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Modified PMMA, preparation method thereof and preparation method of high-specific capacity flame-retardant lithium battery membrane by using modified PMMA

A lithium battery diaphragm and high specific capacity technology, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of space waste and energy density reduction, and achieve the effect of low price, high strength, and easy-to-obtain materials

Pending Publication Date: 2019-12-20
XINXIANG ZHONGKE SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the thickness of commonly used battery separators is generally about 20 μm. After coating with ceramics, the thickness increases and the surface density increases even more, reaching about 20% of the thickness of the positive and negative electrodes. This also causes serious waste of space and reduces the energy density. Reduce the space occupied by the diaphragm. At present, lithium-ion battery manufacturers generally require thinner diaphragms. The thickness of these diaphragms can reach less than 16 μm, which ensures the lightness and thinness of the diaphragm and improves the original battery capacity. Performance is a challenge for diaphragms

Method used

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  • Modified PMMA, preparation method thereof and preparation method of high-specific capacity flame-retardant lithium battery membrane by using modified PMMA
  • Modified PMMA, preparation method thereof and preparation method of high-specific capacity flame-retardant lithium battery membrane by using modified PMMA
  • Modified PMMA, preparation method thereof and preparation method of high-specific capacity flame-retardant lithium battery membrane by using modified PMMA

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 3g of guanidine sulfamate and dissolve it in a mixed solvent of 100g of water and ethanol (water:ethanol=1:1), and dissolve evenly under mechanical stirring;

[0029] (2) Under N2 environment, transfer the above mixed solution to an ultrasonic bath, add 0.1% initiator AIBN, add 10g methyl methacrylate and heat to 65°C for 3.5 hours until the reaction solution is completely reacted to obtain sulfamic acid Guanidine modified PMMA mixture;

[0030] (3) Wash the modified PMMA mixture with water and alcohol, filter it with suction and dry it;

[0031] (4) The dried modified PMMA was dissolved and evenly coated on the PE separator, washed with water and then dried to obtain sample 1.

Embodiment 2

[0033] (1) Weigh 5g of guanidine phosphate and dissolve in 100g of water and acetone mixed solvent (water: acetone = 3:1), and dissolve evenly under mechanical stirring;

[0034] (2) Under the N2 environment, transfer the above mixed solution to an ultrasonic bath, add 0.1% initiator AIBN, add 20g methyl methacrylate and heat to 60°C for 3 hours until the reaction solution is completely reacted to obtain the modified guanidine phosphate Sexual PMMA mixture;

[0035] (3) Wash the modified PMMA mixture with water and alcohol, filter it with suction and dry it;

[0036] (4) The dried modified PMMA was dissolved and evenly coated on the PE separator, washed with water and then dried to obtain sample 2.

Embodiment 3

[0038] (1) Weigh 3g of guanidine sulfonate and dissolve it in 100g of water and methanol mixed solvent (water: methanol = 1:1), and dissolve evenly under mechanical stirring;

[0039](2) Under N2 environment, transfer the above mixed solution to an ultrasonic bath, add 0.1% initiator AIBN, then gradually add 20g of 3,3-methyl methacrylate and heat to 65°C for 3 hours until the reaction solution is completely reacted , obtain guanidine sulfonate modified PMMA mixed solution;

[0040] (3) Wash the modified PMMA mixture with water and alcohol, filter it with suction and dry it;

[0041] (4) The dried modified PMMA was dissolved and evenly coated on the PE separator, and the prepared modified PMMA mixture was coated on the PE separator, washed with water and then dried to obtain sample 3.

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Abstract

The invention belongs to the technical field of battery membranes, and particularly relates to modified PMMA, a preparation method thereof and a preparation method of a high-specific capacity flame-retardant lithium battery membrane by using the modified PMMA. Bonding crosslinking is performed on active groups in a guanidine salt and polar groups in a PMMA copolymer precursor through an initiatorAIBN so as to obtain the modified PMMA, and a coating on the high-specific capacity flame-retardant lithium battery membrane is formed through compound mixing of the modified PMMA and polysiloxane. The membrane has an organic-inorganic hybrid-structured coating, and therefore the membrane has high heat resistance, mechanical properties and flame retardancy.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragms, and in particular relates to a modified PMMA and a preparation method thereof, and a high specific energy flame-retardant lithium battery diaphragm prepared by using the modified PMMA and a preparation method thereof. Background technique [0002] The development of lithium-ion battery separators is constantly changing with the improvement of technological innovation and fierce competition at home and abroad. In terms of volume, the development of the diaphragm is developing in two directions: small and thick. Such as mobile phones, laptops and some portable digital devices. In order to meet the artistic trend and the demand for small and light weight, batteries generally need to be made very small, light in weight, and even have a certain degree of bending flexibility. At the same time, in order to obtain higher energy density, more electrodes need to be accommodated in a small batte...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08F120/14C08F8/34C08F8/40C09D133/12H01M2/14H01M2/16C08L23/06
CPCC08F8/34C08F8/40C08F120/14C08J2323/06C08J2433/12C09D133/12H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 郝福瑞李军超王向东荆正军杨绍萍殷桥波王超君张小雷杨丽灿孔祥海冯莹莹吴龙超
Owner XINXIANG ZHONGKE SCI&TECH
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