A high-temperature-resistant polyarylsulfone amide-based lithium-ion battery separator

A polyarylsulfone amide-based, lithium-ion battery technology is applied in the preparation of the above-mentioned polyarylsulfone amide-based nanofiber membrane, and the application field of the above-mentioned polyarylsulfone amide-based nanofiber membrane in lithium ion batteries achieves pore structure distribution. Uniformity, excellent flame retardant performance and convenient preparation

Active Publication Date: 2016-08-17
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 lithium-ion battery separator materials has not been reported so far

Method used

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  • A high-temperature-resistant polyarylsulfone amide-based lithium-ion battery separator
  • A high-temperature-resistant polyarylsulfone amide-based lithium-ion battery separator
  • A high-temperature-resistant polyarylsulfone amide-based lithium-ion battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 30 g of N,N-dimethylacetamide and 4.88 g of polyarylsulfoneamide into a 100 ml reagent bottle, then stir at room temperature for 6 h to obtain a homogeneous solution of polyarylsulfoneamide (mass fraction: 14 % ). Another 1.0 ml polyarylsulfone amide solution was taken out for electrospinning, the needle diameter was 1.6 mm, the spinning voltage was 35 kV, the height from the needle tip to the receiving plate was 12 cm, and the electrospinning time was 3 h, the thickness of 60 μm was obtained. Polyarylsulfonamide nanofibrous membrane. Then the membrane was placed in a roller press with a pressure of 13 MPa for 2 min to obtain a polyarylsulfonamide nanofiber membrane with a thickness of 30 μm.

Embodiment 2

[0032] Add 4.88 g of polyarylsulfoneamide and 10 g of polyvinylidene fluoride-hexafluoropropylene into a 100 ml reagent bottle, then add 30 g of N,N-dimethylacetamide, and then stir at room temperature. The time was 6 h, and a homogeneous solution of polyarylsulfone amide (mass fraction 14 %) and polyvinylidene fluoride-hexafluoropropylene solution (mass fraction 25 %) was obtained. Another 2 ml of polyarylsulfone amide solution and 2 ml of polyvinylidene fluoride-hexafluoropropylene solution were taken out for coaxial electrospinning, the diameter of the needle was 0.34 mm, the flow rate of spinning solution was 0.08 ml / h, and the spinning voltage was 28 kV, the height from the needle tip to the receiving plate was 12 cm, and the electrospinning time was 5 h, 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 for 2 min to obtain a ...

Embodiment 3

[0034]Add 30 g dimethyl sulfoxide, 5.3 g polyarylsulfone amide and 0.05 g nanometer silicon dioxide into a 100 ml reagent bottle, then stir at room temperature for 8 h to obtain a uniform polyarylsulfone amide / Nano silica solution (mass fraction is 27%). Another 2 ml of polyarylsulfonamide / nano-silica solution was taken out for electrospinning. The needle diameter was 1.6 mm, the spinning voltage was 20 kV, the height from the needle tip to the receiving plate was 12 cm, and the electrospinning time was 4 h. A polyarylsulfonamide / nano-silica nanofiber membrane with a thickness of 80 μm was obtained. Then the membrane was placed in a roller press with a pressure of 8 MPa 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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16D04H1/728D01D5/00
CPCY02E60/10
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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