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Preparation method of high-temperature-resistant low-resistivity lithium ion battery diaphragm

A lithium-ion battery, low resistivity technology, used in secondary batteries, battery pack components, circuits, etc., to achieve the effect of improving low shrinkage, small thermal shrinkage, and uniform distribution

Inactive Publication Date: 2017-11-10
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

However, there is no relatively mature method for preparing the carbon nanotube modified coating separator in the prior art.

Method used

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  • Preparation method of high-temperature-resistant low-resistivity lithium ion battery diaphragm
  • Preparation method of high-temperature-resistant low-resistivity lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1), preparation of carbon nanotube modified ceramic slurry

[0027] Add deionized water and sodium polyacrylate to the planetary mixer, the sodium polyacrylate accounts for 0.3% of the total weight of the first-stage mixed slurry, then add ammonia water to adjust the pH value, adjust the pH value to between 7.5-8.5, and finally It is preferably 8, and then, stirring and ultrasonic vibration are carried out at the same time, the stirring speed is 1200r / min, and the stirring speed is continued for 15 minutes to form a primary mixed slurry; after long-term creative research and summary, the pH value of the dispersant is controlled at 7.5-8.5 The dispersion effect is good. By adding sodium orthophosphate, ammonia water or a mixture of the two to the dispersant and using it in conjunction with the dispersant, the pH value of the dispersant can be adjusted, and the dispersion effect is better and more stable. The tank of the planetary mixer is a multi-blade stirring paddle, ...

Embodiment 2

[0040] (1), preparation of carbon nanotube modified ceramic slurry

[0041] A. Add deionized water, sodium polymetaphosphate, and sodium lauryl sulfate to a planetary mixer equipped with a drop-in ultrasonic vibration plate. The dispersant accounts for 5% of the total weight of the first-stage mixed slurry, and then proceed simultaneously Stirring and ultrasonic vibration to form a primary mixed slurry;

[0042] B. Add ceramic powder with a median particle size of 0.8-1.0 μm to the primary mixing slurry, the proportion of ceramic powder is 20% of the total weight of the secondary mixing slurry, and then simultaneously stir and ultrasonically oscillate to form a secondary mixing slurry. Grade mixed slurry;

[0043] C. Add carbon nanotubes to the secondary mixed slurry in an amount of 2% of the weight of the secondary mixed slurry, and then simultaneously stir and ultrasonically vibrate to form a tertiary mixed slurry;

[0044] D, add water-based acrylic latex and sodium carbo...

Embodiment 3

[0049] (1), preparation of carbon nanotube modified ceramic slurry

[0050] A. Add deionized water, sodium silicate, sodium lauryl sulfate, and sodium polymetaphosphate to a planetary mixer equipped with a drop-in ultrasonic vibration plate, and the dispersant accounts for 1% of the total weight of the primary mixed slurry , followed by simultaneous stirring and ultrasonic vibration to form a primary mixed slurry;

[0051] B. Add ceramic powder with a median particle size of 0.7-0.9 μm to the primary mixing slurry, the proportion of ceramic powder is 40% of the total weight of the secondary mixing slurry, and then simultaneously stir and ultrasonically vibrate to form a secondary mixing slurry. Grade mixed slurry;

[0052] C. Add carbon nanotubes to the secondary mixed slurry in an amount of 1% of the weight of the secondary mixed slurry, then simultaneously stir and ultrasonically vibrate to form a tertiary mixed slurry;

[0053] D, add water-based acrylic latex and sodium ...

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Abstract

The invention relates to a preparation method of a high-temperature-resistant low-resistivity lithium ion battery diaphragm, and belongs to the technical field of battery diaphragms. A slurry layer is coated on one side end face or two side end faces of a basal membrane; then, after the slurry layer is dried, the high-temperature-resistant low-resistivity lithium ion battery diaphragm is obtained; the slurry layer is ceramic slurry or carbon nano tube modified ceramic slurry; and furthermore, the carbon nano tube modified ceramic slurry is at least coated on one side end face of the basal membrane. The invention further discloses a specific method for preparing the carbon nano tube modified ceramic slurry. By means of the preparation method in the invention, a steady and high-efficiency process is provided for producing the high-temperature-resistant low-resistivity lithium ion battery diaphragm; the prepared carbon nano tube modified ceramic slurry has low shrinkage ratio and high security of the ceramic slurry at high temperature, and also has high electric conductivity at normal temperature and low electric conductivity at high temperature of a carbon nano tube material; therefore, when the high-temperature-resistant low-resistivity lithium ion battery diaphragm is used in the field of electric automobiles, the charging time consumption problem of the electric automobiles can be solved; and the technical support is provided for development of clean energy automobiles.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragms, and relates to a lithium ion battery diaphragm, in particular to a preparation method of a high temperature resistant and low resistivity lithium ion battery diaphragm. The lithium ion battery diaphragm of the invention has good heat shrinkage resistance, high safety, good thermal stability and long service life of the diaphragm; the preparation method of the invention is simple and easy to operate, and the prepared lithium ion battery diaphragm has good mechanical properties. Background technique [0002] The basic role of the battery separator in a lithium battery is to separate the positive and negative electrodes, and to absorb the electrolyte to allow lithium ions to pass through. 3C products include computers (Computer), communications (Communication) and consumer electronics (ConsumerElectronics), which are the main fields of application of lithium batteries. For lithium batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M10/0525H01M50/403H01M50/446
CPCH01M10/0525H01M50/403Y02E60/10
Inventor 徐锋袁海朝邓云飞马文献
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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