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Lithium ion battery pole piece coating having heat dissipation function

A lithium-ion battery and coating technology, which is applied to battery electrodes, fuel cells, secondary batteries, etc., can solve the problems of lowering the internal temperature of the battery and the heat cannot be dissipated quickly, and achieve the effect of reducing the surface temperature of the battery

Inactive Publication Date: 2017-12-19
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a lithium-ion battery pole piece coating with heat dissipation function, which aims at the problem that a large amount of heat generated inside the battery cannot be quickly dissipated under the condition of high-current charging and discharging, and utilizes polydopamine and graphene to effectively Excellent thermal conductivity, 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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  • Lithium ion battery pole piece coating having heat dissipation function
  • Lithium ion battery pole piece coating having heat dissipation function
  • Lithium ion battery pole piece coating having heat dissipation function

Examples

Experimental program
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Embodiment 1

[0024] Dissolve 50g of dopamine monomer in HCl solvent to make dopamine concentration of 50mmol 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 on the current collector and tabs. 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, and the volume percentage of each substance in the above solvent is NMP : DMF: Isopropanol: PVDF=95:2:3:0.05, if PTFE is used as component 2, the volume percentage is 0.1%. The abov...

Embodiment 2

[0026] Dissolve 50g of dopamine monomer in HCl solvent to prepare a 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 10%; 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 still for 72 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 evenly deposited on the copper and aluminum foils. 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 solven...

Embodiment 3

[0028] 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, and then 1% by mass of CMC is added 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. Immerse the lithium-ion battery pole piece in the mixed solution and let it stand for 60h. After cleaning, it was vacuum-dried at 100°C for 2 hours. It was visible to the naked eye that a layer of light black coating was deposited on the current collector with a uniform texture. Coating 2 was prepared according to the steps of Example 2. The difference is that coating 2 is partially sprayed on coating 1 and coated on both sides to reduce the amount of graphene, as shown in the schematic diagram Figure 5 , Figure 6 shown.

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Abstract

The invention relates to a lithium ion battery pole piece coating having a heat dissipation function. The coating is characterized in that the coating 1 is prepared by 1) dissolving a dopamine monomer into a certain solvent to prepare an alkaline dopamine solution the dopamine concentration of which is 50-100 mmol.L<-1>; 2) uniformly dispersing graphene into a solvent; and 3) mixing the solutions prepared in the step 1) and the step 2), putting a battery current collector or a pole piece into the mixed solution, allowing the battery current collector or the pole piece to stand for 48-72 h, cleaning the battery current collector or the pole piece, and then drying the battery current collector or the pole piece at 80-120 DEG C to obtain the polydopamine-graphene composite coating. Aiming at a problem that a large quantity of heat generated inside a battery under high-current charge-discharge conditions cannot be dissipated rapidly, polydopamine and good heat conducting characteristics of graphene are utilized, and the current collector is coated with the polydopamine-graphene composite coating, thus further improving bonding strength between the current collector and an active compounds, and achieving a function of decreasing the inside temperature of the battery.

Description

technical field [0001] The invention relates to a lithium-ion battery pole piece coating with heat dissipation function, which has the function of improving the heat dissipation of tabs and current collectors, and is mainly used in the field of new energy storage units such as lithium-ion batteries, metal-air batteries, and supercapacitors; it belongs to the new field of 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. Among them, how to ensure the heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/613H01M10/654H01M10/0525H01M8/0228H01G11/68
CPCH01G11/68H01M4/667H01M4/668H01M8/0228H01M10/0525H01M10/613H01M10/654Y02E60/10Y02E60/50
Inventor 王丹赵中令陈慧明韩建张斌张克金
Owner CHINA FIRST AUTOMOBILE