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A kind of preparation technology of composite polymer diaphragm for lithium battery

A composite polymer and preparation process technology, which is applied in the field of preparation of composite polymer separators for lithium batteries, can solve the problems of uneven pore size distribution on the surface of composite membranes, high temperature melting damage, battery performance effects, etc. Uniform distribution of high temperature and strength, the effect of improving high temperature resistance and strength

Active Publication Date: 2021-02-19
温州强润新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a preparation process for a composite polymer diaphragm for lithium batteries, the polymer diaphragm is based on the prepared high-strength super-hydrophilic polyurethane, and the nano-ceramic powder is fixed on the surface of the polyurethane film by chemical cross-linking , not only has strong binding ability, it will not be separated under the action of external force and high temperature, and at the same time, compared with the ceramic powder fixed directly by bonding, the ceramic powder fixed by chemical crosslinking is evenly distributed, because the ceramic powder has higher strength and High temperature resistance, by fixing a layer of ceramic powder on both surfaces of the composite membrane, the high temperature resistance and strength of the prepared composite membrane can be improved, and the high temperature resistance and strength distribution of the composite membrane are evenly distributed due to the uniform distribution of the sleeve powder, preventing traditional technology When bonding and fixing directly through the adhesive, the distribution of the ceramic powder is uneven, resulting in uneven high temperature resistance and strength in different positions of the prepared composite membrane, and the blocking positions of the micropores on the surface of the composite membrane are different, so that the pore size of the surface of the composite membrane Uneven distribution, which in turn has a certain impact on the performance of the battery, solves the problem of uneven coating or dispersion caused by coating inorganic materials directly on the separator through the coating method in the prior art, thereby reducing the performance of different positions of the prepared separator , which in turn causes the diaphragm to be prone to high-temperature melting damage or external force tearing damage at different positions in harsh environments

Method used

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  • A kind of preparation technology of composite polymer diaphragm for lithium battery
  • A kind of preparation technology of composite polymer diaphragm for lithium battery
  • A kind of preparation technology of composite polymer diaphragm for lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The specific preparation process of high-strength super-hydrophilic polyurethane is as follows:

[0031] ① Weigh 1kg of 1,5-naphthalene disulfonate and dissolve it in 7L of water. When the temperature rises to 80°C, add 2.9kg of thionyl chloride to it, and after reflux reaction for 5 hours, keep the water phase after liquid separation, and carry out the water phase Evaporated and crystallized to obtain 1,5-naphthalene disulfonyl chloride;

[0032] ②Weigh 1 kg of glutamic acid and dissolve it in 15L of dilute hydrochloric acid with a mass fraction of 1% to form a glutamic acid solution, add the prepared glutamic acid solution into the reaction vessel, raise the temperature to 70°C, and simultaneously add 0.73 kg of 1,5-naphthalene disulfonyl chloride prepared in step ①, reacted at constant temperature for 3 hours, then evaporated and crystallized, and at the same time washed the crystal with acetone solution, and then dried to obtain a cross-linked dicarboxylic polymer m...

Embodiment 2

[0036] The specific preparation process of high-strength super-hydrophilic polyurethane is as follows:

[0037] ① Weigh 1 kg of 1,5-naphthalene disulfonate and dissolve it in 8 L of water. When the temperature rises to 80 ° C, add 3 kg of thionyl chloride to it, and after reflux reaction for 5 hours, keep the water phase after liquid separation, and evaporate the water phase Crystallization to obtain 1,5-naphthalene disulfonyl chloride;

[0038] ②Weigh 1 kg of glutamic acid and dissolve it in 15L of dilute hydrochloric acid with a mass fraction of 1% to form a glutamic acid solution, add the prepared glutamic acid solution into the reaction vessel, raise the temperature to 70°C, and simultaneously add 0.75 kg of 1,5-naphthalene disulfonyl chloride prepared in step ①, reacted at constant temperature for 3 hours, then evaporated and crystallized, and at the same time washed the crystal with acetone solution, and then dried to obtain the cross-linked dicarboxylic polymer monomer;...

Embodiment 3

[0042] A preparation process for a composite polymer diaphragm for a lithium battery, comprising the following preparation process:

[0043] In the first step, the high-strength super-hydrophilic polyurethane prepared in Example 1 is added to the extruder and extruded after being melted at 150°C, then stretched to make it a parallel-arranged lamellar crystal structure, and then heat-treated and again Stretching separates the sheets to form narrow and long micropores, and finally heat-setting to obtain high-strength microporous polyurethane membranes;

[0044] In the second step, 0.215 kg of the surface aminated nano-ceramic powder prepared in Example 1 was dissolved in 1.505 L of water, and the ultrasonic dispersion was uniform, and then 100 g of the high-strength microporous polyurethane membrane prepared in the first step was soaked in water, and ultrasonically oscillated 30min, then drop 0.136kg of hexamethylene diisocyanate into it, and ultrasonicate while dropping, after ...

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Abstract

The invention discloses a preparation process of a composite polymer diaphragm for a lithium battery, comprising the following preparation process: adding the prepared high-strength super-hydrophilic polyurethane into an extruder, extruding after melting at 150°C, and then stretching to make It becomes a flaky crystal structure arranged in parallel, and then the sheets are separated by heat treatment and re-stretching to form micropores, and finally heat-set to obtain a high-strength microporous polyurethane film; the prepared surface aminated nano-ceramic powder is dissolved in water, then soak the prepared high-strength microporous polyurethane membrane in water, ultrasonically vibrate for 30 minutes, then add hexamethylene diisocyanate dropwise therein, react for 2 hours, take it out, wash with ethanol, and dry to obtain a composite polymer membrane. The nano-ceramic powder on the surface of the composite membrane prepared by the present invention is evenly dispersed, so that the composite membrane has uniform voids, uniform mechanical properties and high temperature resistance, and the prepared composite membrane has high wettability, which can ensure the passage of the electrolyte .

Description

technical field [0001] The invention belongs to the field of lithium battery diaphragm preparation, and relates to a preparation process of a composite polymer diaphragm for lithium batteries. Background technique [0002] As one of the important components of the lithium battery, the diaphragm can allow lithium ions to pass through while blocking the positive and negative electrodes to prevent short circuit. At the same time, the liquid absorption performance of the diaphragm affects the absorption of the electrolyte. Since the diaphragm acts as an ion channel, the passage of the electrolyte must be guaranteed. , At the same time, the mechanical properties and high temperature resistance of the diaphragm determine whether the diaphragm will be damaged in a harsh environment, and the damage of the diaphragm will easily cause a short circuit of the lithium battery. [0003] In the process of preparing the diaphragm in the prior art, dipping or coating is usually used to coat ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12C08J5/18C08L75/04H01M10/0525H01M50/403H01M50/414
CPCH01M10/0525C08J5/18C08J7/12C08J2375/04H01M50/403H01M50/411Y02E60/10
Inventor 不公告发明人
Owner 温州强润新材料科技有限公司
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