Preparation method of polyetheretherketone-based lithium battery separator

Abstract

The invention belongs to the field of a polyetheretherketone polymer material, and particularly discloses a preparation method of a polyetheretherketone-based lithium battery separator. The preparation method comprises the following steps of (1) chlorosulfonated fluorine monomer synthesis; (2) sulfonated polyetheretherketone synthesis; (3) solution mixing; (4) film formation and drying; and (5) hole formation and drying. The polyetheretherketone-based lithium battery separator prepared by the method has the following performance of electron insulativity, electrolyte corrosion resistance, enough chemical and electrochemical stability and relatively good dynamic property, and mechanical isolation of a positive electrode and a negative electrode is ensured.

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. [...

Examples

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...

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. [...

Examples

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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