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A kind of flexible current collector for lithium battery and preparation method thereof

A technology of flexible current collectors and lithium batteries, which is applied in the direction of battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of poor electrical conductivity of flexible current collectors, achieve enhanced mechanical processability, reduce loss, and reduce quality effect of density

Active Publication Date: 2021-03-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrical conductivity of the flexible current collector is not good

Method used

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  • A kind of flexible current collector for lithium battery and preparation method thereof
  • A kind of flexible current collector for lithium battery and preparation method thereof
  • A kind of flexible current collector for lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Select a polyethylene terephthalate (PET) film with a thickness of 3.8 μm, first spray and clean it with acetone for 3 minutes, then clean it with alcohol in an ultrasonic water bath for 10 minutes, and then pass ultraviolet light on it. The surface of the film is cleaned and activated;

[0050] (2) Put the cleaned and activated PET film and industrial-grade pure copper substrate into the roll-to-roll vacuum evaporation equipment, debug the program, and prepare for evaporation; set the evaporation vacuum environment and process parameters, and vacuum the vacuum device to 1×10 -4 When the Pa is below, turn on the vacuum coating, set the voltage to 380V, the current to 50A, and the coating rate to ~60cm / min; execute the program to conduct evaporation, and the single layer thickness of the copper coating reaches 1μm;

[0051] (3) the film after copper plating is placed on the coating machine again, and the coating film rate is set to be ~ 2m / min, and the feed rate is ...

Embodiment 2

[0054] (1) Select a PET film with a thickness of 3.8 μm, spray it with acetone for 3 minutes, then wash it with alcohol in an ultrasonic water bath for 10 minutes, and then use ultraviolet light to clean and activate the surface of the film;

[0055] (2) Put the cleaned and activated PET film and industrial-grade pure aluminum substrate into the roll-to-roll vacuum evaporation equipment, debug the program, and prepare for evaporation; set the evaporation vacuum environment and process parameters, and vacuum the vacuum device to 1×10 -4 When the Pa is below, turn on the vacuum coating, set the voltage to 380V, the current to 50A, and the coating rate to ~100cm / min; execute the program to conduct evaporation, and the thickness of the single layer of copper coating reaches 1.8μm;

[0056] (3) the film after copper plating is placed on the coating machine again, and the coating film rate is set to be ~ 2m / min, and the feed rate is 5g / min, and the carbon nanotube (CNT ) / N-methylpy...

Embodiment 3

[0069] (1) Select a polypropylene (PP) film with a thickness of 1 μm, first spray and clean it with acetone for ~3 minutes, then clean it with alcohol in an ultrasonic water bath for ~10 minutes, and then clean and activate the surface of the film by ultraviolet light;

[0070] (2) Place the cleaned and activated PP film and industrial-grade pure copper substrate into the roll-to-roll vacuum evaporation equipment, debug the program, and prepare for evaporation; set the evaporation vacuum environment and process parameters, and vacuum the vacuum device to 1×10 -4 When the Pa is below, turn on the vacuum coating, set the voltage to 380V, the current to 50A, and the coating rate to 120cm / min; execute the program to conduct evaporation, and the single layer thickness of the copper coating reaches 0.1μm;

[0071] (3) the film after copper plating is placed on the coating machine again, and the coating film rate is set to be ~ 2m / min, and the feed rate is 5g / min, and the graphene / N-...

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Abstract

The invention discloses a flexible current collector for lithium batteries and a preparation method thereof, wherein the flexible current collector includes a flexible base layer, a metal conductive plating layer and a conductive anti-oxidation layer that are closely combined in sequence; the flexible base layer is made of polyethylene One of vinyl chloride, polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polydimethylsiloxane and polyimide, the thickness of the flexible base layer is 1 ~20 μm; the conductive metal coating is one of Cu, Al, Ni, Au and Ag, and the thickness of the conductive metal coating is 0.1 ~ 5 μm; the conductive anti-oxidation layer includes conductive graphite, graphene , at least one of carbon nanotubes and carbon nanofibers, the thickness of the conductive anti-oxidation layer is greater than 0 and less than 1 μm. The flexible current collector of the present invention has strong mechanical processability, strong thermal stability and anti-oxidation energy, and its overall mass density is small.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a flexible current collector for lithium batteries and a preparation method thereof. Background technique [0002] Due to its high energy density, good reliability and excellent environmental performance, lithium batteries have become one of the most important energy storage devices in the market and are widely used in portable electronic products such as digital cameras, mobile phones and notebook computers. [0003] With the recent rise and rapid development of electric vehicles, the energy density and stability of lithium-ion batteries have been further improved and improved. The main structure of lithium-ion batteries manufactured today is stacked or wound positive plates, diaphragms, and negative plates. The diaphragm insulates the positive and negative electrodes, and the electrolyte infiltrated into it ensures the conduction of lithium ions between the positi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66
CPCH01M4/667Y02E60/10
Inventor 吴永志汪小知傅杰聂赞相沃华蕾徐天白
Owner ZHEJIANG UNIV
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