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Composite graphite coated product, graphite composite material and preparation method and application of composite graphite coated product and graphite composite material

A composite graphite and coating technology, which is applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor toughness of the carbon coating layer and many side reactions in the battery cycle, so as to improve high-temperature gas production and inhibit Lithium ion consumption and production cost reduction effect

Pending Publication Date: 2022-02-15
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of poor toughness of the carbon coating layer and many side reactions of the battery cycle in the prior art, and provide a composite graphite coating product, graphite composite material and its preparation method and application

Method used

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  • Composite graphite coated product, graphite composite material and preparation method and application of composite graphite coated product and graphite composite material
  • Composite graphite coated product, graphite composite material and preparation method and application of composite graphite coated product and graphite composite material
  • Composite graphite coated product, graphite composite material and preparation method and application of composite graphite coated product and graphite composite material

Examples

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Effect test

Embodiment 1

[0094] (1) Use a roller mill to pulverize Daqing petroleum raw coke until D50 = 9.1 μm, and the vibration is 0.54 g / cm 3 , pre-carbonized at 1050°C for 108h in a tunnel kiln, and then carried out high-temperature graphitization at 3000°C in a box furnace.

[0095] (2) Mix 80 kg of the single-particle artificial graphite A obtained above with 8.8 kg of anthracene oil in a fusion machine for 10 minutes, heat-treat in a horizontal kettle at 610° C. for 12 hours, and obtain the single-particle artificial graphite B.

[0096] (3) Mix 15kg of single-particle artificial graphite B and 1.65kg of anthracene oil in a fusion machine for 10 minutes, and carbonize in a roller kiln at 1400°C for 12 hours to obtain a composite graphite-coated product.

[0097] (4) Take by weighing 1.5kg composite graphite coating product and 300g concentration be the sodium maleate solution (pH=7) of 0.67M and mix evenly, then pour in the fusion machine, adjust the host rotating speed to be 1200r / min, and th...

Embodiment 2

[0100] The difference between this example and Example 1 is that the concentration of sodium maleate in step (2) is 0.33M.

Embodiment 3

[0102] The difference between this example and Example 1 is that the salt solution in step (2) is sodium acrylate, and the solution concentration is 0.67M.

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Abstract

The invention discloses a composite graphite coated product, a graphite composite material and a preparation method and application of the composite graphite coated product and the graphite composite material. The preparation method of the composite graphite coated product comprises the following steps: (1) carrying out heat treatment on a mixed solution of single-particle artificial graphite A and a coating agent A to obtain single-particle artificial graphite B; wherein the coating agent A is asphalt and / or anthracene oil; and the asphalt comprises coal asphalt and / or petroleum asphalt; and (2) carbonizing a mixed solution of single-particle artificial graphite B and a coating agent B to prepare a composite graphite coated product; wherein the coating agent B is one or more of asphalt, anthracene oil and resin; the asphalt comprises coal asphalt and / or petroleum asphalt; the carbonization temperature ranges from 1200 DEG C to 1700 DEG C. The graphite composite material containing the composite graphite coated product has the characteristic of compact surface coating layer structure, and shows better first discharge efficiency, capacity retention ratio and rate capability when being applied to the lithium ion battery as a negative electrode material.

Description

technical field [0001] The invention relates to a composite graphite-coated product, a graphite composite material and a preparation method and application thereof. Background technique [0002] At present, the existing technology mostly uses carbon coating methods to improve the conductivity of electrodes, such as coating a layer of precursor on the surface of graphite by solid phase coating and liquid phase coating, and then carbonizing at high temperature. The structure of the cladding layer obtained by this method is relatively complete, which not only improves the conductivity of the material but also protects the structure of the graphite itself. At the same time, the method is simple to operate and the cost of raw materials is low, enabling large-scale production. However, the toughness of this coating layer is poor, and the impact is as follows: if the coating layer is too thin and easy to break, the broken coating material may cause more side reactions; if the coati...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCH01M4/366H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 杜娇娇苗荣荣刘梦阳吴志红丁晓阳储小敏
Owner SHANGHAI SHANSHAN TECH CO LTD
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