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A carbon-coated current collector containing polydopamine

A technology of polydopamine and current collectors, which is applied in the direction of electrode carriers/collectors, structural parts, electrical components, etc., can solve the problems of reducing battery temperature and heat can not be quickly dissipated, and achieve the effect of reducing battery surface temperature

Active Publication Date: 2020-08-25
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 carbon-coated current collector containing polydopamine. Aiming at the problem that a large amount of heat generated inside the battery cannot be quickly dissipated under high-current charging and discharging conditions, the good thermal conductivity of polydopamine and graphene is used. The surface of the current collector is coated with a composite coating of graphene and polydopamine, which further improves the bonding strength between the current collector and the active material, and at the same time, achieves the effect of reducing the internal temperature of the battery

Method used

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  • A carbon-coated current collector containing polydopamine
  • A carbon-coated current collector containing polydopamine

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Experimental program
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Effect test

Embodiment 1

[0017] Such as figure 1 Dissolve the dopamine monomer in a certain amount of HCl as shown, and prepare the dopamine concentration as 50mmol•••L -1 Alkaline solution, the pH value of the solution is 8.9; the copper current collector and aluminum current collector of the lithium-ion battery are immersed in the above solution, let stand for 24 hours, cleaned, dried at a temperature range of 100 ° C under vacuum conditions, and placed to Stand by after room temperature; then the components containing graphene, natural graphite and hard carbon (the mass percentage of graphene, natural graphite and hard carbon is 0.5:83:16.5) are uniformly dispersed in the solvent, the volume of each substance in the above solvent The percentage is NMP:DMF:isopropanol:PVDF=95:2:3:0.05, if PTFE is used as component 2, the volume percentage is 0.1%. Spray the above-mentioned uniformly mixed and dispersed substances on the copper current collector and the aluminum current collector, coat both sides, a...

Embodiment 2

[0019] Dissolve the dopamine monomer in a certain amount of HCl to prepare a dopamine concentration of 100mmol•••L -1 Alkaline solution, the pH value of the solution is 9.5; the copper current collector and aluminum current collector of the lithium-ion battery are immersed in the above solution, let stand for 48 hours, cleaned, dried in the temperature range of 110 °C under vacuum conditions, and placed to Standby after room temperature; then the components containing graphene, natural graphite, artificial graphite and soft carbon (wherein the mass percentage of graphene, natural graphite, artificial graphite and soft carbon is 1.5:55:38.5:5) are uniformly dispersed in the solvent , the mass percentage of each substance in the above solvent is water: CMC=99.5:0.5, wherein the mass percentage of sodium dodecylsulfonate is 0.005%, and the solution temperature is 80°C. The above mixed and dispersed material is sprayed onto the copper On the current collector and the aluminum curr...

Embodiment 3

[0021] Dissolve the dopamine monomer in a certain amount of HCl to prepare a dopamine concentration of 80mmol•••L -1 Alkaline solution with a pH value of 8.5; dip the nickel current collector of the zinc-air battery in the above solution, let it stand for 30 hours, wash it, dry it in a temperature range of 120°C under vacuum conditions, and place it at room temperature for later use; Then the components containing graphene and natural graphite (the mass percentage of graphene and natural graphite is 1.5:98.5) are uniformly dispersed in the solvent, and the mass percentage of each substance in the above solvent is water: CMC=99.9:0.1, wherein poly The mass percentage of vinyl alcohol (PVA) and sodium lignosulfonate (SLS) is 0.003% (the mass percentage of the two substances is 1:3), and the above-mentioned mixed and dispersed substances are sprayed on the copper current collector and the aluminum current collector On, one side coating, 100 ℃ vacuum heating to remove volatile sub...

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Abstract

The present invention relates to a carbon-coated current collector containing polydopamine, the coating contains the polydopamine and graphene, the carbon-coated current collector is characterized in that specific coating steps are as follows: (1) dissolving a dopamine monomer in a certain amount of HCl solvent to prepare an alkaline solution with the dopamine concentration of 50-100mmol.L<-1>; (2) immersing a current collector in the step (1) solution, standing for 24h-48h, washing, drying under vacuum at 100-120 DEG C, placing to room temperature for standby use; and (3) uniformly dispersing graphene-containing carbon in the solvent; the carbon-coated current collector aims at the problem that under the conditions of high-current charging and discharging, a large amount of heat is generated inside a battery and cannot be dissipated rapidly, good thermal conductivity of the polydopamine and the graphene are used, the surface of the current collector is coated with a composite coating of the graphene and the polydopamine, the bonding strength between the current collector and an active material is further improved, and the internal temperature of the battery is reduced.

Description

technical field [0001] The invention relates to a carbon-coated current collector containing polydopamine, which is a composite coating containing polydopamine and graphene, which has the function of improving the heat dissipation of tabs and current collectors, and is mainly used in lithium-ion batteries, metal-air batteries, supercapacitors, etc. The field of energy storage unit belongs to the field of new energy technology. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/613H01M10/625H01M10/653H01M10/654
CPCH01M4/663H01M4/667H01M4/668H01M10/613H01M10/625H01M10/653H01M10/654Y02E60/10
Inventor 王丹赵中令陈慧明韩建张斌张克金
Owner CHINA FIRST AUTOMOBILE