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Lithium ion battery separator for new energy automobile and preparation method thereof

A technology for lithium-ion batteries and new energy vehicles, which is applied in the direction of batteries, secondary batteries, battery pack components, etc., and can solve problems such as large thermal shrinkage of the diaphragm, direct contact between positive and negative electrodes, and short circuits

Inactive Publication Date: 2018-09-14
胡金友
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing lithium-ion battery separators have technical problems such as short circuit caused by direct contact of positive and negative electrodes or easy penetration by lithium dendrites due to too large pore size and increased resistance due to too small pore size. When it is high, the thermal shrinkage rate of the diaphragm is relatively large, and the shrinkage of the diaphragm causes direct contact between the positive and negative electrodes, which is prone to short circuit technical problems

Method used

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  • Lithium ion battery separator for new energy automobile and preparation method thereof
  • Lithium ion battery separator for new energy automobile and preparation method thereof
  • Lithium ion battery separator for new energy automobile and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Mix 30-50 parts by mass of polyethylene and 30 parts by mass of polypropylene with 5 parts by mass of lithium phosphate and 3 parts by mass of lithium sulfonate, and add 1 part by mass of n-stearyl alcohol and 2 Parts by mass of triphenyl phosphite were uniformly mixed in a high-speed mixing mixer, the stirring speed of high-speed mixing was 250r / min, the temperature was 260°C, and the time was 80min to obtain a mixed solution;

[0054] (2) Add the mixed liquid prepared in step (1) into the internal mixer, heat it with heat transfer oil at a temperature of 350°C, pressurize it through the top bolt, and enter the open mixer driven by the hydraulic system after mastication. After being fully plasticized by the strong extrusion and shearing action of the milling roller; then it enters the inverted L-shaped four-roller calender, and the film wrapped on the lower roller of the calender is peeled off and pulled out. The roller speed of the calender is 150mm / s, being drag...

Embodiment 2

[0074] (1) Mix 40 parts by mass of polyethylene and 40 parts by mass of polypropylene with 6 parts by mass of lithium phosphate and 4 parts by mass of lithium sulfonate, and add 1 part by mass of n-stearyl alcohol and 3 parts by mass of The triphenyl phosphite was uniformly mixed in a high-speed mixing mixer, the stirring speed of the high-speed mixing was 260r / min, the temperature was 265°C, and the time was 90min to obtain a mixed solution;

[0075] (2) Put the mixed solution prepared in step (1) into the internal mixer, heat it with heat-conducting oil at a temperature of 380°C, pressurize it through the top bolt, and enter the open mixer driven by the hydraulic system after mastication. After being fully plasticized by the strong extrusion and shearing action of the milling roller; then it enters the inverted L-shaped four-roller calender, and the film wrapped on the lower roller of the calender is peeled off and pulled out. The roller speed of the calender is 180mm / s, be...

Embodiment 3

[0096] (1) Mix 50 parts by mass of polyethylene and 50 parts by mass of polypropylene with 8 parts by mass of lithium phosphate and 5 parts by mass of lithium sulfonate, and add 2 parts by mass of n-stearyl alcohol and 4 parts by mass of The triphenyl phosphite was uniformly mixed in a high-speed mixing mixer, the stirring speed of the high-speed mixing was 280r / min, the temperature was 270°C, and the time was 100min to obtain a mixed solution;

[0097] (2) Add the mixed liquid prepared in step (1) into the internal mixer, heat it with heat transfer oil at a temperature of 400°C, and pressurize it through the top bolt, and enter the open mixer driven by the hydraulic system after mastication. After being fully plasticized by the strong extrusion and shearing action of the milling roller; then it enters the inverted L-shaped four-roller calender, and the film wrapped on the lower roller of the calender is peeled off and pulled out. The roller speed of the calender is 200mm / s, ...

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Abstract

The invention discloses a lithium ion battery separator for a new energy automobile, the lithium ion battery separator comprises a modified non-woven material separator, wherein the surfaces of both sides of the modified non-woven material separator are coated with a modified ceramic coating, and the modified non-woven material separator includes the following materials: polyethylene, polypropylene, lithium phosphate, lithium sulfonate, n-octadecyl alcohol, triphenyl phosphite, acetone, tetrahydrofuran, deionized water, 4,4-diaminodiphenyl ether, N, N-dimethyl acetamide and pyromellitic dianhydride; the invention also discloses a preparation method of the lithium ion battery separator for the new energy automobile. The preparation method solves the technical problems that when the existinglithium ion battery separator has a large pore diameter, positive and negative electrodes are easy to directly contact or easily pierced by lithium dendrites to cause short circuit, when the existinglithium ion battery separator has a too small pore diameter, electrical resistance is increased, and when temperature is raised, the heat shrinkage rate of the separator is large, and the shrinkage of the separator causes direct contact between the positive and negative electrodes, so that the short circuit is prone to occur.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a lithium-ion battery separator for new energy vehicles and a preparation method thereof. Background technique [0002] New energy vehicles refer to vehicles that use unconventional vehicle fuels as power sources, integrate advanced technologies in vehicle power control and drive, and form vehicles with advanced technical principles, new technologies, and new structures. The power supply of new energy vehicles mainly includes lithium-ion batteries, nickel-metal hydride batteries, fuel cells, lead-acid batteries, and supercapacitors. Among them, lithium-ion batteries have high energy density, high voltage, no pollution, no metal lithium, and cycle life. High, no memory effect and fast charging and other technical advantages, it is used as the main choice of power supply for new energy vehicles. [0003] In the structure of lithium batteries, the separator is one of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434H01M50/446H01M50/449H01M50/489H01M50/491
CPCH01M10/0525H01M2220/20H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10H01G11/52
Inventor 张林
Owner 胡金友
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