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Polydopamine modified coating facilitating battery heat dissipation

A polydopamine, modified coating technology, applied in secondary batteries, battery electrodes, battery pack components, etc., can solve the problems of exporting battery heat, changing the heat resistance of materials, etc. The effect of adhesion and temperature will not increase significantly

Inactive Publication Date: 2018-02-23
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these improvement measures either change the heat resistance of the material, or fundamentally stop the charging and discharging process of the battery, but do not fundamentally lead out the heat in the battery.

Method used

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  • Polydopamine modified coating facilitating battery heat dissipation
  • Polydopamine modified coating facilitating battery heat dissipation
  • Polydopamine modified coating facilitating battery heat dissipation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, weigh a certain amount of dopamine hydrochloride (189.7 g / mol, Aladdin) and dissolve it in Tris (chemically pure, Aladdin), hydrochloric acid (chemically pure, Sinopharm Shenyang Reagent Factory), methanol (chemically pure, Aladdin), Pure, Sinopharm Shenyang Reagent Factory) and ultrapure water (conductivity less than 18 MΩ -1 ), prepare a dopamine solution with a concentration of 10 mmol / L in a weakly alkaline solution of pH=8.51 configured in a certain proportion. Then, the Celgard PP membrane (Celgard 2500, 25 μm) was immersed in the modified organic material, and taken out after 24 h at room temperature, and rinsed with deionized water for 2 h. Finally, it was dried for 8 h at 50°C in a vacuum environment. Electrochemical window display of polydopamine modified diaphragm ( figure 1 ), the substance can be used in lithium iron phosphate batteries. From figure 2 , 3 According to the TGA and DSC data before and after the diaphragm modification, polydopamine has...

Embodiment 2

[0021] First, weigh a certain amount of dopamine hydrochloride (189.7 g / mol, Aladdin), and dissolve it in Tris (chemically pure, Aladdin), hydrochloric acid (chemically pure, Sinopharm Shenyang Reagent Factory), ethanol (chemically pure, Aladdin), Pure, Sinopharm Shenyang Reagent Factory) and ultrapure water (conductivity less than 18 MΩ -1 ), prepare a dopamine solution with a concentration of 1000 mmol / L in a weakly alkaline solution with pH=7.5 configured in a certain proportion. After leaving the above solution at room temperature for 24 hours, centrifugation, standing, filtering, washing, and drying the filter cake to obtain polydopamine solid particles. The structure of the polydopamine powder particles is as follows Figure 4 Shown. The relevant test results of the powder after drying are as follows Figure 5 , Image 6 with Figure 7 As shown, the mass fractions of dioxindole, indoledione, dopamine monomer, and polydopamine in polydopamine particles are 10%: 5%: 20%: 65...

Embodiment 3

[0023] First, weigh a certain amount of dopamine hydrochloride (189.7 g / mol, Aladdin), and dissolve it in tris (chemically pure, Aladdin), hydrochloric acid (chemically pure, Sinopharm Shenyang Reagent Factory), isopropanol (Chemical purity, Sinopharm Shenyang Reagent Factory) and ultrapure water (conductivity less than 18 MΩ -1 ), prepare a dopamine solution with a concentration of 1 mmol / L in an alkaline solution with pH=11 configured in a certain proportion. Then, immerse the aluminum-plastic film as the modified organic material, take it out after 24 h at room temperature, and rinse with deionized water for 2 h. Finally, it was dried for 8 h at 50°C in a vacuum environment. The thermal conductivity of the obtained polydopamine modified aluminum plastic film is increased by 12%, and the mass fractions of dioxindole, indoledione, dopamine monomer, and polydopamine in the polydopamine particles are 5%: 3%: 12%, respectively : 80%.

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Abstract

The invention relates to a polydopamine modified coating facilitating battery heat dissipation. The polydopamine modified coating is characterized by being prepared by dissolving dopamine into an aqueous solution with the pH of 7.5 to 11, and polymerizing. The polydopamine coating comprises the following main substances in percentage by weight: 0-10% of dihydroxy indole, 1%-5% of 2-indolinone, 0-20% of dopamine monomer, and 0-99.99% of polydopamine. A coating substrate is inorganic particles, a metal material and an organic material, wherein the coating is generated by self-polymerizing dopamine solution on the substrate, or by comprising the following steps: self-polymerizing dopamine from the dopamine solution in the solution, centrifuging, standing, filtering, cleaning and drying to obtain polydopamine powder particles, then dissolving the powder particles into slurry and coating. The generated powder particles containing dihydroxy indole, 2-indolinone, dopamine monomer and polydopamine are prepared into the coating by utilizing the heat absorption characteristic, thus being applied onto the interior of a diaphragm, a pole piece and a battery case, and by utilizing the heat absorption and heat conduction effects of the polydopamine coating, the heat inside the battery can be effectively dissipated, so that the heat dissipation purpose is achieved.

Description

Technical field [0001] The invention relates to a modified polydopamine coating that is beneficial to battery heat dissipation, which is mainly applied to the coating of battery pole pieces, aluminum plastic film, steel shell, aluminum shell and plastic shell battery and the coating of inorganic particles used in the battery. Layer; belongs to the field of new energy technology. Background technique [0002] Energy-saving and new energy vehicles such as hybrid electric vehicles, pure electric vehicles and fuel cell vehicles have become better development paths. However, safety and reliability, life span, driving range, cost, and public supporting facilities have greatly restricted the rapid development of new energy vehicles. Among them, technological breakthroughs and large-scale applications of power batteries are the most critical. However, in the process of high current overcharge and overdischarge of the battery, as the ions travel through the diaphragm, electrochemical rea...

Claims

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Application Information

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IPC IPC(8): H01M2/02H01M2/14H01M2/16H01M4/36H01M4/62H01M10/613H01M10/625H01M10/653H01M10/654H01M10/6551H01M50/121H01M50/403H01M50/411
CPCH01M4/366H01M4/622H01M10/613H01M10/625H01M10/653H01M10/654H01M10/6551H01M50/10H01M50/124H01M50/403H01M50/411Y02E60/10
Inventor 王丹赵中令于力娜张克金韩建
Owner CHINA FIRST AUTOMOBILE
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