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Polydopamine and graphene composite coating layer

A technology of polydopamine and composite coating, applied in the direction of electrode carrier/current collector, electrical components, electrochemical generator, etc., can solve the problems of lowering the battery temperature, heat can not be dissipated quickly, and achieve the effect of lowering the surface temperature of the battery

Active Publication Date: 2018-01-05
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 of polydopamine and graphene, which aims 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, and utilizes the good thermal conductivity of polydopamine and graphene characteristics, a composite coating of graphene and polydopamine is coated on the surface of the current collector to further improve the bonding strength between the current collector and the active material, and at the same time, achieve the effect of reducing the internal temperature of the battery

Method used

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Examples

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Effect test

Embodiment 1

[0016] Such as figure 1 Dissolve 50g of dopamine monomer in HCl solvent as shown, and prepare dopamine concentration as 1mmol•••L -1 50g graphene is uniformly dispersed in the mixed solvent of NMP and CMC, wherein the volume ratio of NMP and CMC is 100:1, and the volume percentage that graphene occupies in the solvent is 0.1 %; Mix the above two solutions 1:1, place the current collector copper foil and aluminum foil of the lithium-ion battery in the mixed solution, and place it statically for 48 hours. After cleaning, dry at 120° C. for 1 hour to obtain a composite coating of polydopamine and graphene.

Embodiment 2

[0018] Dissolve 50g of dopamine monomer in HCl solvent to make dopamine concentration of 100mmol•••L -1 70g graphene is uniformly dispersed in the mixed solvent containing NMP, PVDF and DMF, wherein the volume ratio of NMP, DMF and PVDF is 70: 30: 2, and graphene is in the solvent The volume percentage is 5%; the above two solutions are mixed 1:2, and the current collector copper foil and aluminum foil of the lithium-ion battery are respectively placed in the mixed solution and left to stand for 24 hours. 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 negative electrode material, and the PP material is used as the diaphragm to assemble a C2032 butto...

Embodiment 3

[0020] Dissolve 50g of dopamine monomer in HCl solvent to make dopamine concentration of 70mmol•••L -1 Alkaline solution, the pH value of the solution is 10, then add 1% CMC in 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 of 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 units such as lithium-ion batteries, metal-air batteries, and supercapacitors. 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 the ba...

Claims

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Application Information

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Patent Type & Authority Applications(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