Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Water-based PVDF coated separator for lithium-ion batteries and preparation method thereof

A lithium-ion battery, water-based technology, applied in secondary batteries, battery components, secondary battery repair/maintenance, etc., to achieve stable performance, extended overall life, and good overall performance

Active Publication Date: 2017-08-25
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
View PDF5 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a water-based PVDF coated lithium-ion battery separator and a preparation method thereof in order to solve the problem that the high temperature resistance, heat-resistant shrinkage rate and strength of the coated separator in the prior art cannot meet the requirements under certain temperature conditions , the hig...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Water-based PVDF coated separator for lithium-ion batteries and preparation method thereof
  • Water-based PVDF coated separator for lithium-ion batteries and preparation method thereof
  • Water-based PVDF coated separator for lithium-ion batteries and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A water-based PVDF-coated lithium-ion battery diaphragm, comprising a base film with a coating slurry adhered to one or both sides of the film surface, the base film is a PP diaphragm, and the coating slurry is calculated by mass percentage, including water-based PVDF 15% powder, 8% acrylic adhesive, 0.05% fluorocarbon surfactant and cellulose ether dispersant, 0.04% agarin, 0.04% phthalate diester, trimethylolpropane tripropionate 0.04%, CMC solution 0.5%, and the balance is deionized water.

[0030] Described coating slurry is configured by following method:

[0031] A. Add fluorocarbon surfactant and cellulose ether dispersant to water for high-speed dispersion for 10-15 minutes, control the speed at 2000-5000r / min to obtain a mixed solution, then add water-based PVDF powder with the quality of the mixed solution to it, and sand mill Machine high-speed grinding, control the speed of 1000-3000r / min, disperse the water-based PVDF powder evenly to form a PVDF dispe...

Embodiment 2

[0041] A water-based PVDF-coated lithium-ion battery diaphragm, comprising a base film with a coating slurry adhered to one or both sides of the film surface, the base film is a fiber diaphragm, and the coating slurry is calculated by mass percentage, including water-based PVDF Powder 10%, Acrylic Adhesive 9%, Fluorocarbon Surfactant and Cellulose Ether Dispersant 0.07%, Agarin 0.06%, Phthalate Diester 0.05%, Trimethylolpropane Tripropionate 0.07%, CMC solution 0.8%, and the balance is deionized water.

[0042] The above-mentioned coating slurry coating lithium-ion battery separator is prepared by the following method, using a vertical double-sided coating machine or a horizontal high-speed coating machine, and the coating device includes a base film unwinding shaft 1 and a rubber coating roller 2 arranged in sequence , a heating and drying mechanism and a reel 8, the base film unwinding reel 1 is wound with a base film, one end of the base film protrudes from the base film un...

Embodiment 3

[0048] A water-based PVDF coated lithium-ion battery diaphragm, comprising a base film with a coating slurry adhered to one or both sides of the film surface, the base film is a non-woven diaphragm, and the coating slurry is calculated by mass percentage, comprising: Water-based PVDF powder 12%, acrylic adhesive 11%, fluorocarbon surfactant and cellulose ether dispersant 0.08%, agarin 0.05%, phthalate diester 0.06%, trimethylolpropane tripropylene Ester 0.05%, CMC solution 1%, the balance is deionized water.

[0049] The above-mentioned coating slurry coating lithium-ion battery separator is prepared by the following method, using a vertical double-sided coating machine or a horizontal high-speed coating machine, and the coating device includes a base film unwinding shaft 1 and a rubber coating roller 2 arranged in sequence , a heating and drying mechanism and a reel 8, the base film unwinding reel 1 is wound with a base film, one end of the base film protrudes from the base f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Unwind tensionaaaaaaaaaa
Unwind tensionaaaaaaaaaa
Unwind tensionaaaaaaaaaa
Login to View More

Abstract

The invention provides a water-based PVDF coated separator for lithium ion batteries, and belongs to the technical field of battery separators. The water-based PVDF coated separator comprises a basal membrane, wherein coating slurry is adhered to one side or both sides of the basal membrane, and the coating slurry is prepared from the following components in percentage by mass: 10-15% of water-based PVDF powder, 3-6% of an acroleic acid adhesive, 0.2-0.5% of a fluorocarbon surfactant and a cellulose ether dispersing agent, 0.04-0.06% of agaroidin, 0.04-0.08% of dimethyl phthalate, 0.04-0.08% of trimethylolpropane triacrylate, 0.5-2% of a CMC solution and the balance of deionized water. The invention also provides a preparation method of the water-based PVDF coated separator for lithium ion batteries. The water-based PVDF coated battery separator has higher safety like that brought by a ceramic coated separator, and also can resist high temperature, decrease the shrinkage of the separator in high-temperature conditions and increase the overall life time of a battery. The preparation method provided by the invention provides a relatively mature and efficient process for preparing the water-based PVDF coated separator for lithium ion batteries, has a higher degree of automation in operation and obviously improves the production efficiency of separators.

Description

technical field [0001] The invention belongs to the technical field of battery separators, relates to battery separators of lithium-ion batteries, in particular to a water-based PVDF-coated lithium-ion battery separator and a preparation method thereof. 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, only PP separator and PE separator are used, and its performance can be obtained. nice to meet. However, with the continuous development of electric vehicles, the performance of lithium batteries must be further improved to meet the requirements of electric vehicles. Lithium batteries have more stringe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M2/16H01M2/14H01M10/42H01M50/403H01M50/411H01M50/449H01M50/489
CPCH01M10/4235H01M50/403H01M50/411Y02E60/10
Inventor 徐锋袁海朝邓云飞马文献
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com