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

A kind of novel lithium-ion battery diaphragm and preparation method thereof

A technology for lithium-ion batteries and diaphragms, applied in the field of preparing lithium-ion battery diaphragms, to achieve the effect of improving the performance of the pro-retaining liquid

Active Publication Date: 2016-02-03
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention provides a novel lithium-ion battery diaphragm and a preparation method thereof to solve various shortcomings and deficiencies in the prior art

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
  • A kind of novel lithium-ion battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The preparation method of the novel lithium ion battery diaphragm of the present invention includes the following process steps:

[0034] (1) Soak the cotton fiber in water for 2-8h, defuse and beaten to obtain cotton pulp with a beating degree of 60°SR~80°SR;

[0035] (2) Wash the polypropylene fiber with sodium dodecylbenzene sulfonate and dry it;

[0036] (3) Mix the cotton pulp of the first step with the polypropylene fiber of the second step according to the mass ratio, add dispersant, adhesive, retention and filter aid, add water to dissolve and mix to make a slurry;

[0037] (4) The obtained slurry is dehydrated and squeezed through a copper mesh, and then dried in a dryer;

[0038] (5) Hot press at 135℃~150℃ to obtain finished diaphragm.

[0039] In order to improve the lyophilic performance and porosity of the lithium ion battery separator, the present invention adopts a wet papermaking process and uses cotton fiber and polypropylene fiber as the main substrate, which gre...

example 1

[0042] Step 1. Soak 360g cotton fiber in 5L water for 4h, add 18L water to the pulp tank of the beater, and beat the cotton fiber under pressure. The beating degree is measured every 10 minutes, and the beating degree is 60°, 65°, 70. °, 75°, 80° cotton pulp is ready for use.

[0043] Step 2: Wash the polypropylene fiber with sodium dodecylbenzene sulfonate to remove the grease on the surface of the polypropylene fiber, and then dry the fiber at 50°C-60°C.

[0044] Step 3. According to the basis weight of 40g / m3~50g / m3, mix the slurry of step 1 and the polypropylene fiber material of step 2 at a mass ratio of 2:1, and then add 0.5% dispersant and 5% glue Viscosity, 0.5% flow aid and filter aid, add water to disintegrate and disperse the fibers to obtain a slurry.

[0045] Step 4: Dewatering the slurry prepared in step 3 through a copper mesh, then squeezing to remove excess water in the paper, and then drying it in a dryer at 120°C to obtain a diaphragm.

[0046] Step 5: Hot-press th...

example 2

[0048] Step 1. Soak 360g cotton fiber in 5L water for 4h, add 18L water to the pulp tank of the beater, and beat the cotton fiber under pressure. The beating degree is measured every 10 minutes, and the beating degree is 60°, 65°, 70 °, 75°, 80° cotton pulp is ready for use.

[0049] Step 2: Wash the polypropylene fiber with sodium dodecylbenzene sulfonate to remove the grease on the surface of the polypropylene fiber, and then dry the fiber at 50°C-60°C.

[0050] Step 3. According to the basis weight of 40g / m3~50g / m3, mix the cotton pulp and polypropylene fiber material at a mass ratio of 1:1, and then add 1.0% dispersant, 8% adhesive, and 1.0% glidant Filter aid, add water to disperse, disperse and mix the fibers uniformly to obtain a slurry.

[0051] Step 4: Dewatering the slurry prepared in step 3 through a copper mesh, then squeezing to remove excess water in the paper, and then drying it in a dryer at 120°C to obtain a diaphragm.

[0052] Step 5: Hot-press the obtained diaphrag...

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
lengthaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to a novel lithium-ion battery diaphragm and a preparation method thereof. The diaphragm adopts cotton fiber and polypropylene fiber as main base materials and is obtained through a wet papermaking process. The lithium-ion battery separator provided by the method has the advantages of good liquid retention performance, good thermal stability, high porosity, uniform pore distribution, small pore size, etc., which solves the problem of poor liquid retention performance and good thermal stability of traditional battery separators And the technical flaw of low porosity.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a method for preparing lithium-ion battery diaphragms by using polypropylene fibers and cotton fibers as main raw materials. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, long cycle life, no memory effect, safety, reliability, and fast charging and discharging. The positive electrode material, negative electrode material, diaphragm, and electrolyte are the four types of lithium-ion batteries. key material. [0003] Lithium-ion battery separator plays the role of electronic insulation between the positive and negative electrodes of the battery, and at the same time provides a microporous channel that allows lithium ions to reciprocate freely between the positive and negative electrodes. The separator is an important component that affects the performance of lithium-ion batteries. Battery capacity, internal resistance, high-s...

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 Patents(China)
IPC IPC(8): H01M2/16H01M50/417H01M50/44H01M50/489
CPCH01M50/446H01M50/403Y02E60/10
Inventor 张雄飞陈启杰申飞燕
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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