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Composite nanofiber diaphragm for electrochemical element, preparation method and energy storage device

A technology of composite nanofibers and electrochemical components, which is applied in the direction of electrical components, battery pack components, circuits, etc. Solve the problems of poor wettability and liquid absorption ability, and achieve the effects of simple manufacturing process, prevention of fire and combustion, and excellent flame retardancy

Inactive Publication Date: 2016-06-08
NINGBO ATMK LITHIUM ION TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, the polyolefin separator has poor air permeability, which cannot well meet the needs of rapid charging and discharging of the battery, which affects the cycle life of the battery; in addition, the polyolefin separator has poor electrolyte wettability and liquid absorption ability, which affects the rate performance and performance of the lithium battery. Long cycle performance; Based on the above, it is necessary to invent a battery separator with high temperature dimensional stability, good air permeability, good electrolyte wettability and liquid absorption capacity

Method used

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  • Composite nanofiber diaphragm for electrochemical element, preparation method and energy storage device
  • Composite nanofiber diaphragm for electrochemical element, preparation method and energy storage device
  • Composite nanofiber diaphragm for electrochemical element, preparation method and energy storage device

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Cellulose nanofibers, polypropylene fibers (low-melting point polymer nanofibers), and aramid fibers (flame-retardant materials) separated from nanometer-sized wood materials are dropped into dispersant deionized water by mass ratio of 75%, 20%, and 5%. , and then prepare the slurry by high-speed mechanical stirring to make the solution uniform as a whole, add additive acetic acid to the slurry, and the mass content of acetic acid accounts for 0.1% of the absolute dry weight of nanocellulose fibers. Add water to dilute the slurry to a mass concentration of 0.01%. The diluted slurry is dehydrated and formed on the Internet; pressed and dried; hot-rolled at a forming temperature of 120°C and a line pressure of 120kg / cm. Rolling, rewinding, cutting and packaging to prepare composite nanofiber separators for batteries.

[0040] The thickness of the composite nanofiber separator is 20 μm, the porosity is 45%, and the LOI is 30%; the dimensional shrinkage rate is 0.05% at 200...

Embodiment 2

[0042] Seaweed cellulose nanofibers, polyethylene-vinyl acetate copolymer (low melting point polymer nanofibers), phenolic fibers (flame retardant materials) are dropped into dispersant isopropanol by mass ratio of 20%, 65%, and 15%, And then the slurry is prepared by high-speed mechanical stirring to make the solution uniform as a whole, and the additive hydroxymethyl cellulose is added to the slurry, and the mass content of hydroxymethyl cellulose accounts for 10% of the absolute dry weight of the nanocellulose fibers. Add water to dilute the slurry to a mass concentration of 0.01%. The diluted slurry is dehydrated and formed on the Internet; pressed and dried; hot-rolled at a forming temperature of 110°C and a line pressure of 120kg / cm. Rolling, rewinding, cutting and packaging to prepare composite nanofiber separators for batteries.

[0043] The thickness of the composite nanofiber separator is 50 μm, the porosity is 40%, and the LOI is 65%; the dimensional shrinkage rate ...

Embodiment 3

[0045] A mixture of bacterial cellulose nanofibers, polyvinyl alcohol (low-melting point polymer nanofibers), tris(2,3-dibromopropyl) isocyanurate and ammonium cyanide (flame retardant) obtained by culturing bacterial strains Material) by mass ratio 75%, 20%, 5% into the dispersant deionized water, and then by high-speed mechanical stirring to make the solution reach the uniformity of the whole to prepare the slurry, add the additive chitosan, chitosan The mass content accounts for 10% of the absolute dry weight of the cellulose nanometer cellulose fiber. Add alcohol-water mixture to dilute the slurry to a mass concentration of 0.05%, and dehydrate the diluted slurry on the Internet; press and dry; hot-roll forming at a molding temperature of 110°C and a linear pressure of 120kg / cm , and then through paper rolling, rewinding, slitting and packaging, the composite nanofiber separator for batteries is obtained.

[0046] The thickness of the composite nanofiber separator is 80 μ...

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Abstract

The invention provides a composite nanofiber diaphragm for an electrochemical element, a preparation method and an energy storage device. The diaphragm is prepared from high-temperature-resistant nanofibers, low-melting-point polymer nanofibers and a flame-retardant material through self-assembly crosslinking with a wet-process production method. The diaphragm is 10-80 mu m thick, the porosity is 40%-90%, the size shrinkage rate is 0-5% when the diaphragm is put in the environment with the temperature of 200 DEG C for 30 min, the LOI (limit oxygen index) is 20%-65%, the breathability index Gurley value is 5-300 s / 100cc, the absorption rate of an electrolyte solution is 150%-500%, the mechanical stretching strength is 10-100 MPa. The diaphragm has excellent high-temperature resistance and flame retardancy, the preparation process is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of diaphragms for electrochemical elements, and in particular relates to a high-temperature-resistant flame-retardant diaphragm and a preparation method thereof. The present invention also relates to energy storage devices produced using the separator, including lithium ion batteries, supercapacitors, lead-acid batteries, zinc-air batteries, and sodium ion batteries. Background technique [0002] Lithium batteries have many advantages such as high energy density, high power density and long cycle life, so they have received great attention in the fields of portable electronic devices, power batteries and energy storage batteries. Overcharge, short circuit, thermal shock and mechanical shock during the application of lithium-ion batteries may cause the lithium-ion batteries to catch fire and explode, bringing safety hazards to people's lives and property. In the composition of lithium batteries, the main fun...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M2/18H01M50/40H01M50/403H01M50/406H01M50/417H01M50/42H01M50/426H01M50/429H01M50/44H01M50/443H01M50/491H01M50/494
CPCH01M50/44H01M50/403H01M50/417H01M50/494H01M50/491H01M50/443H01M50/42H01M50/426H01M50/429H01M50/406D04H1/00Y02E60/10
Inventor 张宣宣解明
Owner NINGBO ATMK LITHIUM ION TECH INC
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