High-temperature resistant aromatic polysulfonamide base lithium ion battery diaphragm

A polyarylsulfone amide-based, lithium-ion battery technology is applied to the application of the above-mentioned polyarylsulfone amide-based nanofiber membrane in lithium ion batteries, and the field of preparation of the above-mentioned polyarylsulfone amide-based nanofiber membrane can achieve heat resistance. Good, excellent flame retardant performance, uniform distribution of pore structure

Active Publication Date: 2013-03-13
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of polyarylsulfone amide-based fiber membranes as lithi

Method used

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  • High-temperature resistant aromatic polysulfonamide base lithium ion battery diaphragm
  • High-temperature resistant aromatic polysulfonamide base lithium ion battery diaphragm
  • High-temperature resistant aromatic polysulfonamide base lithium ion battery diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Add 30g of N,N-dimethylacetamide and 4.88g of polyarylsulfoneamide into a 100ml reagent bottle, and then stir at room temperature for 6h to obtain a uniform polyarylsulfoneamide solution (mass fraction: 14%). Another 1.0ml polyarylsulfone amide solution was taken out for electrospinning, the needle diameter was 1.6mm, the spinning voltage was 35kV, the height from the needle tip to the receiving plate was 12cm, the electrospinning time was 3h, and polyarylsulfone with a thickness of 60μm was obtained. Amide nanofiber membrane. Then the membrane was placed in a roller press with a pressure of 13 MPa to stay for 2 minutes to obtain a polyarylsulfonamide nanofiber membrane with a thickness of 30 μm.

Embodiment 2

[0030] Add 4.88g of polyarylsulfoneamide and 10g of polyvinylidene fluoride-hexafluoropropylene into a 100ml reagent bottle, then add 30g of N,N-dimethylacetamide, and then stir at room temperature for 6h , to obtain a uniform polyarylsulfone amide solution (mass fraction is 14%) and polyvinylidene fluoride-hexafluoropropylene solution (mass fraction is 25%). In addition, 2ml of polyarylsulfoneamide solution and 2ml of polyvinylidene fluoride-hexafluoropropylene solution were taken out for coaxial electrospinning, the needle diameter was 0.34mm, the flow rate of spinning solution was 0.08ml / h, and the spinning voltage was 28kV. The height from the needle tip to the receiving plate was 12 cm, the electrospinning time was 5 h, and a polyarylsulfoneamide polyvinylidene fluoride-hexafluoropropylene nanofiber membrane with a thickness of 70 μm was obtained. Then the membrane was placed in a roller press with a pressure of 5 MPa to stay for 2 minutes to obtain a polyarylsulfoneamide...

Embodiment 3

[0032] Add 30g of dimethyl sulfoxide, 5.3g of polyarylsulfoneamide and 0.05g of nano silicon dioxide into a 100ml reagent bottle, then stir at room temperature for 8h to obtain a uniform polyarylsulfoneamide / nanometer silica Silicon solution (mass fraction is 27%). Another 2ml of polyarylsulfoneamide / nano-silica solution was taken out for electrospinning, the needle diameter was 1.6mm, the spinning voltage was 20kV, the height from the needle tip to the receiving plate was 12cm, the electrospinning time was 4h, and the obtained thickness was 80μm Polyarylsulfonamide / nanosilica nanofiber membrane. Then the membrane was placed in a roller press with a pressure of 8 MPa to stay for 2 minutes to obtain a polyarylsulfoneamide / nanometer silicon dioxide nanofiber membrane with a thickness of 50 μm.

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Abstract

The invention belongs to the technical field of lithium ion battery diaphragm, and provides a high-temperature resistant aromatic polysulfonamide base lithium ion battery diaphragm. The battery diaphragm is characterized in that the battery diaphragm has fiber diameter of 30-800nm, diaphragm thickness of 15-80 mum and membrane permeability of 3-100 s; pores on the upper and lower surface of the membrane and in the membrane are symmetrically and uniformly distributed, and have average pore size of 50-800nm; besides, the membrane has porosity of 70%-90%, and tensile strength of 10-50 MPa. The invention also discloses a preparation method of the aromatic polysulfonamide base diaphragm. Compared with a traditional polyolefin diaphragm, the aromatic polysulfonamide base diaphragm provided by the invention has good electrolyte wettability, excellent flame retardant performance and high temperature resistance performance. A lithium ion battery assembled from the diaphragm does not generate short circuit phenomenon under high temperature of 120 DEG C, and can charge and discharge quickly. Therefore, the high-temperature battery diaphragm provided by the invention is particularly applicable to the fields of power lithium ion battery and high temperature lithium ion battery.

Description

technical field [0001] The invention relates to a polyaryl sulfone amide-based nanofiber membrane. [0002] The present invention also relates to a preparation method of the polyarylsulfone amide-based nanofiber membrane. [0003] The present invention also relates to the application of the polyarylsulfone amide-based nanofiber membrane in lithium ion batteries. Background technique [0004] Lithium-ion batteries have the advantages of high specific energy, fast charging and discharging, no memory effect, long cycle life, safety and reliability, and wide operating temperature range. Therefore, they have received great attention and development in the fields of portable electronic devices and electric vehicles. Lithium-ion batteries are mainly composed of three parts: positive electrode material, negative electrode material and separator. The cost of the separator accounts for about 20% of the total cost of the battery and is an important part of the lithium-ion battery. T...

Claims

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Application Information

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IPC IPC(8): H01M2/16D04H1/728D01D5/00
CPCY02E60/12Y02E60/10
Inventor 崔光磊张建军孔庆山岳丽萍刘志宏姚建华
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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