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A kind of polysulfone nanofiber separator for lithium battery and preparation method thereof

A technology of nanofibers and lithium batteries, which is applied in the field of separators for lithium batteries and their preparation, polysulfone nanofiber separators for lithium batteries and their preparations, can solve the problems of poor uniformity and limited porosity of battery separators, and achieve uniform film formation Good performance, improved porosity, and good uniformity

Active Publication Date: 2015-08-26
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention aims to solve the problems of poor uniformity and limited porosity of battery separators in the prior art, and provides a polysulfone nanofiber separator for lithium batteries, which has strong tear resistance, high porosity, high and low temperature resistance and mechanical properties excellent

Method used

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Embodiment 1

[0027] A polysulfone nanofiber diaphragm for a lithium battery. The polysulfone nanofiber diaphragm for a lithium battery is made by dissolving one or a plurality of polysulfones in any proportion in a polar organic solvent, and then electrospinning. The polysulfone nanofiber separator for lithium batteries described above has a thickness of 10 μm, a diameter of 100 nm, an elongation at break of 15%, a thermal decomposition temperature of 250°C, a porosity of 20%, a mechanical tensile strength of 15 MPa, and an electrical breakdown strength of 1×10 7 V / m.

Embodiment 2

[0029] A polysulfone nanofiber diaphragm for a lithium battery. The polysulfone nanofiber diaphragm for a lithium battery is made by dissolving one or a plurality of polysulfones in any proportion in a polar organic solvent, and then electrospinning. The polysulfone nanofiber separator for lithium batteries described above has a thickness of 50 μm, a diameter of 300 nm, an elongation at break of 25%, a thermal decomposition temperature of 350°C, a porosity of 90%, a mechanical tensile strength of 20 MPa, and an electrical breakdown strength of 1.5×10 7 V / m.

Embodiment 3

[0031] A polysulfone nanofiber diaphragm for a lithium battery. The polysulfone nanofiber diaphragm for a lithium battery is made by dissolving one or a plurality of polysulfones in any proportion in a polar organic solvent, and then electrospinning. The polysulfone nanofiber separator for lithium batteries described above has a thickness of 30 μm, a diameter of 200 nm, an elongation at break of 20%, a thermal decomposition temperature of 300 °C, a porosity of 55%, a mechanical tensile strength of 17.5 MPa, and an electrical breakdown strength of 1.25× 10 7 V / m.

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Abstract

The invention relates to a polysulfone nano-fiber diaphragm for a lithium battery and a preparation method of the polysulfone nano-fiber diaphragm, and belongs to the technical field of lithium battery diaphragms. The polysulfone nano-fiber diaphragm for the lithium battery is prepared by the steps of dissolving one or more polysulfones with any proportion in a polar organic solvent and then performing electrostatic spinning. The polysulfone nano-fiber diaphragm is characterized in that the thickness is 10-50Mum, the diameter is 100-300nm, the elongation at break is 15-25%, the thermal decomposition temperature is 250-350 DEG C, the porosity is 20-90%, the mechanical tensile strength is 15-20MPa, and the electric breakdown strength is 1*107-1.5*107v / m. The polysulfone nano-fiber diaphragm for the lithium battery has the advantages of resisting to tearing, thermal contraction, high temperature and high-voltage large-current overcharge (electricity), and also has good homogeneity and high porosity.

Description

technical field [0001] The invention relates to a diaphragm for lithium batteries and a preparation method thereof. Specifically, the invention relates to a polysulfone nanofiber diaphragm for lithium batteries and a preparation method thereof, belonging to the technical field of diaphragms for lithium batteries. Background technique [0002] In the structure of lithium batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. Separator is a high value-added material with the highest technical barrier among lithium battery materials, accounting for about 20%-30% of the cost of lithium batteries. The main reason for the high price of diaphragms is that some key technologi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 王睿王荣贵吴仕明胡蕴成
Owner DONGFANG ELECTRIC CORP LTD
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