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Composite nanofibre diaphragm with thermal pore-closing function, preparation method and energy storage device

A technology of composite nanofibers and nanofibers, applied in the direction of separators/films/diaphragms/spacers, hybrid capacitor separators, structural parts, etc., can solve problems such as explosions and battery combustion, and achieve simple production processes and convenient transfer , suitable for large-scale production

Active Publication Date: 2015-04-01
宁波柔创纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, there are patents CN103270639A, CN103943806A, etc., but they still cannot meet the excellent thermal dimensional stability and good self-closing performance that the diaphragm material should have at the same time, which will cause potential hazards such as combustion and explosion of the battery.

Method used

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  • Composite nanofibre diaphragm with thermal pore-closing function, preparation method and energy storage device
  • Composite nanofibre diaphragm with thermal pore-closing function, preparation method and energy storage device
  • Composite nanofibre diaphragm with thermal pore-closing function, preparation method and energy storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Fibrillated cellulose nanofibers: low-melting polymer nanofibers = 9:1 cellulose nanofibers and low-melting polymer nanofibers (polymethyl methacrylate and polysuccinic acid) separated from nano-sized wood materials Glycol esters) are dispersed in a solvent, and then the solution is uniformly uniformed by high-speed mechanical agitation to prepare a slurry. Add a solvent to dilute the slurry to 0.01%, dehydrate the diluted slurry on the Internet; press and dry; hot-roll forming at a molding temperature of 100°C and a line pressure of 100kg / cm, and then roll paper, Rewinding, slitting and packaging to produce battery separators.

[0049] The above-mentioned closed-cell composite separator exhibits excellent properties, for example, at 200°C, the porosity before and after 2h heat treatment is 56% and 55%, respectively; at 200°C, the thermal shrinkage rate is almost 0 in 30min; , The Gurley value (s / 100cc) before and after 2h heat treatment was 23 and 23.

Embodiment 2

[0051] The fibrillated cellulose nanofibers: low-melting polymer nanofibers = 7:3 seaweed cellulose nanofibers and low-melting polymer nanofibers (vinylidene fluoride-based polymers) were dispersed in a solvent, and then passed through a high-speed machine Stir to make the solution uniform throughout to prepare a slurry. Add a solvent to dilute the slurry to 0.01%, dehydrate the diluted slurry on the Internet; press and dry; hot-roll forming at a molding temperature of 100°C and a line pressure of 100kg / cm, and then roll paper, Rewinding, slitting and packaging to produce battery separators.

[0052] The above-mentioned closed-cell composite separator exhibits excellent properties, for example, the porosity before and after heat treatment at 200°C for 2h is 56% and 30%, respectively; the thermal shrinkage rate is almost 1% at 200°C for 30min; the percentage of liquid absorption is 300% ; 200 ℃, Gurley value (s / 100cc) before and after 2h heat treatment is 23 and 800.

Embodiment 3

[0054] Bacterial cellulose nanofibers and low-melting-point polymer nanofibers (polyurethane, polyvinyl chloride, and polyolefin) obtained by culturing strains of fibrillated cellulose nanofibers: low-melting-point polymer nanofibers = 5:5 were dispersed in a solvent , and then prepare the slurry by high-speed mechanical agitation to make the solution uniform throughout. Add a solvent to dilute the slurry to 0.01%, dehydrate the diluted slurry on the Internet; press and dry; hot-roll forming at a molding temperature of 100°C and a line pressure of 100kg / cm, and then roll paper, Rewinding, slitting and packaging to produce battery separators.

[0055] The above-mentioned closed-cell composite diaphragm exhibits excellent properties, for example, at 200°C, the porosity before and after 2h heat treatment is 54% and 18%, respectively; at 200°C, 1.4% heat shrinkage rate at 30min; 285% liquid absorption percentage; 200% ℃, Gurley value (s / 100cc) before and after 2h heat treatment i...

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Abstract

The invention discloses a composite nanofibre diaphragm with a thermal pore-closing function, a preparation method and an energy storage device, and relates to lithium ion batteries, lithium-sulphur batteries, supercapacitors, lead-acid batteries, alkaline batteries, zinc air batteries, sodium-ion batteries and fibre diaphragms thereof. The composite nanofibre diaphragm with the thermal pore-closing function is of a non-woven fabric structure, and formed by mutually crosslinking and compounding fibrillated cellulose nanofibres and at least one low-melting-point polymer nanofibres; the low-melting-point polymer nanofibres are nanofibres containing polyolefin and polyesters. The thickness of the composite nanofibre diaphragm with the thermal pore-closing function can be 10-80 mu m, the pore-closing temperature is 130-170 DEG C, the fibre film does not shrink after pore-closing, and the thermal shrinkage rate in case of heating for 30min at high temperature of 200 DEG C is less than 2%. The composite nanofibre diaphragm is capable of realizing the thermal pore-closing function, thus avoiding the direct contact of the positive electrode and the negative electrode of a battery due to the action of thermal inertia, and remarkably improving the safety of the energy storage devices above-mentioned.

Description

technical field [0001] The invention belongs to the technical field of batteries, and the batteries include lithium-ion batteries, lithium-sulfur batteries, supercapacitors, lead-acid batteries, alkaline batteries, zinc-air batteries and sodium-ion batteries. The invention relates to a composite nanofiber diaphragm with a closed cell function and a preparation method thereof. The invention also relates to the production of such membranes and their use as battery separators. Background technique [0002] Composite nanofiber separators can be used as separators in batteries such as lithium-ion batteries, lithium-sulfur batteries, supercapacitors, lead-acid batteries, zinc-air batteries, and sodium-ion batteries. At present, lithium-ion batteries have been widely used in portable electronic products such as mobile phones, notebook computers, and cameras because of their advantages such as high energy density, long cycle life, fast charge and discharge, no pollution, and no mem...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01G11/52H01M50/403H01M50/409H01M50/489
CPCH01G11/52H01M50/44H01M50/403H01M50/489H01M50/409Y02E60/13Y02E60/10
Inventor 宣萱解明
Owner 宁波柔创纳米科技有限公司
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