Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of flame-retardant cellulose diaphragm for lithium battery and preparation method thereof

A technology for flame-retardant cellulose and lithium battery separators, applied in secondary batteries, battery pack parts, separators/films/diaphragms/spacers, etc., can solve the problem of poor electrolyte infiltration performance, affecting battery safety performance, Problems such as poor thermal stability

Active Publication Date: 2017-01-04
中科深蓝汇泽新能源(青岛)有限责任公司
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cellulose also has disadvantages: it is easy to burn in case of fire, which greatly limits its direct use in life, industry and other fields. requirements
Although polyolefin separators have their own advantages, such as high mechanical strength and excellent electrochemical stability, the disadvantages are also very obvious: poor electrolyte wettability, poor thermal stability
Poor electrolyte wetting performance will affect the rate performance and long cycle performance of lithium batteries; poor thermal stability will affect the safety performance of batteries

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 flame-retardant cellulose diaphragm for lithium battery and preparation method thereof
  • A kind of flame-retardant cellulose diaphragm for lithium battery and preparation method thereof
  • A kind of flame-retardant cellulose diaphragm for lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 40 g of cellulose pulp, 10 g of sodium alginate and 10 g of ammonium phosphate were dispersed in 2 L of deionized water to control the beating degree of 55 o The SR is beaten to obtain a uniform cellulose slurry. The obtained cellulose slurry is subjected to papermaking on a paper machine, and then dehydrated into a film to obtain a wet cellulose non-woven film. Then it was rolled by 10 MPa and dried in a 75˚C oven to remove the excess water in the paper layer, and finally wound to obtain a flame-retardant cellulose separator with a thickness of 60 μm.

Embodiment 2

[0020] Disperse 20 g of cellulose pulp in 1 L of deionized water and control the beating degree to 70 o The SR is beaten to obtain a cellulose slurry. The obtained cellulose slurry is subjected to papermaking on a paper machine, and then dehydrated into a film to obtain a wet cellulose non-woven film. 10 g of carrageenan and 10 g of zinc borate were dissolved in 200 mL of water to obtain a polymer material flame retardant solution. The polymer material flame retardant solution was coated on the cellulose diaphragm made above, and then passed through a 20 MPa roll to 80 ˚C oven drying, a flame-retardant cellulose membrane with a thickness of 50 μm is obtained.

Embodiment 3

[0022] Disperse 30 g of cellulose pulp in 1 L of deionized water to control the beating degree to 85 o The SR is beaten to obtain a cellulose slurry. The obtained cellulose slurry is subjected to papermaking on a paper machine, and then dehydrated into a film to obtain a wet cellulose non-woven film. 10 g of polyimide and 10 g of decabromodiphenyl ether are dissolved in 500 mL of N,N-dimethylacetamide to obtain a polymer material flame-retardant solution, and the polymer material flame-retardant solution is applied to the above preparation Then, it was dried in an oven at 95˚C by 30 MPa roll pressing to obtain a flame-retardant cellulose diaphragm with a thickness of 40 μm.

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
thicknessaaaaaaaaaa
porosityaaaaaaaaaa
limiting oxygen indexaaaaaaaaaa
Login to View More

Abstract

The invention discloses a flame-retardant cellulose diaphragm for a lithium battery and a preparation method thereof, belonging to the field of lithium battery materials. The lithium battery diaphragm provided by the present invention is a flame-retardant cellulose diaphragm, which is prepared by adding a flame retardant in the wet sheet-making process or coating the flame retardant in post-processing. The lithium battery diaphragm of the present invention has a thickness of 10µm-500µm, an air permeability of 1s-800s / 100cc, a porosity of 30%-95%, an electrolyte absorption rate of 50%-1000%, and a mechanical tensile strength of 5MPa-120MPa. Good thermal stability and excellent flame retardancy. The lithium battery diaphragm prepared by the invention has good electrolyte wetting characteristics, high ion conductivity and excellent electrochemical interface performance, and greatly improves the rate performance, long cycle life and safety performance of the lithium battery. Therefore, the separator can be applied to lithium metal batteries (including lithium-sulfur batteries), lithium-ion power batteries, and energy storage batteries.

Description

Technical field [0001] The invention relates to the field of lithium battery materials, in particular to a flame-retardant cellulose diaphragm for lithium batteries and a preparation method thereof. Background technique [0002] Lithium batteries have many advantages, such as high energy density, high power density, and long cycle life. Therefore, they have attracted great attention in the fields of portable electronic equipment, power batteries and energy storage batteries. Lithium batteries are mainly composed of four parts: positive electrode material, negative electrode material, electrolyte and separator. As one of the key components of lithium batteries, the separator plays a role in preventing contact between the positive and negative electrodes, preventing battery short circuits, and transmitting lithium ions. The performance of the diaphragm directly affects the rate performance, cycle life, high and low temperature performance and safety performance of the lithium batt...

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): H01M2/16H01M50/40H01M50/403H01M50/414H01M50/423
CPCH01M10/4235H01M10/0525H01M50/409H01M50/403Y02E60/10
Inventor 崔光磊张建军岳丽萍孔庆山刘志宏姚建华
Owner 中科深蓝汇泽新能源(青岛)有限责任公司