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

A coating agent, graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unfavorable industrial production, complex production process, and insufficient lithium insertion rate.

Active Publication Date: 2021-05-07
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problems of insufficient lithium intercalation rate, unsatisfactory fast charging performance, complicated production process and unfavorable industrial production of lithium battery graphite negative electrode materials in the prior art, and provides a coating agent, coating Coated modified graphite negative electrode material, preparation method and application thereof, lithium ion battery

Method used

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

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Effect test

Embodiment 1

[0106]1 preparation of coated agent

[0107]The petroleum bitumen having a softening point is 250 ° C as a solute; toluene is used as a solvent; ammonium sulfate is used as a high temperature initiator, and its addition amount is 2 wt.%; DCP is added as a graft initiator, and the amount of 0.3 wt is added. .%; 0.1 wt.% Single-walled carbon nanotube nitromethylpyrrolidone as a conductive auxiliary agent, add amount of 0.1 wt.%; Polyvinylpyrrolidone K30 as a topical control aid, and add amount of negative electrode material. 0.4 wt.%; Acidic acid as a topographical control aid, add amount of 0.2 wt.% Of the negative electrode material. After the above materials were respectively weighed, stir mixed, the temperature was 120 ° C, the stirring time was 4 h, and after stirring was completed, it was used to use high pressure homogeneous machine homogeneous 3 times to obtain a coating agent having a coating value of 20%.

[0108]2 Preparation of coated modified graphite anode material

[0109]S1, wi...

Embodiment 2

[0113]In addition to the addition of 0.1 wt.% Of single-walled carbon nanotrophizine methylpyrrolidone during the preparation of the coating, other methods according to Example 1.

Embodiment 3

[0115]Except for the preparation of the coating agent, coal asphalt calculated according to the residual value: C9 petroleum resin = 3: 1 instead of petroleum asphalt, other methods according to Example 1 were carried out.

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Abstract

The invention discloses a coating agent, a coated modified graphite negative electrode material and a preparation method and application thereof, and a lithium ion battery. The coating agent comprises a solute, a solvent and an auxiliary agent, wherein the solute is one or more of coal pitch, petroleum pitch and petroleum resin; the auxiliary agent comprises a cross-linking agent. The preparation method of the coated modified graphite negative electrode material comprises the steps of S1, mixing graphite aggregate with the coating agent to obtain a mixture A; S2, performing heat treatment on the mixture A to obtain a mixture B; and S3, carrying out carbonization treatment on the mixed material B, thereby obtaining the product. The graphite aggregate structure of the graphite negative electrode material prepared by the invention is well kept; and the graphite negative electrode material has excellent lithium ion rapid intercalation and deintercalation capability and excellent circulation capability. The preparation method is simple and feasible, and has the advantages of large-scale production, low cost, environment friendliness, convenience in use and the like.

Description

Technical field[0001]The present invention relates to a coating agent, an modified graphite anode material and a preparation method thereof, and a lithium ion battery.Background technique[0002]Compared with other secondary batteries, the lithium-ion battery is not only high energy density, high operating voltage, and has a unique advantage that is well safe, environmentally friendly and non-pollution. Therefore, lithium batteries are widely used in a wide variety of microelectronic portable equipment, transportation and aerospace and other equipment. With the development of technology, the electrochemical energy storage device has proposed higher rapid charging requirements.[0003]The negative electrode material as one of the four major materials plays a crucial effect on the rapid charging capability of lithium batteries, so the negative electrode material is one of the main breakthroughs in the rapid charging capacity of lithium ion batteries. At present, the commercially used lith...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M4/583H01M10/0525
CPCH01M4/62H01M4/366H01M4/583H01M10/0525Y02E60/10
Inventor 潘福森聂顺军韩家安李虹王旭峰孙宝利
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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