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A kind of preparation method of lithium-ion battery diaphragm of self-cooling anti-closing

A lithium-ion battery, self-cooling technology, applied in the field of preparation of lithium-ion battery separators, can solve the problems of lithium battery scrap, permanent closed pores, economic losses, etc., and achieve the effects of improving anti-corrosion performance, delaying closed pores, and improving tissue properties

Active Publication Date: 2020-03-17
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] Lithium-ion battery separators currently on the market, whether they are ceramic alumina separators or PVDF separators, are limited by the material of the separator itself. When the temperature of the separator exceeds 130°C, the separator will permanently close the pores, and the lithium-ion battery separator will lose its transparency. The function of lithium ion is exceeded, which leads to the scrapping of lithium battery
In real life, lithium batteries are often exposed to high temperatures in a short period of time due to human operations or accidents. If the temperature exceeds the closed cell temperature, the lithium batteries will be scrapped and cause economic losses.

Method used

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  • A kind of preparation method of lithium-ion battery diaphragm of self-cooling anti-closing
  • A kind of preparation method of lithium-ion battery diaphragm of self-cooling anti-closing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1), preparation of erythritol modified ceramic slurry

[0030] Add deionized water and sodium polyacrylate to the planetary mixer, then add ammonia water to adjust the pH value, and adjust the pH value to between 7.5-8.5, preferably 8. The amount of dispersant added is 1% of the weight of the primary mixed slurry 3%, followed by stirring and ultrasonic vibration at the same time, the stirring speed is 1200r / min, and it lasts for 1h. The tank of the planetary mixer is a multi-blade stirring paddle, which also rotates while revolving, so that the material flows up and down and around. Therefore, the mixing effect can be achieved in a short time. The inner wall of the tank is finished by a large vertical lathe, and then automatically polished by a large polishing machine to ensure that the movable scraper on the planetary carrier completely scrapes off the material on the inner wall of the tank when rotating. The planetary mixer is equipped with an input-type ultrasonic v...

Embodiment 2

[0043] (1), preparation of erythritol modified ceramic slurry

[0044] Add deionized water, sodium polymetaphosphate, and sodium silicate to a planetary mixer equipped with a drop-in ultrasonic vibration plate, and the dispersant accounts for 1% of the total weight of the first-stage mixed slurry, followed by stirring and ultrasonic vibration at the same time, Form a primary mixed slurry;

[0045] Add ceramic powder with a median particle size of 0.5-0.7 μm to the primary mixing slurry, and the proportion of ceramic powder is 10% of the total weight of the secondary mixing slurry, followed by stirring and ultrasonic vibration at the same time to form a secondary mixing slurry;

[0046] Add erythritol to the secondary mixed slurry, the addition amount is 10% of the weight of the secondary mixed slurry (the total amount should not be too low, otherwise it will affect the heat absorption during phase transition), and then stir and ultrasonic Vibrate to form a three-stage mixed ...

Embodiment 3

[0052] (1), preparation of erythritol modified ceramic slurry

[0053] Add deionized water and sodium lauryl sulfate to a planetary mixer equipped with a drop-in ultrasonic vibrating plate, and the dispersant accounts for 2% of the total weight of the primary mixed slurry, followed by simultaneous stirring and ultrasonic vibration to form a Grade mixed slurry;

[0054] Add ceramic powder with a median particle size of 0.7-0.9 μm to the primary mixing slurry, and the proportion of ceramic powder is 20% of the total weight of the secondary mixing slurry, followed by stirring and ultrasonic vibration at the same time to form a secondary mixing slurry;

[0055] Adding erythritol to the secondary mixed slurry in an amount of 15% of the weight of the secondary mixed slurry, followed by simultaneous stirring and ultrasonic vibration to form a tertiary mixed slurry;

[0056] Add water-based acrylic latex and sodium carboxymethyl cellulose solution in the three-stage mixed slurry, th...

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Abstract

A method for preparing a self-cooling and anti-closing lithium-ion battery diaphragm belongs to the technical field of battery diaphragms. A self-cooling and anti-closing film is obtained by coating a slurry layer on one side or both sides of a base film, and then drying it. Porous lithium-ion battery separator, the slurry layer is ceramic slurry or erythritol modified ceramic slurry, and at least one end surface of the base film is coated with erythritol modified ceramic slurry, and discloses A specific method for preparing erythritol modified ceramic slurry is provided. The preparation method in the present invention provides a stable and efficient process for the production of self-cooling and anti-closing lithium-ion battery separators. The prepared erythritol modified Ceramic slurry has both low shrinkage rate and high safety at high temperature of ceramic slurry.

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 self-cooling and anti-closing 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 lithium battery application. For lithium batteries of 3C products, onl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/434H01M50/449H01M50/457
CPCH01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 徐锋袁海朝马文献邓云飞
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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