Current collector and manufacturing method thereof

A current collector and three-dimensional technology, which is applied in the direction of electrode carriers/collectors, electrical components, battery electrodes, etc., can solve the problem of weak connection between electrode materials and current collectors, affecting the performance of the electrochemical system, and the electronic conduction ability of electrode pole pieces Poor problems, to achieve the effect of ensuring electrochemical performance, improving electronic conduction ability, and increasing bonding strength

Active Publication Date: 2020-01-10
宁波铵特姆新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The coating-modified current collector is obtained by coating the modified coating on the surface of aluminum foil, copper foil or other conductive substrates; The weak connection between the surface coating and the electrode material layer leads to weak connection between the electrode material and the current collector, which makes the overall electronic conduction ability of the electrode sheet poor, which affects the performance of the electrochemical system under high current charge and discharge conditions. , and cause safety hazards

Method used

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preparation example Construction

[0036] Another object of the present invention is to provide a method for preparing a current collector, the method comprising the steps of:

[0037] S1: Mix conductive material, polymer binder, conductive polymer and solvent, emulsify and grind to obtain conductive coating slurry;

[0038] S2: Perform surface roughening pretreatment on the base layer to obtain a pretreated base layer;

[0039]S3: Using a positive-phase printing coater with a regular three-dimensional grid structure plate roller, the conductive coating slurry is coated on the surface of the pretreated base layer, and baked and dried at 50°C to 200°C to obtain current collector.

[0040] Among them, the material selection of conductive material, polymer binder, conductive polymer and base layer is the same as above, and will not be repeated in this paper; the mass percentage range of conductive material is 20% to 80%; the quality of polymer binder The percentage range is 1% to 40%; the mass percentage range o...

Embodiment 1

[0048] S1: Mix 9g of carbon black, 3.5g of modified polyurethane, 2.5g of polythiophene and 85g of N-methylpyrrolidone, emulsify and grind to obtain a conductive coating slurry;

[0049] S2: Perform solution cleaning, corona, and high-temperature annealing on the aluminum foil of the base layer in sequence to obtain a pretreated aluminum foil;

[0050] S3: Add the conductive coating slurry into the feed tank of the coating machine, and use a positive phase printing coating machine with a regular three-dimensional hexagonal grid structure plate (the grid structure on the plate roll is 250 mesh, engraved The depth is 15 μm), the conductive coating slurry is coated on the surface of the pretreated aluminum foil, and baked and dried at 120 ° C, the coating speed is 120 m / min, and the finished product is wound up to obtain a conductive coating thickness of 0.7 μm, a current collector with a hexagonal lattice structure on the surface.

[0051] see figure 2 As shown, the conductiv...

Embodiment 2

[0059] S1: Mix 3g carbon black, 6g polyacrylic acid, 6g polythiophene and 85g N-methylpyrrolidone, emulsify and grind to obtain a conductive coating slurry;

[0060] S2: Perform solution cleaning, corona, and high-temperature annealing on the aluminum foil of the base layer in sequence to obtain a pretreated aluminum foil;

[0061] S3: Add the conductive coating slurry into the feed tank of the coating machine, and use a positive-phase printing coating machine with a regular three-dimensional diamond-shaped grid structure plate roll (the grid structure on the plate roll is 200 mesh, and the engraving depth is 20 μm), the conductive coating slurry is coated on the surface of the pretreated aluminum foil, and baked and dried at 120 ° C, the coating speed is 150 m / min, and the finished product is wound to obtain a conductive coating with a thickness of 0.5 μm. A current collector with a diamond lattice structure on the surface.

[0062] The process of testing the current collect...

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Abstract

The invention provides a current collector and a manufacturing method thereof, and relates to the chemical power supply technology field. The current collector comprises a conductive substrate layer and at least one conductive coating with a regular three-dimensional grid structure. The conductive coating is coated on the substrate layer. By using the current collector, the at least one layer of conductive coating with the regular three-dimensional grid structure is coated on the conductive substrate layer so that a contact area between an electrode material and the conductive coating can be increased. Bonding strength of the current collector and the electrode material is improved, and simultaneously an electron conduction capability between the current collector and the electrode material is increased so that a usage amount of a binder is reduced while electrochemical performance of the current collector is ensured.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a current collector and a preparation method thereof. Background technique [0002] Current collectors used in electrochemical systems, the main function is to provide good electronic conductivity; current collectors in the prior art include directly using aluminum foil, copper foil or other base films with electronic conductivity as current collectors, and Coating-modified current collectors. [0003] The coating-modified current collector is obtained by coating the modified coating on the surface of aluminum foil, copper foil or other conductive substrates; The weak connection between the surface coating and the electrode material layer leads to weak connection between the electrode material and the current collector, which makes the overall electronic conduction ability of the electrode sheet poor, which affects the performance of the electrochemical system und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66
CPCH01M4/667Y02E60/10
Inventor 不公告发明人
Owner 宁波铵特姆新能源科技有限公司
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