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Coating agent, modified graphite material, preparation method and application of modified graphite material, and lithium ion battery

A lithium-ion battery and graphite material technology, applied in the field of coating agents, can solve the problems of uneven coating, poor rate performance and high impedance, and achieve the effects of uniform coating, reduced impedance and good rate performance.

Pending Publication Date: 2021-04-16
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of uneven coating, poor rate performance and high impedance of the coated graphite negative electrode material in the prior art, and provide a coating agent, a modified graphite material and a preparation method thereof, Applications, Li-ion Batteries

Method used

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  • Coating agent, modified graphite material, preparation method and application of modified graphite material, and lithium ion battery
  • Coating agent, modified graphite material, preparation method and application of modified graphite material, and lithium ion battery
  • Coating agent, modified graphite material, preparation method and application of modified graphite material, and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0049](1) Preparation of artificial graphite: set the particle size as D50 to be 9.5um. The petroleum coke is heat-treated in a horizontal coating kettle at a heating temperature of 630°C for 8 hours, and the protective gas used is high-purity nitrogen to obtain a heat-treated graphite intermediate product; Graphitization treatment is carried out at a temperature of 3000°C for 35 hours in a graphitization furnace, and artificial graphite can be obtained after natural cooling.

[0050] (2) Preparation of coating agent: put coumarone resin and industrial washing oil with a mass ratio of 2:1 in a 5000mL three-neck flask, heat to 110°C, and stir at a speed of 80r / min at the same time, stirring The time is 1 hour to ensure that the two components are evenly dispersed. After cooling in the air, pour it out, and the formed mixed solution is the coating agent.

[0051] (3) Preparation of coated graphite material: the artificial graphite prepared in step (1) and the coating agent in s...

Embodiment 2

[0054] The difference from Example 1 is that the mass ratio of coumarone resin: washing oil is 3:1, and the remaining steps are all the same as in Example 1.

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Abstract

The invention discloses a coating agent, a modified graphite material, a preparation method and application of the modified graphite material, and a lithium ion battery. The coating agent comprises coumarone resin and wash oil, wherein a mass ratio of the coumarone resin to the wash oil is (1-3): 1. The coating agent and graphite are mixed according to a ratio of (7-15): 100 and carbonized to prepare the modified graphite material. The modified graphite material is uniform in coating and high in tap density. When the modified graphite material is used for preparing the lithium ion battery, the initial discharge efficiency of the prepared lithium ion battery is higher than or equal to 93.5%, the impedance of the lithium ion battery is significantly reduced, and the rate capability of the lithium ion battery is good.

Description

technical field [0001] The invention relates to a coating agent, a modified graphite material, a preparation method thereof, an application thereof, and a lithium ion battery. Background technique [0002] With the depletion of energy and the deterioration of the environment, it is more and more important to seek alternative clean energy. As a new generation of energy storage materials, lithium-ion batteries have the advantages of light weight, long life, high specific energy density, no pollution, no memory effect, etc., and are widely used in electronic devices such as mobile phones, computers, and digital cameras. [0003] Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, separators, and electrolytes. The performance of negative electrode materials determines battery performance. As the most widely used negative electrode material, graphite has the advantages of abundant reserves, low price, stable electrochemical pe...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525C01B32/20
CPCY02E60/10
Inventor 吴政操吴仙斌苗荣荣吴志红
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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