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Positive electrode composite material, coating device, preparation method and application

A technology of positive electrode materials and composite materials, which is applied in the fields of positive electrode composite materials, coating devices, and preparation. It can solve problems such as complex preparation processes, affecting battery performance, and large internal resistance of materials, so as to increase reaction activity and improve structural stability. , the effect of increasing capacity

Active Publication Date: 2021-07-09
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coating with spray-drying method will cause graphene to coat many positive electrode material particles to form secondary particles of graphene-coated positive electrode material. The contact between the surface of the secondary particle and the graphene sheet can improve the conductivity of the primary particle on the surface, but the second The primary particles inside the secondary particles are not in contact with the conductive agent, resulting in a large internal resistance of the material, which affects the performance of the battery
[0008] Existing positive electrode materials all have problems such as complex preparation process, high cost and poor stability. Therefore, how to ensure the positive electrode material has low cost and simple preparation process, but also make the positive electrode material have strong structural stability and improve battery performance. Cyclic performance has become an urgent problem to be solved

Method used

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  • Positive electrode composite material, coating device, preparation method and application
  • Positive electrode composite material, coating device, preparation method and application
  • Positive electrode composite material, coating device, preparation method and application

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preparation example Construction

[0068] In a specific embodiment, the present invention provides a coating device, such as image 3 As shown, the cladding device includes a housing 4, and the top of the housing 4 is opposite and inclined to have a first feed port 5 and a second feed port 6, and the first feed port 5 and the second feed port 6 Feed inlets 6 are externally connected with feed pipes 8, and the feed pipes 8 are externally connected with intake branch pipes 7; the inner top of the housing 4 is also provided with a cyclone 9; the coating device is used for positive electrode compounding 3 coating steps of graphene in the preparation method of the material.

[0069] Exemplarily, a method for coating graphene 3 and positive electrode material 2 by the above-mentioned coating device is provided, and the method specifically includes:

[0070] The positive electrode material 2 and the solid powder of graphene 3 are blown into the housing 4 through the first feed port 5 and the second feed port 6 respec...

Embodiment 1

[0072] This embodiment provides a method for preparing a positive electrode composite material. The preparation method specifically includes the following steps:

[0073] (I) Weigh the positive electrode material 2 and the precursor of the catalytic material with a mass ratio of 100:1.5. The average particle size of the precursor of the catalytic material is 0.6 μm. After mechanical stirring for 20 minutes, it is calcined at 600 ° C for 5 hours to prepare the catalytic material. Coated cathode material 2;

[0074](II) Heat the cathode material 2 coated with the catalytic material in step (I) for 2 hours under a carbon source gas atmosphere at a heating temperature of 700°C. The carbon source gas atmosphere includes a carbon source gas with a volume ratio of 1:10 and protective Gas, carbon source gas generates carbon nanotubes 1 on the positive electrode material 2, and at 190 ° C, after cyclone stirring and coating with graphene 3 with a horizontal sheet diameter and a vertica...

Embodiment 2

[0077] This embodiment provides a method for preparing a positive electrode composite material. The preparation method specifically includes the following steps:

[0078] (I) Weigh the positive electrode material 2 and the precursor of the catalytic material with a mass ratio of 100:1. The average particle size of the precursor of the catalytic material is 0.2 μm. After mechanical stirring for 15 minutes, it is calcined at 550 ° C for 6 hours to prepare the catalytic material. Coated cathode material 2;

[0079] (II) Heat the positive electrode material 2 coated with the catalytic material in step (I) for 1.5 h under a carbon source gas atmosphere at a heating temperature of 750° C. The carbon source gas atmosphere includes a carbon source gas with a volume ratio of 1:12 and Protective gas, carbon source gas generates carbon nanotubes 1 on the positive electrode material 2, and at 180 ° C, after cyclone stirring and coating with graphene 3 with a horizontal sheet diameter and ...

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Abstract

The invention provides a positive electrode composite material, a coating device, a preparation method and application. The preparation method comprises the following steps of heating a positive electrode material coated with a catalytic material in a carbon source gas atmosphere, generating a carbon nanotube on the positive electrode material by the carbon source gas, and then adding graphene for coating to prepare the positive electrode composite material. The carbon nanotubes are generated on the surface of the positive electrode material in situ and are coated by the graphene, so that the positive electrode composite material has high conductivity and high rate performance, and the material has the characteristics of simple preparation process, low cost, easiness in industrial production and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries and relates to a positive electrode composite material, in particular to a positive electrode composite material, a coating device, a preparation method and an application. Background technique [0002] In recent years, auto companies have increasingly higher requirements for battery companies, and there is an urgent need for high specific energy, long life and low cost cathode materials and their batteries. Lithium-ion batteries are selected by battery companies for their advantages such as high working voltage, large specific energy, long cycle life and low pollution. [0003] However, there are still problems such as cycle, specific energy, voltage and safety in cathode materials. For example, lithium-rich manganese-based materials, nickel-cobalt-aluminum and nickel-cobalt-manganese series also have defects such as poor cycle stability, especially under high temperature condition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B33/00C01G53/00C01B32/194C01B32/162C01B25/45H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCC30B33/00C01G53/44C01B32/162C01B32/194C01B25/45H01M4/366H01M4/505H01M4/525H01M4/5825H01M4/625H01M10/0525H01M2004/021H01M2004/028C01P2004/80C01P2006/40Y02E60/10
Inventor 王亚州张树涛王壮马加力白艳
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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