Thermal buffer fiber modified diaphragm for lithium battery and preparation method

A fiber modification and thermal buffering technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as low production efficiency, unsatisfactory modification effect, and poor heat resistance.

Inactive Publication Date: 2021-04-27
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, the widely used lithium battery polyolefin separator has the problems of poor heat resistance and poor mechanical properties, while the process of adding and modifying inorganic heat-resistant materials is cumbersome, the production efficiency is low, and the modification effect is not ideal.

Method used

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  • Thermal buffer fiber modified diaphragm for lithium battery and preparation method
  • Thermal buffer fiber modified diaphragm for lithium battery and preparation method
  • Thermal buffer fiber modified diaphragm for lithium battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037](1) First add urea into a formaldehyde solution with a mass concentration of 37% to fully dissolve, 10 parts by weight of urea and 20 parts by weight of formaldehyde solution; then use triethanolamine to adjust the pH value to 9, then heat the reaction in a water bath, and the temperature of the water bath is 80°C , the reaction time is 1h; then let it stand and cool to room temperature naturally, and finally adjust the pH value to neutral to obtain a urea-formaldehyde resin prepolymer solution;

[0038] (2) First mix the urea-formaldehyde resin prepolymer solution prepared in step (1) with sepiolite powder and polyethylene glycol with a molecular weight of 10000, 90 parts by weight of urea-formaldehyde resin prepolymer solution, 5 parts by weight of sepiolite powder 10 parts of polyethylene glycol with a molecular weight of 10000; then disperse for 40 minutes in an ultrasonic machine with a frequency of 50 kHz to obtain a spinning solution;

[0039] (3) The spinning sol...

Embodiment 2

[0042] (1) First add urea into a formaldehyde solution with a mass concentration of 37% to fully dissolve, 15 parts by weight of urea and 30 parts by weight of formaldehyde solution; then use triethanolamine to adjust the pH value to 9, then heat the reaction in a water bath, and the temperature of the water bath is 80°C , the reaction time is 1h; then let it stand and cool to room temperature naturally, and finally adjust the pH value to neutral to obtain a urea-formaldehyde resin prepolymer solution;

[0043] (2) First mix the urea-formaldehyde resin prepolymer solution prepared in step (1) with sepiolite powder and polyethylene glycol with a molecular weight of 10000, 100 parts by weight of urea-formaldehyde resin prepolymer solution, and 8 parts by weight of sepiolite powder 15 parts of polyethylene glycol with a molecular weight of 10000; then disperse for 30 minutes in an ultrasonic machine with a frequency of 50 kHz to obtain a spinning solution;

[0044] (3) The spinni...

Embodiment 3

[0047] (1) First add urea into a formaldehyde solution with a mass concentration of 37% to fully dissolve, 15 parts by weight of urea and 30 parts by weight of formaldehyde solution; then use triethanolamine to adjust the pH value to 9, then heat the reaction in a water bath, and the temperature of the water bath is 80°C , the reaction time is 2h; then stand and cool to room temperature naturally, and finally adjust the pH value to neutral to obtain a urea-formaldehyde resin prepolymer solution;

[0048] (2) First mix the urea-formaldehyde resin prepolymer solution prepared in step (1) with sepiolite powder and polyethylene glycol with a molecular weight of 10000, 110 parts by weight of urea-formaldehyde resin prepolymer solution, 10 parts by weight of sepiolite powder 15 parts of polyethylene glycol with a molecular weight of 10000; then disperse for 40 minutes in an ultrasonic machine with a frequency of 50 kHz to obtain a spinning solution;

[0049] (3) The spinning solutio...

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Abstract

The invention relates to the field of lithium battery diaphragms, and discloses a thermal buffer fiber modified diaphragm for a lithium battery and a preparation method. Urea and formaldehyde are used for preparing a urea-formaldehyde prepolymer, sepiolite powder and polyethylene glycol with a molecular weight of 10000 are dispersed in the prepolymer, fibers are obtained through spinning and dispersed in a polyolefin film through rolling, the polyolefin film is enhanced, the urea-formaldehyde fibers are good in heat resistance, and meanwhile, the polyethylene glycol with a molecular weight of 10000 is used as a phase change material and absorbs heat at 80-100 DEG C so as to buffer heat and to prevent thermal deformation of the polyolefin film. The method provided by the invention can effectively improve the mechanical strength and heat resistance of the diaphragm, and can be compatible with the existing process to form assembly line production.

Description

technical field [0001] The invention relates to the field of lithium battery separators, and discloses a thermal buffer fiber modified separator for lithium batteries and a preparation method thereof. Background technique [0002] Lithium batteries have many advantages such as large specific energy, long cycle life, and no environmental pollution. They are widely used in fields such as electric vehicles, hybrid vehicles, and energy storage batteries. Lithium batteries are mainly composed of four parts: positive and negative electrode materials, electrolyte, diaphragm and battery case. Among them, the separator, as one of the key components of the lithium battery, plays the role of preventing the short circuit of the positive and negative contacts and providing lithium ion transmission channels. The performance of the separator directly affects the electrochemical performance and safety performance of the lithium battery, so higher requirements are put forward for the perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/44H01M50/414H01M50/434H01M50/446H01M50/417
CPCY02E60/10
Inventor 廖健淞陈庆司文彬李钧
Owner CHENDU NEW KELI CHEM SCI CO LTD
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