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Novel nano-crystalline cellulose modified lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery and nano-cellulose technology, which is applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as low liquid absorption rate and liquid retention rate, poor electrolyte affinity, and battery safety hazards. Achieve the effects of less air bubbles, reduced defoaming time, and superior liquid absorption rate

Active Publication Date: 2016-06-29
BEIJING INSTITUTE OF TECHNOLOGYGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyethylene and polypropylene separators have poor affinity for electrolytes, and have deficiencies such as low liquid absorption rate and liquid retention rate, and the electrolyte is prone to side leakage, which poses a hidden danger to the safety of the battery.

Method used

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  • Novel nano-crystalline cellulose modified lithium ion battery diaphragm and preparation method thereof
  • Novel nano-crystalline cellulose modified lithium ion battery diaphragm and preparation method thereof
  • Novel nano-crystalline cellulose modified lithium ion battery diaphragm and preparation method thereof

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with specific embodiments. The described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0034] (1) The polymer matrix is ​​polyvinyl alcohol with a molecular weight of 77000. Cellulose nanofiber-lithium accounts for 0.1-20 wt.% of the polymer matrix.

[0035] (2) The porous structure of the diaphragm is obtained by the phase separation method. Use a scraper to scrape the scraping liquid on a glass plate to form a film, then place it in ethanol at room temperature for a coagulation bath for 24 hours, then dry it at room temperature, and p...

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PUM

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Abstract

The invention discloses a novel nano-crystalline cellulose modified lithium ion battery diaphragm and a preparation method thereof, and aiming to provide a novel nano-crystalline cellulose modified lithium ion battery diaphragm which has relatively high hydrophily, liquid absorption rate, liquid retention rate, mechanical property and environmental friendliness and a preparation method thereof. The novel nano-crystalline cellulose modified lithium ion battery diaphragm comprises cellulose nanofiber-lithium and a polymer substrate and is prepared according to the steps of film scraping liquid configuration, defoaming, film scarping and coagulating bath. The cellulose nanofiber-lithium improved lithium ion battery diaphragm prepared according to the method is favorably maintained with a natural cellulose I crystal structure, a composite membrane is endowed with relatively high mechanical performance, and the hydrophily and the stability of the composite membrane are improved; and the method has the advantages of very high industrial production capability and wide application prospect.

Description

technical field [0001] The invention designs and prepares a lithium-ion battery diaphragm and a preparation method thereof, and in particular relates to a novel nanocellulose-improved lithium-ion battery diaphragm and a preparation method thereof. Background technique [0002] Cellulose is a renewable resource with abundant reserves in nature. Materials produced from cellulose have many excellent properties, such as high dielectric constant, strong puncture resistance, good chemical stability, good thermal stability, and degradable etc., and are widely used in papermaking, electronic products, industrial processing, medicine and other fields. In recent years, many membrane material researchers have devoted themselves to the development of low-cost, renewable cellulose raw materials to prepare high-performance separators, especially lithium-ion battery separators with cellulose, modified and reinforced cellulose as the main raw material, and Compared with polyolefin separato...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525H01M50/44
CPCH01M10/0525H01M50/44Y02E60/10
Inventor 邵自强刘川渟王振华卢丞一毕新德毕于东邱建军刘厚余
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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