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One-sided electrode with reduced twisting for a secondary battery, and method for producing same

A secondary battery and electrode technology, applied in the field of single-sided electrodes and their preparation, can solve problems such as limiting battery performance and increasing costs, and achieve the effects of improving productivity, avoiding curling, and improving work convenience.

Active Publication Date: 2019-10-29
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, techniques such as minimizing the rolling speed, increasing the thickness of the current collector, or reducing the speed of the pressing process have been proposed, but they still have the problem of limiting the performance of the battery or increasing the cost.

Method used

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  • One-sided electrode with reduced twisting for a secondary battery, and method for producing same
  • One-sided electrode with reduced twisting for a secondary battery, and method for producing same
  • One-sided electrode with reduced twisting for a secondary battery, and method for producing same

Examples

Experimental program
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Effect test

Embodiment 1

[0088] A clad metal (8μm+12μm) containing copper and stainless steel was prepared. Thereafter, the electrode paste (by LiNi 0.55 mn 0.30 co 0.15 o 2 , Denka black as a conductive material and polyvinylidene fluoride as a binder were mixed in a weight ratio of 96:2:2 and then NMP was added) were coated on the composite metal to have a thickness of 200 μm. Then, it is dried and rolled to produce a single-sided electrode sheet.

Embodiment 2

[0090] A stainless steel having a thickness of 12 μm was laminated on one side of a copper foil having a thickness of 8 μm as a current collector, and then heat and pressure were applied to form an electrode deformation preventing layer. Then the electrode paste (by LiNi 0.55 mn 0.30 co 0.15 o 2 , Denka black as a conductive material and polyvinylidene fluoride as a binder were mixed in a weight ratio of 96:2:2 and then NMP was added) were coated on the other side of the copper foil to have a thickness of 200 μm. Then, it was dried and rolled to prepare a single-sided electrode sheet.

Embodiment 3

[0092] The polypropylene solution was coated onto a copper foil having a thickness of 8 μm as a current collector to have a thickness of 12 μm, and dried to form an electrode deformation preventing layer. Thereafter, the electrode paste was coated so as to have a thickness of 40 μm, followed by drying and rolling to prepare a single-sided electrode sheet.

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Abstract

The present invention is a one-sided electrode for a secondary battery, comprising: a current collector; an electrode mixture layer applied to one surface of the current collector; and an electrode twisting prevention layer formed on the other surface of the current collector to which an electrode mixture is not applied. The one-sided electrode according to the present invention is an electrode showing significantly reduced twisting or rolling after a rolling process and has the advantages of facilitating operations in a follow-up process and enabling enhanced productivity.

Description

technical field [0001] This application claims the benefit of priority from Korean Patent Application No. 10-2017-0139136 filed on October 25, 2017, and is hereby incorporated by reference in its entirety. [0002] The present invention relates to a single-sided electrode and a preparation method thereof, which improves the phenomenon of electrode deformation or bending caused by differences in current collectors and electrode mixtures during a rolling process when preparing a single-sided electrode. Background technique [0003] As the technology of mobile devices develops and the demand for mobile devices increases, the demand for secondary batteries as energy sources is rapidly increasing. Among such secondary batteries, lithium secondary batteries exhibit high energy density and operating potential, long cycle life, and low self-discharge rate, and have been commercialized and widely used. [0004] In recent years, attention to environmental issues has increased, so ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M10/052
CPCH01M4/13H01M4/139H01M10/052H01M4/661H01M4/667H01M4/668H01M4/70H01M4/0435H01M4/0404Y02E60/10Y02P70/50H01M4/0471H01M4/669H01M10/0525H01M2004/027
Inventor 吴世橒尹汝敬禹先确郑友拉
Owner LG ENERGY SOLUTION LTD
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