High-temperature-resistant diaphragm paper for lithium ion battery and preparation method thereof

A lithium-ion battery and separator paper technology, which is applied in the direction of secondary batteries, battery pack parts, secondary battery repair/maintenance, etc., can solve the problem of easy falling off of inorganic powder, save the coating process and improve safety Performance and service life, effects of improving mechanical properties and heat resistance

Inactive Publication Date: 2022-07-12
JIANGSU HORIZON NEW ENERGY TECH CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, the solution to the above problems is to apply an inorganic coating on the surface of the polyolefin diaphragm to improve the heat shrinkage of the polyolefin diaphragm, but there is a problem that the inorganic powder is easy to fall off

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
  • High-temperature-resistant diaphragm paper for lithium ion battery and preparation method thereof
  • High-temperature-resistant diaphragm paper for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] like figure 1 As shown, the present invention also provides a method for preparing high temperature resistant diaphragm paper for lithium ion batteries, comprising the following steps: step S1, respectively preparing a diaphragm paper substrate and a mixed slurry; step S2, using a vacuum impregnation method to prepare the mixed slurry The material is loaded onto the substrate of the separator paper, and then hot-pressed and dried to obtain a high-temperature resistant separator paper for lithium ion batteries.

[0015] In this embodiment, specifically, the preparation of the diaphragm paper substrate in step S1 includes: weighing an appropriate amount of insulating carbon fiber, adding it to a 3 mol / L sodium hydroxide alkaline aqueous solution, pre-processing, and then adding distilled water to the insulating carbon fiber Suction filtration, wash to neutrality, and dry; make the dispersant into a dispersion of a certain concentration, weigh an appropriate amount of insu...

Embodiment 1

[0024] Weigh 0.3 g of insulating carbon fiber, add it to 500 mL of 3 mol / L sodium hydroxide alkaline aqueous solution, pretreat for 3 min, and then filter the insulating carbon fiber with distilled water until it is neutral, and dry. Polyacrylamide (PAM) was dissolved in water by stirring to make a dispersion with a concentration of 3wt%. The mass of the dispersion was 1kg. The pretreated insulating carbon fiber and 0.1g cotton fiber were added to the dispersion. The dispersing machine is used for dispersing and dispersing. After the fibers are uniformly dispersed, the fiber dispersion is poured into the paper machine, the dispersion is filtered off, and dried in an oven at 70°C to obtain a membrane paper matrix.

[0025] 20 g of phenolic resin, 40 g of alumina, and 2 g of curing agent were added to 138 g of ethanol solution, and stirred evenly to obtain a mixed slurry. Put the membrane paper substrate into the vacuum impregnation kettle, adjust it to a negative pressure state...

Embodiment 2

[0027] Weigh 0.2 g of insulating carbon fiber, add it to 500 mL of 3 mol / L sodium hydroxide alkaline aqueous solution, pre-treat for 3 min, and then filter the insulating carbon fiber with distilled water until it is neutral, and dry. Dissolve PE0 in water by stirring to make a dispersion with a concentration of 5wt%, the mass of the dispersion is 1kg, add the pretreated insulating carbon fiber and 0.2g cotton fiber into the dispersion, and use a fiber dispersing machine to disperse and disperse. , after the fibers are evenly dispersed, the fiber dispersion is poured into a paper machine, the dispersion is filtered off, and dried in an oven at 70°C to obtain a membrane paper matrix.

[0028] 20 g of phenolic resin, 40 g of alumina, and 2 g of curing agent were added to 138 g of ethanol solution, and stirred evenly to obtain a mixed slurry. Put the membrane paper substrate into the vacuum impregnation kettle, adjust it to a negative pressure state, pump the mixed slurry into th...

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

No PUM Login to view more

Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to high-temperature-resistant diaphragm paper for a lithium ion battery and a preparation method of the high-temperature-resistant diaphragm paper. Wherein the mixed fiber matrix comprises insulating carbon fibers and cotton fibers; the inorganic powder particles are loaded on the surface of the mixed fiber matrix; according to the high-temperature-resistant diaphragm paper for the lithium ion battery, the mixed fibers with excellent high-temperature resistance and excellent mechanical performance are adopted, battery short circuit caused by lithium dendrite puncture can be effectively avoided, the safety performance of the lithium ion battery is improved, and the service life of the lithium ion battery is prolonged. The prepared diaphragm paper contains the inorganic powder particles, so that the mechanical property and the heat resistance of the diaphragm paper are further improved, the affinity of the diaphragm paper and electrolyte is improved, meanwhile, the coating procedure is omitted through direct vacuum impregnation of the mixed fibers and the inorganic powder particles, the efficiency is improved, and the production cost is reduced. And the problem that inorganic powder particles fall off in the using process is also solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high temperature resistant separator paper for lithium ion batteries and a preparation method thereof. Background technique [0002] As a clean secondary energy source, lithium-ion batteries are widely used in portable electronic products, electric vehicles and energy storage fields due to their advantages of high voltage, high energy, and fast charging and discharging. Lithium-ion batteries generally consist of three main parts: a positive electrode, a negative electrode, and a separator carrying an electrolyte. The separator is located between the positive and negative electrodes, and its main function is to prevent the internal short circuit of the battery, and act as an electrolyte carrier to provide a channel for the movement of lithium ions. The performance of the separator determines the internal resistance and internal interface structure of t...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/429H01M50/431H01M50/44H01M50/449H01M50/489H01M50/403H01M10/0525H01M10/42
CPCH01M50/403H01M50/4295H01M50/431H01M50/44H01M50/449H01M50/489H01M10/0525H01M10/4235Y02P70/50
Inventor 李梦佳张立斌赵海玉沈亚定
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap