Diaphragm and lithium battery using diaphragm

A lithium battery and diaphragm technology, applied in the field of diaphragms and lithium batteries using the diaphragm, can solve the problems of easy bending and deformation, internal resistance, deformation and unevenness, and achieve the avoidance of deformation and unevenness, high quality yield, and process steps and the effect of using a clear range of parameters

Active Publication Date: 2021-02-09
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is to overcome the problems of the prior art that the lithium battery is easy to bend and deform and the internal resistance at the interface of the diaphragm is large, and provides a diaphragm and a battery using the diaphragm For lithium batteries, there are differences in the coatings on both sides of the diaphragm of the present invention. This difference is mainly to meet the different requirements for the coating of the positive and negative electrodes of the lithium battery. The battery structure formed in this way will not limit the internal stress and deformation, thereby avoiding the deformation and unevenness of the battery cell caused by directly bonding the positive electrode, the separator, and the negative electrode together, and can better match the characteristics of the positive and negative electrodes, thereby further optimizing the battery capacity, cycle life and safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of the diaphragm and the lithium battery using the diaphragm comprises the following preparation steps:

[0034] 1) Coating preparation: dissolving ceramic powder aluminum oxide and polymer polyvinylidene fluoride in solvent acetone and dispersing into a uniform slurry, the mass content of the ceramic and polymer is 10%, and it is used in the coating on the A side , the ratio of ceramics and polymers is 40%: 60%, for the B surface coating, the ratio of ceramics and polymers is 0%: 100%;

[0035] 2) Coating: apply the coating to the surface of the base film by coating equipment, first coat the A side, then dry, then coat the B side, and then dry to obtain the separator;

[0036] 3) Prepare the battery structure: prepare the lithium iron phosphate positive pole piece and the graphite negative pole piece by winding or lamination process, and bond the positive pole piece with the diaphragm A surface under the action of hot pressing, and the negative p...

Embodiment 2

[0039] The difference from Example 1 is that the preparation method of the diaphragm and the lithium battery using the diaphragm includes the following preparation steps: 1) Preparation of coating: ceramic powder barium sulfate and polymer poly(vinylidene fluoride-co- Hexafluoropropylene) is dissolved in the solvent acetone and dispersed into a uniform slurry, and the mass content of the ceramics and the polymer is 15%. In the coating on the A side, the ratio of the ceramics and the polymer is 50%: 50%. In the paint on side B, the proportion of ceramics and polymers is 20%: 80%;

[0040] 2) Coating: apply the coating to the surface of the base film by coating equipment, first coat the A side, then dry, then coat the B side, and then dry to obtain the separator;

[0041] 3) Prepare the battery structure: prepare lithium nickel manganese oxide positive pole piece and lithium titanate negative pole piece by winding or stacking process, and bond the positive pole piece with the A ...

Embodiment 3

[0044]The difference from Example 1 is that the preparation method of the separator and the lithium battery using the separator includes the following preparation steps: 1) Preparation of coating: dissolving ceramic powder aluminum oxide and polymer polyvinylidene fluoride in a solvent Disperse into a homogeneous slurry in acetone, the mass content of said ceramics and polymers is 20%, for the coating on side A, the ratio of ceramics and polymers is 60%: 40%, used in the coating on side B, ceramics And the ratio of polymer is 30%:70%;

[0045] 2) Coating: apply the coating to the surface of the base film by coating equipment, first coat the A side, then dry, then coat the B side, and then dry to obtain the separator;

[0046] 3) Prepare the battery structure: prepare the positive pole piece and the negative pole piece by winding or stacking process, and bond the positive pole piece to the A side of the separator under the action of hot pressing, and bond the negative pole piec...

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Abstract

The invention relates to the technical field of lithium battery diaphragm materials, and discloses a diaphragm and a lithium battery using the diaphragm so as to solve the problems that a lithium battery in the prior art is easy to bend and deform and the internal resistance at a diaphragm interface is relatively large. The diaphragm is provided with a coating on at least one surface, and when thetwo surfaces of the diaphragm are both provided with coatings, respectively a surface A and a surface B, the adhesive forces between the coatings on the two surfaces and the diaphragm are obviously different. The preparation method of the diaphragm and the lithium battery using the diaphragm comprises the following preparation steps: preparing a coating; performing coating; and preparing a battery structure. The coatings on the two sides of the diaphragm are different, so that the formed battery core structure cannot limit internal stress and deformation of the positive plate and the negativeplate, deformation and unevenness of the battery core caused by direct bonding of the positive plate, the diaphragm and the negative plate are avoided, characteristics of a positive electrode and a negative electrode can be better matched, and capacity exertion, cycle life and safety of the battery are further optimized.

Description

technical field [0001] The invention relates to the technical field of diaphragm materials for lithium batteries, in particular to a diaphragm and a lithium battery using the diaphragm. Background technique [0002] The separator material of the existing lithium battery is usually a battery in which the positive electrode, the separator, and the negative electrode are bonded together by hot pressing. Due to the difference in stress and orientation of the positive electrode and the negative electrode, the battery is often easily bent and deformed, which in turn affects the capacity of the battery and the cycle. performance. At the same time, the coating on the surface of the separator will still have a strong bond with the base film after hot pressing. This bond will easily cause the coating to block the pores in the base film, resulting in an increase in the internal resistance of the battery, and will also cause battery damage. Decrease in capacity, lithium precipitation a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/446H01M50/449H01M10/052H01M10/0585H01M10/0587
CPCH01M10/052H01M10/0585H01M10/0587Y02E60/10Y02P70/50
Inventor 石俊黎唐通马子朋穆鑫许梦清
Owner WANXIANG 123 CO LTD
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