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Method of preparing flexible battery and flexible battery prepared therefrom

A flexible battery, manufacturing method technology, applied in secondary battery manufacturing, small flat battery/battery, large flat battery/battery, etc., to achieve the effects of improving bonding strength, increasing capacity retention rate, and reducing resistance

Active Publication Date: 2020-02-07
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present disclosure aims to solve the problems of the related art, so the present disclosure aims to provide a flexible battery that makes it easy to design tabs

Method used

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  • Method of preparing flexible battery and flexible battery prepared therefrom
  • Method of preparing flexible battery and flexible battery prepared therefrom
  • Method of preparing flexible battery and flexible battery prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] like Figure 2a As shown in , a current collector (thickness: 20 μm) made of Al and having an annular current collecting portion with a single through hole and a tab connection portion was prepared. Here, the area of ​​the current collecting portion excluding the via holes was 20% of the total area of ​​the current collecting portion. The tab connection of the current collector is masked with a mask made of polyimide material.

[0081] On the other hand, 50 parts by weight of LiCoO as an active material 2 20 parts by weight of carbon black as a conductive material and 30 parts by weight of polyacrylonitrile (PAN) as a binder were added to 150 parts by weight of dimethylformamide (DMF) as a solvent to obtain a positive electrode slurry.

[0082] The slurry was introduced into an electrospinning nozzle controlled at a temperature of 25 °C, and a voltage of 1.5 kV was applied between the electrospinning nozzle and a shielded current collector to perform electrospinning, ...

Embodiment 2

[0086] A lithium secondary battery was obtained in the same manner as in Example 1, except that an Al current collector (thickness: 20 μm) comprising a ring-shaped current collecting portion with a single through hole and a tab connection portion, and the area of ​​the current collecting portion excluding the through hole is 4% of the total area of ​​the current collecting portion; and using a Cu current collector (thickness: 20 μm) as the negative electrode current collector, the Cu current collector An annular current collecting portion provided with a single through hole and a tab connection portion are included, and the area of ​​the current collecting portion excluding the through hole is 4% of the total area of ​​the current collecting portion.

Embodiment 3

[0088] A lithium secondary battery was obtained in the same manner as in Example 1, except that an Al current collector (thickness: 20 μm) comprising a ring-shaped current collecting portion with a single through hole and tab connection portion, and the area of ​​the current collecting portion excluding the through hole is 85% of the total area of ​​the current collecting portion; and using a Cu current collector (thickness: 20 μm) as the negative electrode current collector, the Cu current collector An annular current collecting portion with a single through hole and a tab connection portion are included, and the area of ​​the current collecting portion excluding the through hole is 85% of the total area of ​​the current collecting portion.

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Abstract

A method for manufacturing a flexible battery and a flexible battery manufactured therefrom are disclosed. The method comprises the steps of: preparing a current collector of an electrode having a current collecting unit having at least one through hole and a tab connecting unit extending from an edge of the current collecting unit and connected to the tab; forming an electrode active material layer on at least one surface of the electrode current collector by electro-spinning electrode slurry including an electrode active material, a binder, a conductive material, and a solvent over at leastone surface of the edge of the current collecting unit and through holes; and forming a battery including the electrode current collector having the electrode active material layer formed thereon as an electrode.

Description

technical field [0001] The present disclosure relates to a method for manufacturing a flexible battery, in particular, a method for manufacturing a flexible battery that makes it easy to design tabs, and the resulting flexible battery. [0002] This application claims priority from Korean Patent Application No. 10-2017-0112720 filed in Korea on September 4, 2017, the disclosure of which is incorporated herein by reference. Background technique [0003] With the technological development and increase in demand for mobile devices, there has been an increasing demand for rechargeable secondary batteries that can be downsized and have high capacity. In addition, among such secondary batteries, lithium secondary batteries having high energy density and voltage have been commercialized and widely used. [0004] In general, a lithium secondary battery is provided with an electrode assembly including a positive electrode and a negative electrode formed by applying an active materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M10/0585H01M4/72H01M4/74H01M4/66H01M2/26H01M4/04H01M50/531
CPCH01M4/72Y02E60/10Y02P70/50H01M50/105H01M50/136H01M50/178H01M4/0404H01M4/0438H01M50/531H01M10/0436H01M10/0585H01M4/74H01M4/66H01M10/0413H01M4/70H01M50/54H01M4/0411H01M10/052
Inventor 李廷弼严仁晟
Owner LG ENERGY SOLUTION LTD