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Polymer current collector for lithium ion battery and preparation method of polymer current collector

A lithium-ion battery and polymer technology, applied in battery electrodes, secondary batteries, electrode carriers/collectors, etc., can solve problems such as easy breakage, difficulty in improving battery specific energy, and reduced thickness of copper foil, so as to improve adhesion , weight reduction, internal resistance reduction effect

Pending Publication Date: 2022-05-13
湖南大晶新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ultra-thin copper foil brings new troubles in the processing process, such as easy to break and curl during the lithium battery coating process, so the thickness of the copper foil cannot be reduced all the time, there is a limit
In this way, it is difficult to improve the specific energy of the battery by reducing the weight of the current collector

Method used

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  • Polymer current collector for lithium ion battery and preparation method of polymer current collector

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Embodiment 1

[0025] A polymer current collector for lithium-ion batteries, comprising polyamide fibers with a mass ratio of 96:4, and carbon nanotube-loaded nano-copper conductive agents;

[0026] Wherein, the preparation method of polyamide fiber is as follows:

[0027] Soak the polyamide fibers in NaOH solution at 85°C for 30 minutes, filter out, wash with water, and dry, then immerse in formic acid solution with a volume concentration of 50% for 2 hours, filter out, wash with water, dry, and then add to water. Add the mixed solution composed of hydrochloric acid and aniline monomer, stir for 10 minutes, add 1M ammonium persulfate solution to initiate the reaction, make the aniline monomer in-situ polymerize on the surface of polyamide for 5 hours, filter, wash with water and dry.

[0028] The preparation method of carbon nanotube loaded nano-copper is as follows:

[0029] Drop 0.01mol / L copper nitrate solution with a volume ratio of 1:1 into 0.02mol / L sodium borohydride solution, then ...

Embodiment 2

[0033] A polymer current collector for lithium-ion batteries, comprising polyamide fibers with a mass ratio of 96:4, and carbon nanotube-loaded nano-copper conductive agents;

[0034] The preparation method of carbon nanotube loaded nano-copper is as follows:

[0035] Drop 0.01mol / L copper nitrate solution with a volume ratio of 1:1 into 0.02mol / L sodium borohydride solution, then add carbon nanotubes, adjust the pH of the solution to 12, raise the temperature to 90°C and stir for 2 hours, then filter with suction. Wash the obtained solid with water, dry it under vacuum at 130° C. for 25 hours, then immerse it in a 10 wt % ethanol solution of oleic acid, filter it out and dry it after 10 hours.

[0036] A preparation method of polymer current collector for lithium ion battery:

[0037] Disperse the conductive agent in water to make dispersion A, then add polyamide fibers and disperse in water to make dispersion B, mix and shear dispersion A and dispersion B for 3 hours, then ...

Embodiment 3

[0040] A polymer current collector for lithium-ion batteries, comprising polycarbonate fibers with a mass ratio of 96:4, and carbon nanotube-loaded nano-copper conductive agents;

[0041] The preparation method of carbon nanotube loaded nano-copper is as follows:

[0042] Drop 0.01mol / L copper nitrate solution with a volume ratio of 1:1 into 0.02mol / L sodium borohydride solution, then add carbon nanotubes, adjust the pH of the solution to 12, raise the temperature to 90°C and stir for 2 hours, then filter with suction. Wash the obtained solid with water, dry it under vacuum at 130° C. for 25 hours, then immerse it in a 10 wt % ethanol solution of oleic acid, filter it out and dry it after 10 hours.

[0043] A preparation method of polymer current collector for lithium ion battery:

[0044] Disperse the conductive agent in water to make dispersion A, then add polycarbonate fiber and disperse it in water to make dispersion B, mix and shear dispersion A and dispersion B for 3 ho...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a polymer current collector for a lithium ion battery and a preparation method of the polymer current collector. Compared with a copper foil current collector, the weight of the polymer current collector is reduced by more than 50%, the internal resistance of the polymer current collector is greatly reduced, and due to the fact that the polymer current collector is made of a polymer material, metal burrs cannot be generated in the manufacturing process of a battery pole piece, and the safety of a lithium ion battery is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a polymer current collector for lithium ion batteries and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have gradually become the main source of power for new energy vehicles, and their specific energy determines the cruising range of electric vehicles. Large, reducing the proportion of auxiliary materials such as housings; lightweight housings such as batteries packaged in aluminum-plastic film; reducing the thickness of current collectors and diaphragms, etc. [0003] The positive electrode current collector inside the lithium-ion battery is aluminum foil, and the negative electrode current collector is copper foil. The density of copper is 8.9g / cm 3 . In recent years, the thickness of copper foil for industrialized lithium-ion batteries has gradually decreased from 12 μm to 6 μm. However, in batteries, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/663H01M4/667H01M10/0525
Inventor 宋善林邓哲蔡浩杨琼李继阳陈少君徐鹏段冬冬
Owner 湖南大晶新材料有限公司
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