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A preparation method of polyetheretherketone-based lithium battery diaphragm

A polyether ether ketone and battery separator technology, which is applied in lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problems of technological lag in the development and improvement of diaphragm materials, difficult protection, poor mechanical strength, etc. Achieve good thermal stability and automatic shutdown protection performance, good spatial stability and flatness, and good molding shrinkage

Active Publication Date: 2021-07-16
YIBIN TIANYUAN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of existing lithium-ion battery separators are: 1. Due to the improvement of lithium battery precursor materials, the development and improvement technology of separator materials is relatively lagging behind; 3. The mechanical strength is poor. The tensile strength of lithium-ion battery separators is generally between 22 and 25MPa. 4. In the case of over-temperature or short-circuit, the situation will deteriorate rapidly, and it is difficult to prevent the short-circuit of the battery. protection in case of

Method used

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  • A preparation method of polyetheretherketone-based lithium battery diaphragm
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  • A preparation method of polyetheretherketone-based lithium battery diaphragm

Examples

Experimental program
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Embodiment 1

[0037] 1. Synthesis of chlorosulfonated fluoroketone monomer

[0038] Put 4,4,-difluorobenzophenone (20 parts), methanesulfonyl chloride (25 parts), and chlorosulfonic acid (55 parts) into a three-neck flask equipped with stirring, a thermometer, and a condensing reflux device. Stir continuously under low temperature for 60 min; the system is heated up to 55°C and continue to stir for 120 min. After the reaction is complete, the reaction product is filtered and washed with deionized water to obtain chlorosulfonated fluoroketone crystals;

[0039] 2. Synthesis of sulfonated polyetheretherketone

[0040] In a three-necked flask equipped with a stirrer, a thermometer, and a condensing reflux device, add the chlorosulfonated monomer (5 parts), hydroquinone (5 parts), sodium carbonate (5 parts), sulfolane (85 parts), react under the continuous protection of high-purity nitrogen, raise the temperature to 120°C, and keep the temperature constant for 30 minutes; 300min; Finally, pou...

Embodiment 2

[0048] 1. Synthesis of chlorosulfonated fluoroketone monomer

[0049] Put 4,4,-difluorobenzophenone (25 parts), methanesulfonyl chloride (25 parts), and chlorosulfonic acid (50 parts) into a three-necked flask equipped with stirring, a thermometer, and a condensing reflux device. Stir continuously under low temperature for 60 min; the system is heated up to 55°C and continue to stir for 120 min. After the reaction is complete, the reaction product is filtered and washed with deionized water to obtain chlorosulfonated fluoroketone crystals;

[0050] 2. Synthesis of sulfonated polyetheretherketone

[0051] In a three-necked flask equipped with a stirrer, a thermometer, and a reflux condenser, add the chlorosulfonated monomer (10 parts), hydroquinone (10 parts), sodium carbonate (10 parts), sulfolane (70 parts), react under the continuous protection of high-purity nitrogen, raise the temperature to 120°C, and keep the temperature constant for 30 minutes; 300min; Finally, pour t...

Embodiment 3

[0059] 1. Synthesis of chlorosulfonated fluoroketone monomer

[0060] Put 4,4,-difluorobenzophenone (30 parts), methanesulfonyl chloride (25 parts), and chlorosulfonic acid (45 parts) into a three-neck flask equipped with stirring, a thermometer, and a condensing reflux device. Stir continuously under low temperature for 60 min; the system is heated up to 55°C and continue to stir for 120 min. After the reaction is complete, the reaction product is filtered and washed with deionized water to obtain chlorosulfonated fluoroketone crystals;

[0061] 2. Synthesis of sulfonated polyetheretherketone

[0062] In a three-necked flask equipped with a stirrer, a thermometer, and a reflux condenser, add the chlorosulfonated monomer (15 parts), hydroquinone (15 parts), sodium carbonate (10 parts), sulfolane (60 parts), react under the continuous protection of high-purity nitrogen, raise the temperature to 120°C, and keep the temperature constant for 30 minutes; 300min; Finally, pour the...

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Abstract

The invention belongs to the field of polyetheretherketone macromolecule materials, and specifically discloses a preparation method of a polyetheretherketone-based lithium battery diaphragm, which comprises the following steps: (1) synthesizing chlorosulfonated fluoroketone monomers, (2) sulfonating polyetheretherketone Synthesis of ether ether ketone, (3) solution mixing, (4) film formation and drying, (5) pore formation and drying. The polyetheretherketone-based lithium battery diaphragm prepared by the method of the present invention has the following properties: it has electronic insulation and ensures the mechanical isolation of the positive and negative electrodes; it is resistant to electrolyte corrosion and has sufficient chemical and electrochemical stability; it has good mechanical properties.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of a polyetheretherketone-based lithium battery diaphragm. Background technique [0002] China's lithium battery industry is in the ascendant. Encouraged by the 12th Five-Year Plan, the expansion of existing production capacity and the development of potential production capacity have doubled year by year between 2011 and 2013. As the most profitable separator in the inner layer components of lithium-ion batteries It is the first to develop. In just a few years, more than 40 manufacturers have emerged in China, with a total of more than 200 production lines. The development of lithium battery diaphragm technology is advancing with the changes in the application of lithium-ion batteries. At present, the prominent feature is the development trend of lithium batteries getting bigger and smaller and lithium batteries getting smaller and smaller. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/414H01M50/489H01M50/491H01M50/494H01M50/497H01M10/052H01M50/411H01M50/417
CPCH01M10/052H01M50/403H01M50/411Y02E60/10
Inventor 侯天武颜华佘国华
Owner YIBIN TIANYUAN GRP CO LTD
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