A kind of composite current collector and preparation method thereof

Abstract

The invention relates to a preparation method of a composite current collector, which belongs to the field of batteries. The preparation method includes: 1) Current collector pretreatment: first use ethanol, acetone and deionized water to remove the oil stains on the current collector in an ultrasonic cleaner, and dry it for later use; 2) Coating carbon slurry: first Configure the MOF solution, then place the current collector in step 1) in the solution, dry it after reaction, and wait for use; 3) Dry carbonization: place the dried current collector in step 2) in a protective atmosphere and heat it under high temperature Carbonization to obtain a current collector with a coating layer on the surface; 4) Pickling: pickling step 3) the current collector to remove non-carbon substances on the surface of the current collector to obtain a current collector with a carbon coating; 5) Drying and milling Pressing: drying and rolling the obtained current collector. In the present invention, the carbonized metal frame is used as the current collector coating after the carbonization, the coating and the substrate have strong bonding force, the coating is not easy to fall off, and the obtained battery has good cycle performance.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a composite current collector and a preparation method thereof. Background technique [0002] The technical scheme of the pole piece used in the existing lithium-ion power battery is to directly use a current collector with a thickness of 9-20 μm, and coat the active material to make the pole piece. Its shortcoming is that the surface roughness of ordinary current collectors is low and the specific surface area is small. After coating the negative electrode slurry, the adhesion between the light foil and the slurry will be relatively poor, which will cause the pole piece to be cut in the subsequent cutting process. Partial or even large-area material drop is prone to occur in the process of , punching, and transfer, which reduces the pass rate of the product and increases the cost. On the other hand, if the contact resistance between the current collector and the active mate...

AI Technical Summary

Problems solved by technology

Its shortcoming is that the surface roughness of ordinary current collectors is low and the specific surface area is small. After coating the negative electrode slurry, the adhesion between the light foil and the slurry will be relatively poor, which will cause the pole piece to be cut in the subsequent cutting process. Partial or even large-area material drop is prone to occur in the process of , punching and transferring, which reduces the pass rate of the product and increases the cost

This carbon film has limited ability to reduce contact resistance; therefore, it is necessary to study a new composite current collector

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