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Surface-modified lithium ion battery diaphragm with high ionic conductivity, ultralow moisture and high temperature resistance and preparation method of surface-modified lithium ion battery diaphragm

An ultrasonic and dispersant technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of battery bulging, affecting the moisture content of the battery pack, and scrapping, etc., to improve safety, improve battery safety, and improve durability. The effect of thermal properties

Pending Publication Date: 2022-03-04
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional PE or PP separators can no longer meet the needs of high-energy-density battery packs. Based on this, people have developed modified coated separators represented by alumina coatings, which improve the heat resistance of the separators. However, alumina The hydrophilicity will increase the moisture content of the diaphragm and affect the moisture content of the battery pack, resulting in safety hazards such as battery bulging and scrapping.

Method used

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  • Surface-modified lithium ion battery diaphragm with high ionic conductivity, ultralow moisture and high temperature resistance and preparation method of surface-modified lithium ion battery diaphragm
  • Surface-modified lithium ion battery diaphragm with high ionic conductivity, ultralow moisture and high temperature resistance and preparation method of surface-modified lithium ion battery diaphragm
  • Surface-modified lithium ion battery diaphragm with high ionic conductivity, ultralow moisture and high temperature resistance and preparation method of surface-modified lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method for coating slurry, comprising the following steps:

[0044] In the planetary stirring equipment, the dispersant, water, PTFE / CNTs nanocomposite material and amorphous LTO mixed powder were stirred at the speed of rotation 3100r / min and revolution 20r / min for 10min until uniform, and then at 50kHz ultrasonic frequency, Ultrasound for 3 minutes to obtain the mixed liquid, put it in a vacuum, high-speed dispersion, and planetary stirring equipment with ultrasonic oscillation function, stir at the rotation speed of 1000r / min, the revolution speed of 40r / min for 15min, and add the adhesive to the mixed liquid, at the same time Sonicate at an ultrasound frequency of 5 kHz. In parts by mass, the ratio of dispersant, water, PTFE / CNTs nanocomposite material, amorphous LTO mixed powder and adhesive is 0.2:74.8:5:20:5.

[0045] A method for preparing a lithium-ion battery diaphragm with high ion conductivity, ultra-low moisture, and high temperature resistan...

Embodiment 2

[0049] A preparation method for coating slurry, comprising the following steps:

[0050] In the planetary mixing equipment, the dispersant, water, PTFE / CNTs nanocomposite material and amorphous LTO mixed powder were stirred at a speed of 2000r / min for rotation and 30r / min for 15min until uniform, and then at an ultrasonic frequency of 30kHz, Ultrasound for 4 minutes to obtain the mixed liquid, put it in a vacuum, high-speed dispersion, and planetary stirring equipment with ultrasonic oscillation function, stir at the rotation speed of 2800r / min and the revolution speed of 30r / min for 20min, and add the adhesive to the mixed liquid, at the same time Sonicate at an ultrasound frequency of 6 kHz. In parts by mass, the ratio of dispersant, water, PTFE / CNTs nanocomposite material, amorphous LTO mixed powder and adhesive is 0.3:63.7:10:20:6.

[0051] A method for preparing a lithium-ion battery diaphragm with high ion conductivity, ultra-low moisture, and high temperature resistanc...

Embodiment 3

[0055] A preparation method for coating slurry, comprising the following steps:

[0056] In the planetary stirring equipment, the dispersant, water, PTFE / CNTs nanocomposite material and amorphous LTO mixed powder were stirred at the speed of rotation 1500r / min and revolution 50r / min for 20min until uniform, and then at 50kHz ultrasonic frequency, Ultrasound for 5 minutes to obtain the mixed liquid, put it in a vacuum, high-speed dispersion, and planetary stirring equipment with ultrasonic oscillation function, stir at the rotation speed of 3800r / min, the revolution speed of 20r / min for 25min, and add the adhesive to the mixed liquid, at the same time Sonicate at an ultrasound frequency of 8 kHz. In parts by mass, the ratio of dispersant, water, PTFE / CNTs nanocomposite material, amorphous LTO mixed powder and adhesive is 0.5:71.5:10:10:8.

[0057]A method for preparing a lithium-ion battery diaphragm with high ion conductivity, ultra-low moisture, and high temperature resistan...

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Abstract

The invention discloses a high-ionic-conductivity ultralow-moisture high-temperature-resistant surface-modified lithium ion battery diaphragm and a preparation method thereof.The lithium ion battery diaphragm is formed by coating of coating slurry, and the preparation method of the coating slurry comprises the following steps that firstly, a dispersing agent, water, a PTFE / CNTs nano composite material and amorphous LTO mixed powder are evenly mixed and subjected to ultrasonic treatment, and the surface-modified lithium ion battery diaphragm is obtained; according to the coating slurry, the amorphous LTO mixed powder and the PTFE / CNTs nano composite material are used for forming a mixed material, the amorphous LTO mixed powder and the PTFE / CNTs nano composite material are compounded to form brand-new slurry, the safety performance of the battery is improved, and meanwhile the cycle performance of the battery can be improved; meanwhile, the heat resistance of the lithium ion diaphragm can be effectively improved, the ionic conductivity is improved, and the moisture content of the diaphragm is reduced, so that the battery safety is improved, and the safety of an electric vehicle driven by a high-energy-density battery is further improved.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragms, and in particular relates to a lithium-ion battery diaphragm with high ion conductivity, ultra-low moisture and high temperature resistance surface modification and a preparation method thereof. Background technique [0002] As new energy vehicles are more and more accepted by the public, their safety performance has also attracted more and more attention. The safety and cycle performance of lithium batteries have become the focus of public attention, and the diaphragm is even more important in batteries. The absolute safety of the car and the shuttle for lithium ions. [0003] Traditional PE or PP separators can no longer meet the needs of high-energy-density battery packs. Based on this, people have developed modified coated separators represented by alumina coatings, which improve the heat resistance of the separators. However, alumina The hydrophilicity will increase the moisture ...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/449H01M50/446H01M10/0525
CPCH01M50/403H01M50/449H01M50/446H01M10/0525Y02E60/10
Inventor 袁海朝徐锋田海龙苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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