Carbon-ceramic coated aluminum foil current collector and preparation method therefor

A current collector, ceramic coating technology, applied in electrode carrier/current collector, electrical components, battery electrodes, etc., can solve the problem of unsatisfactory corrosion resistance, poor film-forming agent binding force, and poor coating wettability, etc. problems, to achieve the effects of good wettability, improved mechanical properties and stability, and low internal resistance

Inactive Publication Date: 2016-10-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the film-forming resin is also hydrophobic, and the wettability of the coating is not good.
In the use of power batteries, the coating has poor thermal conductivity, insufficient electrical conductivity, and unsatisfactory corrosion resistance
Coating stability decreases with battery age
These problems have greatly affected the performance of the battery
[0004] In conductive coatings based on

Method used

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  • Carbon-ceramic coated aluminum foil current collector and preparation method therefor
  • Carbon-ceramic coated aluminum foil current collector and preparation method therefor
  • Carbon-ceramic coated aluminum foil current collector and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A carbon-ceramic coated aluminum foil current collector, the aluminum foil of the current collector is coated with a slurry coating containing ceramics and carbon materials on at least one side, and the slurry is composed of the following components in weight percentage:

[0029]

[0030]

[0031] The preparation method of carbon-ceramic coating aluminum foil current collector:

[0032] Dissolve polyvinylpyrrolidone dispersant in deionized water, add defoamer, stir and mix evenly, add Al 2 o 3 Particles, then add carbon black and graphite flakes three times, pre-disperse at 1000r / min for 1 hour under circulating water cooling at 4°C; transfer to a sand mill, sand mill for 10 hours under circulating water cooling at 4°C, and add coupling agent KH-550, acrylic resin emulsion, and substrate wetting agent are fully stirred to form a slurry; after testing, the solid content of the slurry is 14.5%, and the viscosity at a shear rate of 10 / S is 26mPa·S.

[0033] The abo...

Embodiment 2

[0035] A carbon-ceramic coated aluminum foil current collector, the aluminum foil of the current collector is coated with a slurry coating containing ceramics and carbon materials on at least one side, and the slurry is composed of the following components in weight percentage:

[0036]

[0037]

[0038] The preparation method of carbon-ceramic coating aluminum foil current collector:

[0039] Dissolve polyvinylpyrrolidone dispersant in deionized water, add defoamer, stir and mix evenly, add BN particles, then add carbon black and graphene in three times, and pre-disperse at 1000r / min for 2 hours under the cooling condition of circulating water at 4°C ; Transfer to a sand mill, sand mill for 8 hours under circulating water cooling at 4°C, add coupling agent KH-560, water-based polyurethane emulsion, and substrate wetting agent, and stir well to form a slurry; after testing, the slurry The solid content is 22%, and the viscosity at 10 / S shear rate is 40mPa·S.

[0040] Th...

Embodiment 3

[0042] A carbon-ceramic coated aluminum foil current collector, the aluminum foil of the current collector is coated with a slurry coating containing ceramics and carbon materials on at least one side, and the slurry is composed of the following components in weight percentage:

[0043]

[0044] The preparation method of carbon-ceramic coating aluminum foil current collector:

[0045] Dissolve the carbon black dispersant in xylene, stir and mix evenly, add Si 3 N 4 Particles, then add carbon black and carbon nanotubes three times, pre-disperse at 1000r / min for 1.5h under circulating water cooling at 4°C; transfer to a sand mill, sand mill for 8h at 4°C circulating water cooling, add titanium The ester coupling agent and the phenolic resin are fully stirred to form a slurry; after testing, the solid content of the slurry is 17%, and the viscosity at a shear rate of 10 / S is 200mPa·S.

[0046] The above slurry was coated on an aluminum foil using a micro-gravure printing coa...

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Abstract

The invention discloses a carbon-ceramic coated aluminum foil current collector and a preparation method therefor. At least one surface of the current collector aluminum foil is coated with a slurry coating layer which contains ceramic and a carbon material; the slurry comprises the following components based on weight percentage: 1-20% of film forming agent, 1-5% of ceramic particles,1-20% of carbon material, 0.5-20% of dispersing agent, 0.5-4% of coupling agent, 40-95% of solvent, 0-0.3% of defoaming agent and 0-0.5% of base material wetting agent. The carbon-ceramic coated aluminum foil current collector has relatively high solvent resistance and low resistance; the current collector has high compatibility with the positive electrode slurry which takes N-methyl pyrrolidone as the solvent; the current collector is tight in adhesion; and in addition, the current collector has the advantages of excellent stability, high adhesive power, low internal resistance, high specific capacity, high rate capability and the like in use.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, in particular to a carbon-ceramic coated aluminum foil current collector and a preparation method thereof. Background technique [0002] With the promotion of new energy vehicles, lithium-ion batteries have the advantages of high specific capacity, good voltage stability and no memory, and have become the first choice for power batteries. The particularity of the power battery puts forward higher requirements on the specific capacity, consistency and high rate performance of the battery. At present, aluminum foil is used as the main positive electrode current collector on the market, and the positive electrode material is adhered to the smooth aluminum foil. The two are in point contact, the contact area is small, and the polarization resistance is high. Especially when charging and discharging at a high rate, the polarization increases, the temperature rises, and the raw materials a...

Claims

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Application Information

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IPC IPC(8): H01M4/66
CPCH01M4/667Y02E60/10
Inventor 陈政伦陈成张江伟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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