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Ultrathin foil transferring and processing method capable of reducing curling of ultrathin foil and preventing folding thereof

An ultra-thin, thin foil technology, applied in thin material processing, winding/folding electrodes, winding strips, etc., can solve problems such as sheet bending, prevent ultra-thin foil folding, and improve ultra-thin foil bending phenomenon , the effect of reducing the failure rate

Active Publication Date: 2020-11-20
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this equipment, when the sheet extracted from the electrode roller and contact roller is subjected to subsequent conveying or rolling processing, there is still a possibility of sheet bending phenomenon

Method used

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  • Ultrathin foil transferring and processing method capable of reducing curling of ultrathin foil and preventing folding thereof
  • Ultrathin foil transferring and processing method capable of reducing curling of ultrathin foil and preventing folding thereof
  • Ultrathin foil transferring and processing method capable of reducing curling of ultrathin foil and preventing folding thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] Electrode Preparation (Example)

[0126] Using copper foil with a width of 1000 mm and a thickness of 10 μm as an ultra-thin foil of an electrode collector, a cylindrical hard rubber with a width of 50 mm was processed and mounted on both ends of a roller used in the electrode manufacturing process. In addition, a non-conductive tape made of Teflon for induction electrification was attached to both ends of the ultrathin foil.

[0127] In addition, in conveyance of the ultrathin foil, a positively charged nickel electrode is provided on the inner surface of the curved surface formed on the ultrathin foil along the conveyance direction. The charged body is placed at a distance of 20mm from the ultra-thin foil.

[0128] Add 95% by weight of carbon mixture (electrode active material), 2.5% by weight of Super-C (conductive agent) and 2.5% by weight of SBR (binder) to CMC (Carboxymethylcellulose, carboxymethylcellulose, water solvent ) and distilled water in a mixed solutio...

Embodiment 2

[0130] Preparation of separator (example)

[0131] A coating with a thickness of about 0.3 μm was formed by a dip coating method, and a polyolefin-based porous separator (Celgard TM , three-layer polyolefin-based separator) was passed through a solution in which about 4% by weight of PVDF was added to acetone as a solvent.

[0132] In this process, a cylindrical hard rubber having a width of 50 mm is mounted on both ends of the guide roller. In addition, in conveyance of the ultrathin foil, a positively charged nickel electrode is provided on the inner surface of the curved surface formed on the ultrathin foil along the conveyance direction. The charged body is placed at a distance of 20mm from the ultra-thin foil.

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Abstract

The present invention relates to an ultrathin foil transferring and processing process for reducing curling and preventing folding of an ultrathin foil which may occur in the ultrathin foil transferring and processing process, and comprises: a step of coating or mounting an electrostatic-inducing material on both ends of a roll to form a charging part; a charging step of rubbing an ultrathin foiland the roll during the transferring and rolling of the ultrathin foil, to charge both ends of the ultrathin foil and the roll with positive or negative charges; and an electrostatic force applying step in which an electrostatic force is applied to both ends of the ultrathin foil simultaneously with or after the charging step and thus the curling of the ultrathin foil is reduced.

Description

technical field [0001] The present invention relates to an ultra-thin foil transfer and handling method for a secondary battery using a roll-to-roll process, and is a method of preventing a folding phenomenon due to bending of the ultra-thin foil during handling. [0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0123011 filed on October 16, 2018, the entire contents of which are hereby incorporated by reference. Background technique [0003] The latest trends in the electronics industry can be summarized as devices and wireless, mobile trends, and the transition from analog to digital. Representative examples include the rapid spread of wireless phones (mobile phones) and notebook computers, and the transition from analog cameras to digital cameras. [0004] In addition to these trends, research and development on secondary batteries serving as operating power sources of devices has also been actively carried out. In pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04B65H23/26B05C9/12B05C1/08
CPCH01M4/04Y02E60/10H01M10/0587H01M10/0431Y02P70/50B05C1/08H01M4/0435H01M4/66H01M4/70
Inventor 文载元韩亨锡庾亨均彭纪熏
Owner LG ENERGY SOLUTION LTD
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