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Polyacrylate film for lithium battery diaphragm

A technology of polyacrylate and thin film, which can be applied to secondary batteries, battery components, circuits, etc., and can solve problems such as undetermined practical methods

Inactive Publication Date: 2018-12-07
LIONANO ZHEJIANG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practical methods to effectively control the molecular weight of these polymers during synthesis have not been identified

Method used

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  • Polyacrylate film for lithium battery diaphragm
  • Polyacrylate film for lithium battery diaphragm
  • Polyacrylate film for lithium battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0092] In this example, lithium acrylate was obtained by neutralization between a strong inorganic base and a weak organic acid. Dissolve 2 g of acrylic acid in 100 mL of distilled water. 0.63 g (0.95 molar ratio to acrylic acid) of LiOH was added to the solution. The solution was cooled in an ice bath and the reaction mixture was stirred for 5 minutes. Water was removed by rotary evaporation at 30°C for 45 minutes.

example 2

[0094] 50 g of the synthesized crude product was dissolved in 25 mL of deionized water to obtain a translucent solution. The solution must be filtered through a 0.2 micron syringe before adding 100 mL of acetone. After 2 hours, the organic salt precipitated as a fine white powder, which was collected for use in the next step.

example 3

[0096] Lithium acrylate (1g), 4,4-azobis(4-cyanovaleric acid) (ACVA) (0.0577g) and MeOH / H 2 O (volume ratio 5 / 5, 11.5 mL) was mixed in a 20 mL bottle. The mixture was cycled through a freeze-thaw pump for five cycles of degassing. The reaction flask was sealed and stirred at 60°C for 6h. After the reaction, 10 mL of acetone was added to the reaction flask, stirred for 15 min, and lithium polyacrylate (PLA) was precipitated. Lithium polyacrylate was collected by vacuum filtration and washed with isopropanol. Then, the lithium polyacrylate was placed in a vacuum oven and dried at 50° C. for 48 hours.

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Abstract

The present invention generally relates to materials such as poly (lithium acrylate) (PLA), which are useful in polymer blend films and other applications. For example, certain embodiments are directed to methods of making lithium polyacrylate or preparing a film comprising lithium polyacrylate. In some embodiments, the lithium acrylate monomer can be obtained by a neutralization reaction betweena strong inorganic base and a weak organic acid. Such materials can be used as membranes in electrochemical cells, for example, in batteries such as lithium ion batteries, or other applications. In some cases, the molecular weight of the PLA may range from 102 Da to 106 Da. In certain embodiments, the film has a mechanical strength with an elastic stress modulus between 5 kPa and 500 MPa, and an elongation between 0% and 200%. In some embodiments, the film may have an ionic conductivity between 10 and 9S cm<-1> to 10<-3>Scm<-1>.

Description

technical field [0001] The present invention generally relates to lithium polyacrylate (PLA) and other materials that can be used in polymer films and other applications. For example, the material can be used in electrochemical cells, such as as a thin film in batteries such as lithium-ion batteries, or in other applications. Background technique [0002] The development of energy-dense and safe lithium-ion batteries (LIBS) with high energy density is of great significance to address energy and environmental challenges such as vehicle electrification and grid-scale energy storage. Most state-of-the-art Li-ion battery configurations contain organic liquid electrolytes that facilitate the movement of ions through the liquid's high ionic conductivity and provide the system with a relatively high voltage rating; however, the flammability of organic liquid electrolytes pose a safety hazard, especially in large or energy-intensive systems. Furthermore, the energy density of stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/42H01M50/494H01M50/497
CPCH01M10/0525H01M10/0565C08F120/06H01M10/4235C07C51/412C08J5/18H01M2300/0082C08J2333/02C08K2003/387C08K3/16C08K5/098C08J2471/02C08J2479/02C08J2433/26C08J2439/06C08J2429/04C08J2433/08H01M50/497H01M50/42H01M50/494C07C57/04H01M2300/0085Y02E60/10
Inventor 黃沛屾方艳任东李明慧沈赟于英超
Owner LIONANO ZHEJIANG INC
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