A positive electrode composite material, coating device, preparation method and application

A technology of positive electrode material and composite material, which is applied in the fields of coating device, positive electrode composite material and preparation, can solve the problems of complex preparation process, influence on battery performance, large internal resistance of materials, etc., so as to increase the reaction activity and improve the structural stability. , the effect of increasing the capacity

Active Publication Date: 2022-05-20
SVOLT ENERGY TECHNOLOGY CO LTD
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  • 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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  • A positive electrode composite material, coating device, preparation method and application
  • A positive electrode composite material, coating device, preparation method and application
  • A 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 coating device includes a casing 4, and the top of the casing 4 is provided with a first feeding port 5 and a second feeding port 6 opposite and inclined at the top. The first feeding port 5 and the second feeding port 6 The feeding ports 6 are all externally connected with a feeding pipe 8, and the feeding pipe 8 is externally connected with an air intake branch pipe 7; the inner top of the casing 4 is also provided with a cyclone 9; the coating device is used for positive electrode compounding The graphene 3 coating step in the preparation method of the material.

[0069] Exemplarily, a method for coating the graphene 3 and the 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 graphene 3 solid powder are blown into the housing 4 with nitrogen th...

Embodiment 1

[0072] This embodiment provides a preparation method of a positive electrode composite material, and the preparation method specifically includes the following steps:

[0073] (I) Weigh the precursor of the positive electrode material 2 and 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, calcined at 600 °C for 5 hours to prepare the catalytic material. Coated positive electrode material 2;

[0074](II) The cathode material 2 coated with the catalytic material in step (I) is heated for 2 hours in a carbon source gas atmosphere, the heating temperature is 700°C, and the carbon source gas atmosphere includes a carbon source gas and protective The carbon nanotubes 1 are formed on the positive electrode material 2, and the carbon nanotubes 1 are formed on the positive electrode material 2. At 190 ° C, after cyclone stirring and coating with graphene 3 with ...

Embodiment 2

[0077] This embodiment provides a preparation method of a positive electrode composite material, and the preparation method specifically includes the following steps:

[0078] (I) Weigh the precursor of the positive electrode material 2 and 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, calcined at 550 ° C for 6 hours to prepare the catalytic material Coated positive electrode material 2;

[0079] (II) The cathode material 2 coated with the catalytic material in step (I) is heated for 1.5 hours in a carbon source gas atmosphere, and the heating temperature is 750° C. The carbon source gas atmosphere includes carbon source gas and a volume ratio of 1:12. 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 transverse sheet diameter an...

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Abstract

The invention provides a positive electrode composite material, a coating device, a preparation method and an application thereof. The preparation method comprises: heating the positive electrode material coated with the catalytic material under a carbon source gas atmosphere, and the carbon source gas is heated in the positive electrode material Carbon nanotubes are formed on the carbon nanotubes, and then coated with graphene to prepare the positive electrode composite material. By in-situ generating carbon nanotubes on the surface of the positive electrode material and covering them with graphene, the positive electrode composite material has high conductivity and high rate performance. The invention has the characteristics of simple preparation process, low cost and easy industrial production.

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, car companies have increasingly demanded battery companies, and there is an urgent need for cathode materials and batteries with high specific energy, long life and low cost. Lithium-ion batteries are selected by battery companies for their advantages of high operating voltage, large specific energy, long cycle life and low pollution. [0003] However, the current cathode materials still have problems such as cycle, specific energy, voltage and safety. For example, lithium-rich manganese-based materials, nickel-cobalt-aluminum and nickel-cobalt-manganese series also have cycle stability, especially under high temperature conditions, there are defects such as poor cy...

Claims

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Application Information

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Patent Type & Authority Patents(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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