Copolymide nano-fiber non-woven fabric, process for producing the same and the use thereof

Inactive Publication Date: 2013-08-01
JIANGXI XIAN CAI NANOFIBERS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a new type of copolyimide that can be used to make a non-woven fabric for use as a battery membrane. This fabric has unique properties that make it better than other materials currently on the market. The technical effects of this new invention include improved performance and efficiency of batteries.

Problems solved by technology

Currently, the battery membrane of polyethylene (PE), polypropylene (PP), etc., used in battery industry cannot ensure the integrity thereof under a relatively high temperature due to a low melting temperature and an over-high heat shrink ratio, thus leading to breakage of the battery membrane due to thermal shrinkage even melting, under the conditions of overheat, overcharge, etc., and resulting in serious accidents, such as thermal runaway and explosion, due to the internal short circuit of batteries.

Method used

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  • Copolymide nano-fiber non-woven fabric, process for producing the same and the use thereof
  • Copolymide nano-fiber non-woven fabric, process for producing the same and the use thereof
  • Copolymide nano-fiber non-woven fabric, process for producing the same and the use thereof

Examples

Experimental program
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Effect test

embodiment 1

[0032]One tetracid dianhydride monomer and two diamine monomers were selected as the comonomers. Purified biphenyl dianhydride (BPDA), p-phenylenediamine (PPD) and oxydianiline (ODA) were mixed at a molar ratio of 1:0.5:0.5, and reacted in N,N-dimethyl formamide (DMF) as a solvent following the above steps. In reaction step (1), the temperature of the reaction kettle of the example is 10° C., the time of the reaction under agitation is 6 h, and the electric field intensity of the high voltage electric field for the electrostatic spinning is 300 Kv / m; and in reaction step (2), the temperature rise program includes heating from room temperature to 200° C. at a temperature rise rate of 20° C. / min, and maintaining at the temperature for 30 min, heating to 350° C. at a temperature rise rate of 5° C. / min, and maintaining at 350° C. for 30 min, shutting off the power source, and naturally cooling to room temperature.

[0033]Property characterization: the mass concentration of the copolyamic ...

embodiment 2

[0034]One tetracid dianhydride monomer and two diamine monomers were selected as the comonomers. Purified pyromellitic dianhydride (PMDA), oxydianiline (ODA) and Benzidine (Bz) were mixed at a molar ratio of 1:0.6:0.4, and reacted in N,N-dimethyl formamide (DMF) as a solvent following the above steps; in reaction step (1), the temperature of the reaction kettle of the example is 5° C., the time of the reaction under agitation is 6 h, and the electric field intensity of the high voltage electric field for the electrostatic spinning is 250 Kv / m; and in reaction step (2), the temperature rise program includes heating from room temperature to 250° C. at a temperature rise rate of 20° C. / min, and maintaining at the temperature for 30 min, heating to 370° C. at a temperature rise rate of 5° C. / min, and maintaining at 370° C. for 30 min, shutting off the power source, and naturally cooling to room temperature.

[0035]Property characterization: the mass concentration of the copolyamic acid (p...

embodiment 3

[0036]One tetracid dianhydride monomer and two diamine monomers were selected as the comonomers. Purified pyromellitic dianhydride (PMDA), methylene dianiline (MDA) and oxydianiline (ODA) were mixed at a molar ratio of 1:0.5:0.5, and reacted in N,N-dimethyl formamide (DMF) as a solvent following the above steps; in reaction step (1), the temperature of the reaction kettle of the example is 5° C., the time of the reaction under agitation is 10 h, and the electric field intensity of the high voltage electric field for the electrostatic spinning is 250 Kv / m; and in reaction step (2), the temperature rise program includes heating from room temperature to 250° C. at a temperature rise rate of 20° C. / min, and maintaining at the temperature for 30 min, heating to 370° C. at a temperature rise rate of 5° C. / min, and maintaining at 370° C. for 30 min, shutting off the power source, and naturally cooling to room temperature.

[0037]Property characterization: the mass concentration of the copoly...

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Abstract

A copolyimide nano-fiber non-woven fabric, a process for producing the same and the use thereof. The process comprises the following steps: tetracid dianhydride monomer and diamine monomer are polycondensated in the reaction medium of a high polar solvent under mechanical agitation to form a solution of a copolyamic acid; the copolyamic acid solution is electrostatically spinned under a high voltage electric field to give a non-woven fabric of a nano-fiber of the copolyamic acid; and then the non-woven fabric is imidized. The copolyimide nano-fiber non-woven fabric has features of a strong tear resistance, a high porosity, high / low-temperature resistances and excellent mechanical properties, etc., and can be used in battery membrane and capacitor membrane.

Description

SUMMARY OF THE UTILITY MODEL[0001]The present invention relates to a copolyimide, a process for producing the same and the use thereof, and in particular to a copolyimide nano-fiber non-woven fabric, a process for producing the same and the use thereof as battery membrane.BACKGROUND ART[0002]Chemical power source is an extremely important part of modern life, and products, such as mobile phone batteries, automobile power batteries in development, etc., are indispensable for human to pursue high quality life. The safety of the batteries is important scientific and technological issues and social responsibility issue concerned by human, and the development of safe battery membranes is a technology key to solve the battery safety issues. Currently, the battery membrane of polyethylene (PE), polypropylene (PP), etc., used in battery industry cannot ensure the integrity thereof under a relatively high temperature due to a low melting temperature and an over-high heat shrink ratio, thus l...

Claims

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Application Information

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IPC IPC(8): D04H1/00H01M50/414H01M50/489H01M50/491H01M50/494
CPCC08G73/10C08G73/1042D01F6/74D01F6/78D04H1/00D04H1/728D04H3/009D04H3/016H01M2/162D04H1/4326Y10T442/60Y02E60/10H01M50/44H01M50/414H01M50/491H01M50/489H01M50/494
Inventor HOU, HAOQINGCHENG, CHUYUNCHEN, SHUILIANGZHOU, XIAOPINGLV, XIAOYIHE, PINGKUANG, XIAOMINGREN, JINSHENG
Owner JIANGXI XIAN CAI NANOFIBERS TECH
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