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Polydopamine and graphene composite coating

A polydopamine and composite coating technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems that heat cannot be dissipated quickly and reduce battery temperature.

Active Publication Date: 2020-10-27
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a composite coating containing polydopamine and graphene. Aiming at the problem that a large amount of heat generated inside the battery cannot be dissipated quickly under the condition of high current charge and discharge, the good thermal conductivity of polydopamine and graphene is utilized. characteristics, coating the composite coating of graphene and polydopamine on the surface of the current collector, further improving the bonding strength between the current collector and the active material, and at the same time, reducing the internal temperature of the battery

Method used

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Experimental program
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Effect test

Embodiment 1

[0014] 50g dopamine monomer is dissolved in HCl solvent, is mixed with the alkaline solution that dopamine concentration is 1mmol / L, and solution pH value is 7.5; 50g graphene is uniformly dispersed in the mixed solvent of NMP and CMC, wherein the NMP and CMC The volume ratio is 100:1, and the volume percentage of graphene in the solvent is 0.1%; the above two solutions are mixed 1:1, and the current collector copper foil and aluminum foil of the lithium-ion battery are respectively placed in the mixed solution, static Leave it for 48 hours. After cleaning, dry at 120° C. for 1 hour to obtain a composite coating of polydopamine and graphene.

Embodiment 2

[0016] 50g dopamine monomer is dissolved in HCl solvent, is formulated into the alkaline solution that dopamine concentration is 100mmol / L, and solution pH value is 11; 70g graphene is uniformly dispersed in the mixed solvent containing NMP, PVDF and DMF, wherein NMP , the volume ratio of DMF and PVDF is 70: 30: 2, and the volume percentage that graphene accounts for in the solvent is 5%; Above-mentioned two kinds of solutions are mixed 1: 2, and the current collector copper foil and aluminum foil of lithium-ion battery are respectively Place in the mixed solution and let it stand still for 24h. After cleaning, vacuum-dry at 80° C. for 1 hour to obtain a composite coating of polydopamine and graphene. Visible to the naked eye, a layer of black composite coating is uniformly deposited on the copper foil and aluminum foil, and the thickness of the coating is 0.5 um. The prepared coated current collector is used as the positive electrode, the lithium sheet is used as the negativ...

Embodiment 3

[0018] Dissolve 50 g of dopamine monomer in HCl solvent to prepare an alkaline solution with a dopamine concentration of 70 mmol / L and a pH of 10, and then add 1% by mass of CMC to the above solvent to form a homogeneous solution. 1.5% graphene by volume was dispersed into the above solution under the action of ultrasonic waves. The nickel current collector of the zinc-air battery was immersed in the mixed solution and allowed to stand for 24 hours. Clean the foamed nickel current collector and dry it in vacuum at 100°C for 2 hours. It is visible to the naked eye that a layer of light black coating is deposited on the current collector with uniform texture.

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Abstract

The invention relates to a polydopamine and graphene composite coating layer. The polydopamine and graphene composite coating layer is characterized by being prepared according to the following stepsof (1) dissolving a dopamine monomer in an HC1 solvent to prepare an alkali solution with dopamine concentration being (1-1,000) mmol L<-1>; (2) uniformly dispersing graphene in the solvent, wherein the volume percent content of the graphene in the solvent accounts for (0.001-99.99)%; and (3) mixing the solutions of the step (1) and the step (2), placing a current collector or a pole plate of a battery in the mixed solution, allowing the mixture to stand for 24-48 hours, drying the mixture under a temperature condition of 80-120 DEG C after cleaning to obtain the polydopamine and graphene composite coating layer. Aiming at the problem that a large amount of heat generated in a battery cannot be rapidly dissipated under a large-current charging and discharging condition, the polydopamine and graphene composite coating layer is coated on a surface of the current collector by means of favorable heat conductivity of polydopamine and graphene, the bonding strength of the current collector and an active substance is further improved, and meanwhile, the effect of reducing the temperature in the battery is achieved.

Description

technical field [0001] The invention relates to a composite coating containing polydopamine and graphene, which has the function of improving the heat dissipation of tabs and current collectors, belongs to the technical field of new energy, and is mainly used in new energy storage such as lithium-ion batteries, metal-air batteries, and supercapacitors. cell field. Background technique [0002] Motors, batteries, and electronic controls are the three core components for the development of new energy vehicles. Among them, the battery is the core element restricting the development of new energy vehicles. At present, what people are pursuing is more about the energy density and life of the battery, and the demand for electric vehicles is more about the cruising range and low-temperature use requirements. However, there are still certain safety problems in the battery at present, such as burning and even explosion. Among them, how to ensure the heat dissipation performance of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/60H01M4/583H01M4/62H01M10/613H01M10/625H01M10/653H01M10/654
CPCY02E60/10
Inventor 王丹赵中令陈慧明韩建张克金
Owner CHINA FIRST AUTOMOBILE