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A lithium ion battery separator with alternating coating structure and preparation method thereof

A lithium-ion battery and coating technology, applied in structural parts, secondary batteries, battery pack parts, etc. It can shorten the production cycle, reduce the internal resistance, and improve the wettability.

Active Publication Date: 2022-07-29
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adhesive-coated separators can meet the heat shrinkage resistance and bonding performance requirements of the separator, but the adhesion between the separator and the pole piece is too high, which makes the wettability of the electrolyte worse, resulting in the DC internal resistance of the battery (DCR) increases, which affects the performance of rate performance, discharge capacity and service life, and even leads to lithium deposition in the battery; in addition, this kind of separator needs to be coated with PVDF coating after coating the ceramic coating during the preparation process. layer, so the preparation process is more complicated and the production cycle is longer

Method used

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  • A lithium ion battery separator with alternating coating structure and preparation method thereof
  • A lithium ion battery separator with alternating coating structure and preparation method thereof
  • A lithium ion battery separator with alternating coating structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A lithium-ion battery separator with an alternating coating structure was prepared as follows:

[0034] (1) Preparation of ceramic slurry: Mix 62 parts of boehmite, 25 parts of carboxymethyl cellulose, 1 part of ammonium acrylate and 12 parts of polyacrylate, and disperse them in enough deionized water, stir evenly to obtain ceramic slurry material.

[0035] (2) Preparation of PVDF-ceramic mixture slurry: Dissolve 1 part of PVDF polymer into a sufficient amount of NMP to obtain a PVDF polymer solution, and then disperse 99 parts of boehmite into the PVDF polymer solution to obtain a PVDF-ceramic mixture slurry.

[0036] (3) If figure 1 and figure 2 As shown, the PVDF-ceramic mixture slurry was applied to both sides and the center of both sides of the base membrane, and the ceramic slurry was applied to the remaining area of ​​the base membrane surface with a coating thickness of 3 μm on each side, PVDF-ceramic The widths of the mixture coating and the ceramic coati...

Embodiment 2

[0038] A lithium-ion battery separator with an alternating coating structure was prepared as follows:

[0039] (1) Preparation of ceramic slurry: Mix 62 parts of boehmite, 25 parts of carboxymethyl cellulose, 1 part of ammonium acrylate and 12 parts of polyacrylate, and disperse them in enough deionized water, stir evenly to obtain ceramic slurry material.

[0040] (2) Preparation of PVDF-ceramic mixture slurry: dissolve 25 parts of PVDF polymer into a sufficient amount of NMP to obtain a PVDF polymer solution, and then disperse 75 parts of boehmite into the PVDF polymer solution to obtain a PVDF-ceramic mixture slurry.

[0041] (3) If figure 1 and figure 2 As shown, the PVDF-ceramic mixture slurry was applied to both sides and the center of both sides of the base membrane, and the ceramic slurry was applied to the remaining area of ​​the base membrane surface with a coating thickness of 3 μm on each side, PVDF-ceramic The widths of the mixture coating and the ceramic coa...

Embodiment 3

[0043] A lithium-ion battery separator with an alternating coating structure was prepared as follows:

[0044] (1) Preparation of ceramic slurry: Mix 62 parts of boehmite, 25 parts of carboxymethyl cellulose, 1 part of ammonium acrylate and 12 parts of polyacrylate, and disperse them in enough deionized water, stir evenly to obtain ceramic slurry material.

[0045] (2) Preparation of PVDF-ceramic mixture slurry: dissolve 50 parts of PVDF polymer into a sufficient amount of NMP to obtain a PVDF polymer solution, and then disperse 50 parts of boehmite into the PVDF polymer solution to obtain a PVDF-ceramic mixture slurry.

[0046] (3) If figure 1 and figure 2 As shown, the PVDF-ceramic mixture slurry was applied to both sides and the center of both sides of the base membrane, and the ceramic slurry was applied to the remaining area of ​​the base membrane surface with a coating thickness of 3 μm on each side, PVDF-ceramic The widths of the mixture coating and the ceramic coati...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery separator with an alternate coating structure and a preparation method thereof. The lithium ion battery separator includes a base film and a coating applied to one or both sides of the base film, the coating including a ceramic coating and a PVDF-ceramic mixture coating; the ceramic coating and the PVDF-ceramic mixture coating The layers are arranged at intervals in the same coating plane, and the two edges of the coating are PVDF-ceramic mixture coatings; the area of ​​the PVDF-ceramic mixture coatings accounts for 30% to 90% of the entire coating area. By arranging the ceramic coating and the PVDF-ceramic mixture coating at intervals, the lithium ion battery separator of the present invention can maintain sufficient thermal shrinkage resistance of the separator and sufficient adhesion between the separator and the pole piece, and at the same time improve the electrolyte resistance. wettability, thereby reducing the DC internal resistance of lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery separator with an alternate coating structure and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, high operating voltage, high load capacity, no memory effect, low self-discharge rate, fast charging, and environmental friendliness, so they are widely used in consumer electronics, electric vehicles, power stations Energy storage power system, uninterruptible power supply, military equipment and other fields. A general lithium-ion battery mainly includes four parts: positive electrode, negative electrode, electrolyte and separator. Among them, the separator is located between the positive and negative electrodes of the battery, and is generally a porous polymer film, which mainly plays the following functions: (1) separates the positive and negative el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/434H01M50/446H01M50/451H01M50/457H01M50/403H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 张睿成石俊黎许梦清孟宪伟邱申
Owner WANXIANG 123 CO LTD
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