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Composite non-woven fabric ceramic diaphragm for lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and ceramic diaphragms, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of poor heat resistance, easy water absorption, and easy falling off of the diaphragm, achieve good wetting characteristics, and increase high temperature resistance The effect of the characteristic

Active Publication Date: 2016-02-03
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a composite non-woven ceramic diaphragm for lithium ion batteries and a preparation method thereof, which solves the problems of poor heat resistance, easy water absorption, easy falling off, and low mechanical strength of the lithium ion battery diaphragm.

Method used

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  • Composite non-woven fabric ceramic diaphragm for lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] At room temperature, add 1.5 g of sodium carboxymethylcellulose (CMC) and 0.1 g of styrene-butadiene rubber (SBR) into 100 mL of deionized water, stir at 60°C for 1 hour, and then continue to stir at room temperature for 8 hours. It is fully dissolved to form a colorless and transparent glue. Add 2g of aluminum oxide powder with a particle size of 40nm to the glue solution and stir for 8 hours to fully disperse it in the sol to form an organic-inorganic mixture. Then the mixture is uniformly coated on one side of the polyethylene non-woven membrane by a coating machine with a thickness of 4 μm. With the coated side facing up, another non-woven membrane of the same specification is quickly pressed on the coated surface to make two The non-woven fabric separators are tightly attached together, then dried at 110°C, and finally rolled to form the non-woven fabric ceramic composite separator A1 with a sandwich structure.

Embodiment 2

[0035] At room temperature, add 4g of polyvinylidene fluoride (PVDF) into 100mL of deionized water, stir at 60°C for 1 hour, and then continue to stir at room temperature for 8 hours to fully dissolve it to form a colorless and transparent glue. Add 2g of Al2O3 powder with a particle size of 1 μm to the glue solution, stir for 8 hours to fully disperse it in the sol to form an organic-inorganic mixture. Then the mixture is uniformly coated on one side of the polyethylene non-woven membrane by a coating machine with a thickness of 4 μm. With the coated side facing up, another non-woven membrane of the same specification is quickly pressed on the coated surface to make two The non-woven fabric separators are tightly bonded together, then dried at 110°C, and finally rolled to form a sandwich-structured non-woven ceramic composite separator A2.

Embodiment 3

[0037]At room temperature, add 2g of carboxymethylcellulose sodium (CMC) into 100mL of deionized water, stir at 60°C for 1 hour, and then continue to stir at room temperature for 8 hours to fully dissolve it to form a colorless and transparent glue . Add 3g of silicon dioxide powder with a particle size of 200nm to the glue, and stir for 8 hours to fully disperse it in the sol to form an organic-inorganic mixture. Then the mixture is uniformly coated on one side of the polyamide non-woven fabric diaphragm by a coating machine, with a thickness of 6 μm. With the coated side facing up, quickly press another non-woven fabric diaphragm of the same specification on the coated surface, so that the two sheets The non-woven fabric separators are tightly attached together, then dried at 110°C, and finally rolled to form a sandwich-structured non-woven ceramic composite separator A3.

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Abstract

The invention discloses a composite non-woven fabric ceramic diaphragm for a lithium ion battery and a preparation method thereof. The composite non-woven fabric ceramic diaphragm for the lithium ion battery comprises two layers of non-woven fabric base materials and a ceramic coating composited between the two layers of non-woven fabric base materials. The preparation method comprises the following steps: (1) dissolving macromolecule organic matter in a solvent to form macromolecular solution; (2) dispersing inorganic particles in the macromolecular solution to form organic and inorganic mixture; (3) first coating one side of one non-woven fabric base material evenly with the organic and inorganic mixture, and then pressing the other layer of non-woven fabric base material on a coating layer, and performing drying and rolling to form the composite diaphragm. The problems that the lithium ion battery diaphragm is poor in heat resistance, absorbs water easily, drops easily and is not high in mechanical strength are solved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a composite non-woven ceramic separator for lithium-ion batteries and a preparation method thereof. Background technique [0002] The separator is one of the key components in a lithium-ion battery. Its main function is to isolate the positive and negative electrodes and prevent electrons from passing through, while allowing ions to pass through, thereby completing the rapid transmission of lithium ions between the positive and negative electrodes during charge and discharge. The performance of the separator directly affects the battery internal resistance, discharge capacity, cycle life and battery safety performance. At present, lithium-ion battery separator materials are mainly polyolefin separators, such as single-layer polypropylene (PP) microporous membranes, single-layer polyethylene (PE) microporous membranes, and three-layer PP / PE / PP composite m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/434H01M50/44H01M50/454H01M50/457
CPCH01M10/0525H01M50/431H01M50/403H01M50/449Y02E60/10
Inventor 孙伟余心亮李文施利勇何文祥李靖赵冲冲李萌萌
Owner TIANNENG SAFT ENERGY JOINT CO
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