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A lithium ion battery separator and a preparation method thereof

A lithium-ion battery and diaphragm technology, which is applied in the field of lithium-ion battery diaphragm and its preparation, can solve the problems of large air loss, diaphragm blockage, battery capacity and performance limitations, etc., and achieve good production performance and improved dispersion effect.

Inactive Publication Date: 2018-12-18
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing coating technology for PVDF separators of lithium-ion batteries generally adopts an oily coating process. Due to the good compatibility between the oily slurry and the material of the separator, the slurry will penetrate into the micropores of the base film, resulting in a large loss of air permeability. It is easy to cause the diaphragm to block holes, affect the performance of the battery, reduce the effective use space of the positive and negative materials in the battery, and limit the capacity and performance of the battery

Method used

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  • A lithium ion battery separator and a preparation method thereof
  • A lithium ion battery separator and a preparation method thereof
  • A lithium ion battery separator and a preparation method thereof

Examples

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preparation example Construction

[0029] The present invention also provides a kind of preparation method of above-mentioned lithium-ion battery diaphragm, comprises the following steps:

[0030] Take the proportioned amount of tannic acid and deionized water, mix and stir the two, then add PVDF resin powder and stir to make a mixture, and then mix it with other components, and coat it on one or both sides of the base film.

[0031] In some embodiments, take proportioned amounts of tannic acid and deionized water, stir for 1-3 hours, and mix uniformly to obtain mixture 1;

[0032] Add a proportional amount of PVDF resin powder to the above mixture 1, stir for 2-4 hours to form a uniform and stable suspension, and obtain mixture 2;

[0033] Add a proportioned amount of thickener, defoamer, binder and wetting agent to the above mixture 2, and grind for 1-2 hours to obtain an aqueous PVDF slurry;

[0034] The above-mentioned water-based PVDF slurry is coated on one or both sides of the polyolefin base film, and ...

Embodiment 1

[0040] A lithium-ion battery separator, comprising a base film and a PVDF coating coated on one side or both sides of the base film, the PVDF coating is obtained by coating a water-based PVDF slurry, and the coating thickness is 1 μm.

[0041]Among them, the water-based PVDF slurry contains 10%-12% base material according to weight percentage, and the balance is deionized water. The base material includes the following parts by mass: 10 parts of PVDF resin powder, 0.05 parts of dispersant, 1 part of thickener parts, 0.25 parts of defoamer, 0.5 parts of binder, and 0.25 parts of wetting agent.

Embodiment 2

[0043] A lithium-ion battery separator, comprising a base film and a PVDF coating coated on one side or both sides of the base film, the PVDF coating is obtained by coating a water-based PVDF slurry, and the coating thickness is 2 μm.

[0044] Wherein, the water-based PVDF slurry contains 10%-12% base material according to weight percentage, and the balance is deionized water. The base material includes the following materials in parts by mass: 20 parts of PVDF resin powder, 0.8 parts of dispersant, 2 parts of thickener parts, 0.4 parts of defoamer, 0.8 parts of binder, and 0.4 parts of wetting agent.

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Abstract

The invention discloses a lithium ion battery separator, comprising a base film and a PVDF coating coated on one side or two sides of the base film. The PVDF coating is obtained by coating aqueous PVDF slurry and drying, and the coating thickness is 1. 3[mu]m. The invention overcomes the poor dispersion effect of common PVDF in aqueous solution, and the common aqueous PVDF coating is unevenly distributed on the base membrane, resulting in clustering phenomenon, which leads to the poor performance of the separator. PVDF dispersion in aqueous solution is obviously improved, and the phenomenon ofcoagulation does not occur, and the PVDF coating is evenly distributed on the base membrane. The green and pollution-free system is used, and the separator with good performance is produced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery diaphragm and a preparation method thereof. Background technique [0002] The composition of lithium-ion batteries includes positive electrodes, negative electrodes, separators and electrolytes. As one of the four major materials of lithium-ion batteries, the separator is a key inner layer component in lithium batteries, although it does not participate in the electrochemical reactions in the battery. Key properties such as battery capacity, cycle performance, and charge-discharge current density are directly related to the separator, and the safety of the separator is an important factor affecting the safety of lithium-ion batteries. At present, the large-scale commercial lithium-ion battery diaphragm is mainly made of polyolefin. As the performance requirements of lithium-ion batteries are getting higher and higher, it is difficul...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/411H01M50/426H01M50/449
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 徐锋袁海朝孟欣欣苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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