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A kind of high temperature resistant lithium ion battery separator and preparation method thereof

A technology for lithium ion batteries and battery separators, applied in battery pack components, circuits, electrical components, etc., can solve problems such as restricting the development of lithium ion batteries, low lithium ion conductivity, and increasing battery impedance, and achieve consistent voltage and quality. High, shrinkage reduction effect

Active Publication Date: 2019-08-06
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

Due to the urgent demand for high-power, high-speed charging and discharging lithium-ion batteries in all walks of life, people have gradually realized that the separator has the following defects during use: promoting the precipitation of dendrites can easily puncture the separator and cause a short circuit; the wettability of the electrolyte is low As a result, the conductivity of lithium ions is low; the temperature resistance is poor, and the high temperature often generated during excessive charging and discharging causes the diaphragm to shrink or even melt, causing the electrodes to directly contact short circuit, causing fire or even explosion and causing personal injury
[0007] At present, the resistance to lithium dendrite penetration, high temperature resistance and heat shrinkage of traditional coated separators cannot meet the requirements under certain temperature conditions. Therefore, more and more attention is focused on composite separators. field, but the existing composite separators are basically coated with a layer of coating slurry on one or both sides of the battery separator to form a composite layer to meet the needs of the separator, but the paint coating in this way Regardless of the thickness, the impedance of the battery will increase, which restricts the further development of lithium-ion batteries and related industries

Method used

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  • A kind of high temperature resistant lithium ion battery separator and preparation method thereof
  • A kind of high temperature resistant lithium ion battery separator and preparation method thereof
  • A kind of high temperature resistant lithium ion battery separator and preparation method thereof

Examples

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preparation example Construction

[0044] ①Al 2 o 3 Preparation of coating slurry:

[0045] Add N-methylpyrrolidone and aluminum oxide powder to a vacuum, high-speed, planetary stirring device with ultrasonic oscillation function at the same time. h, to obtain slurry;

[0046] Add one or more mixtures of sodium polyacrylate, sodium polymetaphosphate, sodium orthophosphate, sodium silicate, sodium lauryl sulfate, and ammonia water to the slurry in an amount of 0.5% of the slurry; Add static eliminator, the addition amount is 0.3% of the slurry, high-speed stirring and ultrasonic oscillation for 0.5h;

[0047] Add one or more mixtures of alcohol, propylene carbonate, glycerin, dimethyl sulfoxide, polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, polyvinyl alcohol, and the amount added is the slurry 0.5%; high-speed stirring and ultrasonic oscillation for 0.5h;

[0048] Add PVDF glue with a slurry amount of 5%, and sodium carboxymethylcellulose with a slurry amount of 0.3%; high-speed st...

Embodiment 1

[0085] Take a 16um wet-process PE separator, select one side of the wet-process PE separator and use a micro-gravure roller to coat 2um thick Al 2 o 3 Apply the slurry to form a coating film, and then use a dipping coating device to coat 1um oily SiO on both sides of the coating film 2 Coating the slurry to obtain Al with a thickness of 20 μm 2 o 3 and SiO 2 Two kinds of slurry-coated composite Li-ion battery separators with a structure of SiO 2 Coating-Al 2 o 3 Coating-PE Separator-SiO 2 coating.

[0086] The preferred preparation method of the lithium-ion battery diaphragm in this embodiment is:

[0087] A. Preparation of coating slurry: preparation of Al 2 o 3 Coating paste and SiO 2 Coating slurry, standby;

[0088] B. Pretreatment of battery diaphragm: Use ozone with a flow rate of 0.5L / min to pretreat the diaphragm for 120s, and reserve it; if the pretreatment time is too short, it will affect the surface adhesion of the diaphragm and the appearance quality o...

Embodiment 2

[0092] Take a 10um wet-process PP diaphragm, and coat 2um-thick SiO on both sides of the wet-process PP diaphragm with a dip coating device 2 Apply the slurry to form a coating film, and then use a dip coating device to coat 1um oily Al on both sides of the coating film 2 o 3 Coating the slurry to obtain SiO with a thickness of 16 μm 2 and Al 2 o 3 Two kinds of slurry-coated composite Li-ion battery separators with a structure of Al 2 o 3 Coating - SiO 2 Coating - PP Separator - SiO 2 Coating-Al 2 o 3 coating.

[0093] The preferred preparation method of the lithium-ion battery diaphragm in this embodiment is:

[0094] A. Preparation of coating slurry: preparation of Al 2 o 3 Coating paste and SiO 2 Coating slurry;

[0095] B. Pretreatment of battery diaphragm: use ozone with a flow rate of 1L / min to pretreat the diaphragm for 100s, and reserve it; if the pretreatment time is too short, it will affect the surface adhesion of the diaphragm and the appearance quali...

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Abstract

A high-temperature resistant multi-coated lithium ion battery separator, belonging to the technical field of battery separators, including a coating film composed of a battery separator coated with coating slurry on one or both sides. The surface or both sides are coated with an additional layer of slurry, and the additional layer of slurry includes at least one coating layer composed of coating slurry. The present invention also provides a method for preparing a lithium-ion battery separator with high temperature resistance and multiple coatings. The battery separator not only has the higher safety brought by the coated separator to the battery, but also can withstand high temperatures and reduce the risk of The shrinkage rate of the separator increases the overall life of the battery and improves the affinity between the separator and the electrolyte. It ensures that the separator is fully swollen by the electrolyte and helps extend the cycle life of the battery.

Description

technical field [0001] The invention belongs to the technical field of battery separators, and relates to a high-temperature-resistant lithium-ion battery separator, in particular to a high-temperature-resistant lithium-ion battery separator with multiple coatings and a preparation method thereof. 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] Lithium batteries have the advantages of high specific energy, small size, light weight, less self-discharge, long cycle life, and no pollution. They have been used more and more widely. The market extends to mobile phones, laptop computers, digital cameras, power tools, Electric bicycles, electric motorcycles, electric vehicles, energy storage,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/426
CPCH01M50/403H01M50/426Y02E60/10
Inventor 徐锋袁海朝邓云飞马文献田海龙
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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