Modified composite heat-resistant lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery, modified technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of large static electricity, high moisture, insufficient heat resistance, etc., to reduce surface energy, enhance compatibility and Dispersibility, the effect of improving the overall heat resistance

Inactive Publication Date: 2021-01-12
长园泽晖新能源材料研究院(珠海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to solve the problems of insufficient heat resis

Method used

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  • Modified composite heat-resistant lithium ion battery diaphragm and preparation method thereof
  • Modified composite heat-resistant lithium ion battery diaphragm and preparation method thereof
  • Modified composite heat-resistant lithium ion battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A preparation method of a modified composite heat-resistant lithium-ion battery diaphragm, comprising the steps of:

[0052] A. Modification of aramid fiber: select meta-aramid fiber, the structure is as follows figure 1 As shown in a, add a sodium hydroxide solution with a mass concentration of 4.5% to treat for 60 minutes at 60°C, carry out chemical modification, partially hydrolyze the meta-aramid fiber, open part of the polymer chain segment, and then add terephthalic acid to remove Excessive alkali, take a sample and monitor the pH of the solution with a pH meter, adjust the pH to a weak acid environment of 4.5, and finally cool down to 3°C and add p-phenylenediamine solution, add it while stirring rapidly, and carry out chemical copolymerization modification. After completion, use the above The sodium hydroxide solution adjusts the pH to 7.0 to obtain a modified aramid fiber slurry with a structure such as figure 2 shown.

[0053] B. Modification of inorganic n...

Embodiment 2

[0057] A preparation method of a modified composite heat-resistant lithium-ion battery diaphragm, comprising the steps of:

[0058] A. Modification of aramid fiber: select meta-aramid fiber, the structure is as follows figure 1As shown in a, add 0.1% sodium hydroxide solution at 30°C for 120 minutes to carry out chemical modification to partially hydrolyze the meta-aramid fiber, open part of the polymer chain segment, and then add terephthalic acid to remove For excess alkali, take a sample and monitor the pH of the solution with a pH meter, adjust the pH to a weak acid environment of 4.2, and finally cool down to 5°C and add p-phenylenediamine solution, add it while stirring rapidly, and carry out chemical copolymerization modification. After completion, use the above The sodium hydroxide solution adjusts the pH to 6.8 to obtain a modified aramid fiber slurry with a structure such as figure 2 shown.

[0059] B. Modification of inorganic nano-materials: Select spherical bau...

Embodiment 3

[0063] A preparation method of a modified composite heat-resistant lithium-ion battery diaphragm, comprising the steps of:

[0064] A. Modification of aramid fiber: select meta-aramid fiber, the structure is as follows figure 1 As shown in a, first add 10% sodium hydroxide solution at 100°C for 10 minutes to carry out chemical modification to partially hydrolyze the meta-aramid fiber, open part of the polymer chain segment, and then add terephthalic acid to remove Excessive alkali, take a sample and monitor the pH of the solution with a pH meter, adjust the pH to a weak acid environment of 4.8, and finally cool down to 0°C and add p-phenylenediamine solution, add it while stirring rapidly, and carry out chemical copolymerization modification. After completion, use the above The sodium hydroxide solution adjusts the pH to 6.0 to obtain a modified aramid fiber slurry with a structure such as figure 2 shown.

[0065] B. Modification of inorganic nanomaterials: select spherical...

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Abstract

The invention belongs to the field of high polymer materials, and discloses a preparation method of a modified composite heat-resistant lithium ion battery diaphragm, which comprises the following steps: A, modifying aramid fibers; B, modifying an inorganic nano material; C, mixing the modified aramid fiber slurry and the modified inorganic nano slurry with a solvent in proportion to prepare organic-inorganic mixed modified slurry; and D, coating a base membrane with the organic-inorganic mixed modified slurry, and carrying out moisture solidification, washing, solvent removal and drying to obtain the modified composite heat-resistant lithium ion battery diaphragm. The problems of insufficient heat resistance, high moisture, large static electricity and the like of an existing aramid fibercoating diaphragm are solved.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a modified composite heat-resistant lithium-ion battery diaphragm and a preparation method thereof. Background technique [0002] As a new type of special polymer material, aramid fibers are currently commercially produced mainly meta-aramid (PMIA, aramid 1313), para-aramid (PPTA, aramid 1414), and copolymerized Modified aramid. The molecular structure of meta-aramid fiber is as follows figure 1 As shown in -a, the amide bond is connected at the 1st and 3rd positions of the two benzene rings. Meta-aramid has excellent heat resistance, flame resistance, insulation, and textile processing performance. It is mainly used for fire prevention, electrical insulation, personal protection, and high-temperature filtration, dust removal, and flue gas treatment in chemical production. Multi-component copolymerized aramid fibers also have excellent heat resistance, dimensional stability, a...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/451H01M10/0525C08G69/48C09D177/10C09D7/62C09D7/63C09D7/65B82Y40/00
CPCB82Y40/00C08G69/48C08K2003/2227C08K2201/011C08L2205/025C08L2205/035C09D177/10C09D7/62C09D7/63C09D7/65H01M10/0525C08L71/02C08K9/06C08K3/36C08K5/053C08K3/22C08K5/06C08L79/08C08K3/40Y02E60/10
Inventor 黄贵忠刘方刘谨豪
Owner 长园泽晖新能源材料研究院(珠海)有限公司
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