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A battery pole piece substrate, its preparation method and application

A technology for battery pole pieces and substrates, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of easy falling off, low adhesion between alumina layer and thermoplastic resin film, etc., and achieve electronic conductivity High, improved bonding strength, and the effect of inhibiting peeling

Active Publication Date: 2020-10-09
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that in the prior art, the adhesion between the alumina layer and the thermoplastic resin film is not high, and it is easy to fall off during actual use

Method used

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  • A battery pole piece substrate, its preparation method and application
  • A battery pole piece substrate, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A preparation method of a positive electrode sheet substrate:

[0056] (1) Prepare an aluminum foil, and immerse it in an alkaline solution at 100° C. for 20 seconds for boehmite treatment to obtain a positive electrode collector with an aluminum oxide layer on the surface;

[0057] (2) Mix KH560 with alcohol to obtain a KH560 dispersion with a mass concentration of 30%, add alumina and stir at a mass ratio of alumina and KH560 dispersion of 1:5 to obtain modified alumina, and then 8wt% modified oxidation Aluminum, 8wt% carbon fiber, 8wt% zirconia and 76wt% polyvinylidene fluoride (PVDF) are uniformly mixed in a solvent to obtain a transition layer composition, and the transition layer composition is coated on the surface by a coating method. On the positive electrode current collector of the aluminum layer, a transition layer with a thickness of 100nm is obtained;

[0058] (3) Prepare a coating composition composed of 8wt% carbon fiber, 8wt% zirconia, and 84wt% polyvi...

Embodiment 2

[0060] A preparation method of a negative electrode sheet substrate:

[0061] (1) Prepare copper foil, disperse aluminum oxide in acetone, coat on copper foil, and then dry to obtain a negative electrode current collector with a thickness of 100nm aluminum oxide layer;

[0062] (2) Mix KH560 with alcohol to obtain a KH560 dispersion with a mass concentration of 30%, add alumina and stir with the mass ratio of alumina and KH560 dispersion at 1:5 to obtain modified alumina, and then mix 8wt% modified alumina , 8wt% carbon fiber, 8wt% zirconia and 76wt% polyvinylidene fluoride (PVDF) are uniformly mixed in a solvent to obtain a transition layer composition, and the transition layer composition is coated on the surface with aluminum oxide by coating. On the negative electrode current collector of layer, obtain the transition layer that thickness is 100nm;

[0063] (3) Prepare a coating composition composed of 8wt% carbon fiber, 8wt% zirconia, and 84wt% polyvinylidene fluoride (PV...

Embodiment 3

[0073] A preparation method of an all-solid-state lithium battery:

[0074] (1) Prepare the positive electrode sheet substrate of embodiment 1, the positive electrode active material LiCoO 2 1. Conductive carbon black is mixed with a PVDF solution dissolved in N-methylpyrrolidone (mass ratio is 95:3:2) to obtain a slurry, which is then coated on both sides of aluminum foil with a coating machine, and dried to obtain a positive electrode;

[0075] (2) Prepare the negative electrode sheet substrate of Example 2, mix carbon material (graphite) and CMC (mass ratio is 95:3), adjust into slurry, then coat on both sides of copper foil, dry, and obtain negative electrode;

[0076] (3) Lithium lanthanum zirconium oxide, polytetrafluoroethylene emulsion, and lithium bistrifluoromethanesulfonylimide are mixed uniformly in nitrogen methyl pyrrolidone solvent to obtain a coating slurry, which is respectively coated on the surface of the positive electrode and the negative electrode. The n...

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Abstract

The invention discloses a battery pole piece substrate as well as a preparation method and application thereof. The battery pole piece substrate comprises a current collector, and an aluminum oxide layer, a transition layer and a thermoplastic resin film which are sequentially arranged on a surface of the current collector, and the transition layer comprises aluminum oxide and first thermoplasticresin. The problems that the cohesiveness of an aluminum oxide layer and a thermoplastic resin film is not high in the prior art, and the falling in the actual use process is easy are solved. The transition layer is arranged between the aluminum oxide layer and the thermoplastic resin film, so that the bonding strength of the aluminum oxide layer and the thermoplastic resin film is greatly improved, and the thermoplastic resin film is prevented from falling from the aluminum oxide layer; furthermore, by selecting the types of the thermoplastic resin film and the transition layer resin, part ofthe adhesive property can be sacrificed, but the service life of the battery can be greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of new energy lithium batteries, and in particular relates to a battery pole piece base, its preparation method and application. Background technique [0002] Since the promotion of commercialization, lithium-ion batteries have been widely used in various portable batteries due to their advantages such as high energy density, high working voltage, long cycle life, no memory effect, green environmental protection, and flexible design of size and shape according to actual needs. Power supplies for consumer electronics. The new energy vehicle market has huge prospects. As an important chemical power source, lithium-ion batteries are widely used in mobile communication equipment, electric tools, electric bicycles, etc. The demand for lithium-ion batteries and related supporting industries is increasing. [0003] At present, liquid electrolyte lithium batteries have been widely used, but liquid electrolyte lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/667H01M4/668H01M10/0525Y02E60/10
Inventor 李峥冯玉川何泓材周柯王丹丹杨帆南策文
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD