Non-woven fabric based multi-layer composite diaphragm for lithium ion battery and preparation method of multi-layer composite diaphragm

A lithium-ion battery, multi-layer composite technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of not being able to interrupt the electrochemical process in time, unable to prevent the temperature from rising continuously, and losing the safety protection function. Enhanced mechanical operability and puncture resistance, good liquid absorption and mechanical properties, improved high temperature closed cell performance

Active Publication Date: 2016-04-06
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of composite separator has no closed-cell function, and cannot interrupt the electrochemical process in time when the temperature rises, and cannot prevent the temperature from continuing to rise, so there are still certain safety hazards
[0005] CN103887464A discloses a method for filling the aperture of a non-woven membrane with thermoplastic particles. Although this structure has closed-cell performance, when the temperature is too high, the thermoplastic particles and the non-woven membrane will lose their safety protection function

Method used

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  • Non-woven fabric based multi-layer composite diaphragm for lithium ion battery and preparation method of multi-layer composite diaphragm
  • Non-woven fabric based multi-layer composite diaphragm for lithium ion battery and preparation method of multi-layer composite diaphragm
  • Non-woven fabric based multi-layer composite diaphragm for lithium ion battery and preparation method of multi-layer composite diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Mix 1g of polyethylene (PE) powder with a particle size of 100nm, 0.2g of sodium carboxymethylcellulose (CMC), 0.2g of styrene-butadiene rubber (SBR) and 10g of deionized water and stir evenly to obtain a mixed emulsion 1 .

[0036] 2. Mix 2g of aluminum oxide powder with a particle size of 200nm, 0.2g of sodium carboxymethylcellulose (CMC), 0.2g of styrene-butadiene rubber (SBR) and 10g of deionized water and stir evenly to obtain mixed emulsion 2 .

[0037] 3. Apply the mixed emulsion 1 evenly on one side of a polyethylene (PE) non-woven fabric diaphragm with a thickness of 20 μm and a porosity of 72% by a coating machine, and dry it at 80° C. to form a thermoplastic membrane with a thickness of 2 μm. material coating.

[0038] 4. The mixed emulsion 2 is uniformly coated on the surface of the thermoplastic material coating by a coating machine, and dried at 80° C. to form a ceramic coating with a thickness of 3 μm. After rolling, a three-layer composite diaphrag...

Embodiment 2

[0040] 1. Mix 1 g of polypropylene (PP) micropowder with a particle size of 200 nm, 0.2 g of polyvinylidene fluoride (PVDF) and 7 g of N-methylpyrrolidone and stir evenly to obtain mixed emulsion 1.

[0041] 2. Mix 2 g of zirconia powder with a particle size of 300 nm, 0.2 g of polyvinylidene fluoride (PVDF) and 7 g of N-methylpyrrolidone and stir evenly to obtain mixed emulsion 2.

[0042] 3. Apply the mixed emulsion 1 evenly on one side of the polyimide (PI) non-woven fabric diaphragm with a thickness of 10 μm and a porosity of 68% by a coating machine, and dry it at 80° C. to form a film with a thickness of 3 μm thermoplastic material coating.

[0043] 4. The mixed emulsion 2 is uniformly coated on the surface of the thermoplastic material coating by a coating machine, and dried at 80° C. to form a ceramic coating with a thickness of 5 μm. After rolling, a three-layer composite diaphragm A2 is formed.

Embodiment 3

[0045] 1. Mix 1.5 g of polystyrene (PS) micropowder with a particle size of 400 nm, 0.7 g of polyvinyl alcohol (PVA), 0.1 g of gelatin and 10 g of deionized water and stir evenly to obtain mixed emulsion 1.

[0046] 2. Mix 3g of silica powder with a particle size of 100nm, 0.7g of polyvinyl alcohol (PVA), 0.1g of gelatin and 10g of deionized water and stir evenly to obtain mixed emulsion 2.

[0047] 3. The mixed emulsion 1 is evenly coated on one side of a polyethylene terephthalate (PET) non-woven fabric diaphragm with a thickness of 15 μm and a porosity of 75% by a coating machine, and dried at 80° C. A coating of thermoplastic material was formed with a thickness of 4 μm.

[0048] 4. The mixed emulsion 2 is uniformly coated on the surface of the thermoplastic material coating by a coating machine, and dried at 80° C. to form a ceramic coating with a thickness of 3 μm. After rolling, a three-layer composite diaphragm A3 is formed.

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Abstract

The invention discloses a non-woven fabric based multi-layer composite diaphragm for a lithium ion battery and a preparation method of the multi-layer composite diaphragm. The non-woven fabric based multi-layer composite diaphragm comprises a non-woven fabric base material, an intermediate thermoplastic material coating and an outer-layer ceramic coating. The preparation method comprises the following steps of (1) mixing and uniformly stirring thermoplastic material particles, a binding agent and a solvent to form a mixed emulsion 1, and mixing and uniformly stirring inorganic particles, the binding agent and the solvent to form a mixed emulsion 2; and (2) uniformly applying the mixed emulsion 1 on one surface of the non-woven fabric base material, drying the mixed emulsion 1 to form the thermoplastic material coating, applying the mixed emulsion 2 on the thermoplastic material coating, drying the mixed emulsion 2 to form a ceramic coating, and rolling the ceramic coating to prepare a three-layer composite diaphragm. The three-layer composite diaphragm prepared according to the method has high-temperature obturator performance, favorable liquid absorption capability and mechanical property.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a non-woven fabric-based multilayer composite separator for lithium ion batteries and a preparation method thereof. Background technique [0002] The main function of the separator in a lithium-ion battery is to isolate the positive and negative electrodes and prevent electrons from passing through, while allowing lithium 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. Polyolefin materials have excellent mechanical properties, chemical stability and relatively cheap characteristics. They have been widely used in the early stage of lithium battery research and development, and have become the mainstream dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/414H01M50/434H01M50/451H01M50/457H01M50/494
CPCH01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 余心亮李文孙伟何文祥李靖赵冲冲
Owner TIANNENG SAFT ENERGY JOINT CO
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