.

[0080] (2) According to the mass ratio of zinc element to NCM622 positive electrode material being 1:0.005, add 11 μm NCM622 positive electrode material to the solution in step (1), stir at 400rpm for 4h, then spray dry , to obtain a solid mixture of pre-coated zinc phosphate.

[0081] (3), the mixed material in step (2) is sintered in a box furnace for 15 hours at a temperature of 800° C. in an air atmosphere with a ventilation rate of 30 L / min to obtain zinc phosphate as a coating core layer, and zinc oxide- Lithium fluoride is the NCM622 high-voltage positive electrode material...

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Abstract

The invention discloses a coating modification method for reducing metal dissolution of a high-voltage ternary positive electrode material. The method comprises the following steps of: (1) adding metal hydroxide into a phosphoric acid solution to prepare a metal phosphate solution, adding a ternary positive electrode material into the metal phosphate solution, stirring, and carrying out spray drying treatment to obtain a core layer solid mixture pre-coated with metal phosphate; and (2) mixing the core layer solid mixture obtained in the step (1) with a metal oxide and fluoride, carrying out ball milling for 1-20 hours, and sintering to obtain the coated modified ternary positive electrode material of which the inner layer is coated with metal phosphate and of which the outer layer is coated with metal oxide-fluoride. According to the core-shell structure coating method adopting the composite coating process, the coating form of a core-shell structure with the phosphate as the inner coating layer and the metal oxide-fluoride as the outer coating layer is adopted, uniform coating can be achieved, and the coating layers are high in strength and good in effect.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a coating modification method for reducing metal dissolution of high-voltage ternary positive electrode materials. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, high specific energy, long life, no memory effect, and small self-discharge. They have been widely used in various portable electronic products, and have potential application markets in fields such as hybrid electric vehicles and pure electric vehicles. . The current commercial lithium battery cathode materials mainly include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary cathode materials. The ternary cathode material has the advantages of high energy density and good cycle performance, and gradually replaces the application of lithium iron phosphate in the power and digital fields. With the increase of the country's requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525C01B25/36C01F7/02C01F7/50
CPCH01M4/505H01M4/525H01M4/62H01M10/0525C01B25/36C01F7/02C01F7/50C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 陈德贤张彬张郑颜华
Owner 宜宾锂宝新材料有限公司
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