High-temperature resistant multi-layer separator composite lithium ion battery separator and preparation method thereof

A lithium-ion battery and diaphragm composite technology, which is applied to battery pack components, circuits, electrical components, etc., can solve the problems of poor resistance to lithium dendrite penetration and achieve low cost, improved safety, and extended cycle life. Effect

Active Publication Date: 2017-07-14
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the poor penetration resistance of lithium-ion battery separators in the prior art and cause safety problems, th...

Method used

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  • High-temperature resistant multi-layer separator composite lithium ion battery separator and preparation method thereof
  • High-temperature resistant multi-layer separator composite lithium ion battery separator and preparation method thereof
  • High-temperature resistant multi-layer separator composite lithium ion battery separator and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Two 9μm wet-process PE separators are selected, and Al is used between the two wet-process PE separators. 2 o 3 Ceramic coating slurry is composited into a structure of PE separator-Al 2 o 3 Composite lithium-ion battery separator with ceramic coating-PE separator. where Al 2 o 3 The thickness of the ceramic coating is 2 μm, and the thickness of the prepared composite lithium-ion battery diaphragm is 20 μm.

[0055] The high temperature-resistant multi-layer diaphragm composite lithium-ion battery diaphragm of the present invention can be prepared by a traditional process, and a more optimal choice is to prepare it by the method of the present invention as follows:

[0056] A. Preparation of coating slurry: take the following raw materials by mass percentage, Al 2 o 3 Ceramic slurry 20%, adhesive 3%, dispersant 0.2%, gelling agent 0.2%, plasticizer 0.05%, antiaging agent 0.05%, crosslinking agent 0.05%, thickener 0.1%, photoinitiator 0.3%, the balance is deioniz...

Embodiment 2

[0063] A 12μm wet-process PE separator and a 6um PET non-woven fabric are selected, and the wet-process PE separator and PET non-woven fabric are combined with PVDF coating slurry to form a composite lithium-ion battery separator with a structure of PE separator-PVDF coating-PET non-woven fabric . The thickness of the PVDF coating is 2 μm, and the thickness of the prepared composite lithium-ion battery separator is 20 μm.

[0064] The high temperature-resistant multi-layer diaphragm composite lithium-ion battery diaphragm of the present invention can be prepared by a traditional process, and a more optimal choice is to prepare it by the method of the present invention as follows:

[0065] A. Preparation of coating slurry: Take the following raw materials according to mass percentage, PVDF slurry 25%, adhesive 4%, dispersant 0.3%, gelling agent 0.3%, plasticizer 0.1%, anti-aging agent 0.08 %, 0.1% of crosslinking agent, 0.2% of thickener, 0.5% of photoinitiator, and deionized ...

Embodiment 3

[0071] A 9μm wet-process PE diaphragm and a 6um PMIA (meta-aromatic polyamide) diaphragm are selected, and the wet-process PE diaphragm and PMIA diaphragm are compounded with PTFE (polytetrafluoroethylene) coating slurry to form a PE diaphragm-PTFE coating - Composite Li-ion battery separator with PMIA separator. The thickness of the PTFE coating is 3 μm, and the thickness of the prepared composite lithium-ion battery separator is 18 μm.

[0072] The high temperature-resistant multi-layer diaphragm composite lithium-ion battery diaphragm of the present invention can be prepared by a traditional process, and a more optimal choice is to prepare it by the method of the present invention as follows:

[0073] A. Preparation of coating slurry: Take the following raw materials according to mass percentage, PTFE slurry 30%, adhesive 5%, dispersant 0.4%, gelling agent 0.5%, plasticizer 0.08%, anti-aging agent 0.1 %, 0.07% of crosslinking agent, 0.3% of thickener, 0.7% of photoinitiato...

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Abstract

The invention relates to a high-temperature resistant multi-layer separator composite lithium ion battery separator, and belongs to the technical field of a battery separator. The high-temperature resistant multi-layer separator composite lithium ion battery separator comprises the battery separator, the composite lithium ion battery separator is of a lamination structure comprising at least two layers of battery separators, adjacent battery separator layers are pasted and fixed by coating paste, and the coating paste comprises based on weight by mass: 20-40% of coating layer paste, 3-6% of adhesive, 0.2-0.5% of dispersing agent, 0.2-0.5% of gelatinzing agent, 0.05-0.2% of plasticizer, 0.05-0.2% of aging resistant agent, 0.05-0.2% of cross-linking agent, 0.1-0.5% of thickening agent and 0.3-1% of photoinitiator with the balancing being deionized water. The invention provides a preparation method of the high-temperature resistant multi-layer separator composite lithium ion battery separator. The battery separator has relatively high safety of the coating layer separator on a current and can also be resistant to high temperature, the shrinkage rate of the separator under a high-temperature condition is reduced, and the integral lifetime of the battery is prolonged; and moreover, the affinity of the separator and an electrolyte can be improved, the separator can be fully swelled by the electrolyte, and the cycle lifetime of the battery is favorably prolonged.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragms, and relates to a composite lithium ion battery diaphragm, in particular to a high temperature resistant multilayer diaphragm composite lithium ion battery diaphragm and a preparation method thereof. The composite lithium ion battery diaphragm of the present invention has good heat shrinkage resistance and safety High thermal stability, long service life of the diaphragm; the preparation method of the invention is simple and easy to operate, and the prepared composite lithium-ion battery diaphragm has good mechanical properties. Background technique [0002] Lithium batteries have the advantages of high specific energy, small size, light weight, less self-discharge, long cycle life, and no pollution. They have been used more and more widely. The market extends to mobile phones, laptop computers, digital cameras, power tools, Electric bicycles, electric motorcycles, electric vehicles, en...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/449H01M50/451H01M50/457H01M50/489H01M50/491
CPCH01M50/44H01M50/403H01M50/451H01M50/491Y02E60/10
Inventor 徐锋袁海朝邓云飞马文献田海龙
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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