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Electrolytic copper foil having heat resistance and lithium ion secondary battery comprising same

An electrolytic copper foil, a secondary technology, applied in the direction of secondary batteries, electrolyte battery manufacturing, non-aqueous electrolyte batteries, etc., can solve the problems of tabs falling off, unable to provide sufficient protection for copper foil, high current resistance, etc., to achieve excellent The effect of heat resistance

Pending Publication Date: 2021-05-04
CHANG CHUN PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the copper foil usually includes an anti-rust layer such as a chrome layer, in some cases this does not provide sufficient protection to the copper foil
Oxidation of copper is a defect that can cause mechanical and electrical failures, such as tab detachment and higher current resistance

Method used

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  • Electrolytic copper foil having heat resistance and lithium ion secondary battery comprising same
  • Electrolytic copper foil having heat resistance and lithium ion secondary battery comprising same
  • Electrolytic copper foil having heat resistance and lithium ion secondary battery comprising same

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Embodiment Construction

[0023] The electrodeposited copper foil described herein is made using roller deposition, and the electrodeposited copper foil has a roller side and a deposition side. The copper foil has excellent heat resistance, and can be used as a current collector of a lithium ion secondary battery. The copper foil has a roughness Rz controlled to be less than or equal to 2 μm, and has characteristic thermal properties determined by TGA, for example, a major weight increase of 105 wt% in a temperature range of 350°C to 501°C. Ultrasonic welding between copper foil and nickel foil tabs provides an excellent solder joint with low separation to provide good mechanical and electrical contact.

[0024] As used herein, the "roller side" of the copper foil is the surface of the copper foil that comes into contact with the roll used during the electrodeposition process, while the "deposition side" is the opposite side or contact surface during the electrodeposition process to form the copper foi...

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Abstract

An electrolytic copper foil having improved thermal properties. The electrolytic copper foil comprises a roller surface and a deposition surface, each of the two surfaces having a roughness Rz of less than or equal to 2 [mu] m, and wherein the electrolytic copper foil has a main weight increase of 105 wt% when the electrolytic copper foil is subjected to thermogravimetric analysis (TGA) and a main temperature (T105 wt%) is reached during TGA, and wherein the T105 wt% is in the range of 350 DEG C to 501 DEG C. Characteristics of the TGA include heating at a rate of 5 DEG C / min and an airflow of air at a rate of 95 mL / min. Ultrasonic soldering of the copper foil to the nickel foil provides an excellent weld with low separability, thereby providing good mechanical and electrical contact for applications such as in lithium ion secondary batteries.

Description

technical field [0001] The present invention relates to an electrolytic copper foil having high heat resistance. The invention also relates to an electrolytic copper foil having excellent soldering properties, for example good properties for soldering to nickel foil tabs. Background technique [0002] Li-ion secondary batteries have a combination of high energy and high power density, making them ideal for portable electronic devices, power tools, electric vehicles (EVs), energy storage systems (ESS), mobile phones, tablet computers, aerospace applications, military applications , and railway technology options. Electric vehicles (EVs) include hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs). If electric vehicles (EVs) replace most of the transportation vehicles powered by fossil fuels (eg, gasoline, diesel, etc.), lithium-ion secondary batteries will significantly reduce greenhouse gas emissions. The high ene...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/72H01M10/0525H01M10/058C25D1/04
CPCH01M10/058H01M10/0525H01M4/661H01M4/72C25D1/04H01M10/052C25D3/38C25D3/04C25D7/0614Y02E60/10Y02P70/50C25D5/12H01M50/531H01M4/13H01M4/667
Inventor 赖耀生周瑞昌
Owner CHANG CHUN PETROCHEMICAL CO LTD
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