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Graphene oxide-modified polyurethane-cellulose battery separator and preparation method thereof

A lithium battery diaphragm and cellulose technology, which is applied in the field of graphene oxide modified polyurethane-cellulose lithium battery diaphragm and its preparation, can solve the problems of poor mechanical properties, high moisture permeability and limited application of cellulose film, and achieve convenient operation , comprehensive performance improvement, and easy-to-obtain effect

Inactive Publication Date: 2018-08-17
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the structure of cellulose itself, the cellulose film has problems such as poor mechanical properties, high moisture permeability, and easy combustion in case of fire, which greatly limits its application in life, industry and other fields. Therefore, it is necessary to add a modifier Improved performance of cellulose separators

Method used

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  • Graphene oxide-modified polyurethane-cellulose battery separator and preparation method thereof
  • Graphene oxide-modified polyurethane-cellulose battery separator and preparation method thereof
  • Graphene oxide-modified polyurethane-cellulose battery separator and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] Add 2.5g of fully dry cellulose into 40g of [Amim]Cl solution, stir in a 75°C water bath until completely dissolved. Under the protection of nitrogen, 0.6 g of 6-methylene diisocyanate was added to the cellulose casting solution and mixed evenly, and 0.03 g of dibutyltin dilaurate was added to react for 1.5 h. 0.02 g of graphene oxide was uniformly dispersed in 10 g of DMF solution by ultrasonic treatment for 25 min, and then the prepared graphene oxide suspension was added to the polyurethane-cellulose casting solution and mixed evenly. The mixed casting solution was left to defoam and then poured onto a clean glass plate, and scraped quickly with a scraper to form a film with a uniform thickness of 30 μm. The glass plate was immersed in distilled water to elute the solvent, and then the wet composite cellulose membrane was taken out, and the composite cellulose membrane was obtained after natural air drying.

Embodiment 2

[0030] Add 2.5g of fully dry cellulose into 40g of [Amim]Cl solution and stir in a water bath at 85°C until completely dissolved. Under the protection of nitrogen, 0.7 g of 6-methylene diisocyanate was added to the cellulose casting solution and mixed evenly, and 0.025 g of dibutyltin dilaurate was added to react for 1 h. 0.01 g of graphene oxide was uniformly dispersed in 10 g of DMF solution by ultrasonic treatment for 20 min, and then the prepared graphene oxide suspension was added to the polyurethane-cellulose casting solution and mixed evenly. The mixed casting solution was left to defoam and then poured onto a clean glass plate, and scraped quickly with a scraper to form a film with a uniform thickness of 28 μm. The glass plate was immersed in distilled water to elute the solvent, and then the wet composite cellulose membrane was taken out, and dried at 40° C. for 24 hours to obtain the composite cellulose membrane.

Embodiment 3

[0032] Add 2g of fully dry cellulose to 35g of [Amim]Cl solution, stir in a 75°C water bath until completely dissolved. Under the protection of nitrogen, 0.5 g of 6-methylene diisocyanate was added to the cellulose casting solution and mixed evenly, and 0.03 g of dibutyltin dilaurate was added to react for 1 h. 0.02 g of graphene oxide was uniformly dispersed in 15 g of DMF solution by ultrasonic treatment for 20 min, and then the prepared graphene oxide suspension was added to the polyurethane-cellulose casting solution and mixed evenly. The mixed casting solution was left to defoam and then poured onto a clean glass plate, and scraped quickly with a scraper to form a film with a uniform thickness of 40 μm. The wet composite cellulose membrane was taken out after the glass plate was immersed in distilled water to elute the solvent, and dried at 60° C. for 24 hours to obtain the composite cellulose membrane.

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Abstract

The invention discloses a graphene oxide-modified polyurethane-cellulose battery separator and a preparation method thereof, and belongs to the field of a lithium battery material. The composite cellulose separator is a wet-state graphene oxide-modified polyurethane-cellulose film material which is prepared by dissolving cellulose in an ionic liquid [Amin]Cl, performing crosslinking reaction with6-methylene diisocyanate and then mixing with graphene oxide, the separator is prepared by solvent replacement and drying, and the composite separator can be used for a non-aqueous lithium battery separator material. The separator prepared by the method has relatively good thermal resistance, chemical solvent resistance and mechanical property; and moreover, the regenerative cellulose is used as araw material, and the separator has the advantages of low cost and biological degradability.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a graphene oxide modified polyurethane-cellulose lithium battery diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of green secondary battery successfully developed in the 1990s. In recent years, with the rise of new energy and electric vehicle emerging industries, the industry has placed high hopes on the development and performance improvement of power batteries. Lithium batteries are mainly composed of four parts: positive electrode material, negative electrode material, electrolyte and separator. As a high-value-added material with the highest technical barriers among battery materials, the separator plays the role of electronic insulation between the positive and negative electrodes and provides microporous channels for lithium ion migration. The performance of the diaphragm directly affects the cycle life, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/44H01M50/446H01M50/489
CPCH01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 蒲俊文王澌洁李丹吴忠旋张琴琴
Owner BEIJING FORESTRY UNIVERSITY
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