Abstract

The invention relates to an electrodeposited copper foil and its manufacturing method. The copper foil has an as produced tensile strength above 52 kgf/mm2, presents tensile strength above 50 kgf/mm2 after 120 days at 35° C. and presents a recrystallization property under thermal stress. The copper foil is manufactured using an electrolyte comprising: copper at a concentration of at least 60 g/L; sulfuric acid at a concentration of at least 60 g/L; a halogen ion at a concentration of less than 2 mg/L; a thiourea-family electrolytic additive at a concentration between 0.001 mg/L and 0.1 mg/L; and a TOC in the electrolyte of less than 10 mg/L.

IPC Classes  ?

• C25D 1/04 - WiresStripsFoils
• H01M 4/66 - Selection of materials
• H01M 4/75 - Wires, rods, or strips

Abstract

An electrolytic copper foil is disclosed. The electrolytic copper foil has an excellent elongation by adjusting an average cross-sectional grain size on at least one surface area of the electrolytic copper foil, with respect to a cross-section perpendicular to a longitudinal direction, and a ratio of the grain size. An electrode for a secondary battery and a secondary battery including the electrolytic copper foil are disclosed.

IPC Classes  ?

• H01M 4/66 - Selection of materials
• H01M 4/04 - Processes of manufacture in general
• H01M 4/134 - Electrodes based on metals, Si or alloys
• H01M 4/70 - Carriers or collectors characterised by shape or form

Abstract

A double layered electrolytic copper foil is disclosed. It is possible to freely control various physical properties of the double layered electrolytic copper foil. The double layered electrolytic copper foil contains a first copper layer, a second copper layer, and an interface formed between one surface of the first copper layer and one surface of the second copper layer. A method of manufacturing the double layered electrolytic copper foil is also disclosed.

IPC Classes  ?

• C25D 1/04 - WiresStripsFoils
• H05K 1/09 - Use of materials for the metallic pattern
• H05K 3/20 - Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by affixing prefabricated conductor pattern
• H01M 4/66 - Selection of materials
• C25D 3/38 - ElectroplatingBaths therefor from solutions of copper
• C25D 7/06 - WiresStripsFoils

Abstract

An electrolytic copper foil having improved elongation and electrical conductivity is disclosed. The improved elongation and electrical conductivity are due to an increase in shape deformation of grains selective to a specific direction and an increase in an average grain size after heat treatment. An electrode for a secondary battery including the electrolytic copper foil, and a secondary battery including the electrode are disclosed.

IPC Classes  ?

• H01M 4/66 - Selection of materials
• C25D 3/38 - ElectroplatingBaths therefor from solutions of copper

Abstract

An electrolytic copper foil securing high strength characteristics such as tensile strength is disclosed. The electrolytic copper foil can secure high strength characteristics by maintaining an area ratio of fine grains and grain boundaries in the electrolytic copper foil even after high-temperature heat treatment. An electrode for a secondary battery including the electrolytic copper foil, and a secondary battery including the electrode are also disclosed.

IPC Classes  ?

• H01M 4/66 - Selection of materials
• C25D 1/04 - WiresStripsFoils
• C25D 3/38 - ElectroplatingBaths therefor from solutions of copper
• H01M 10/052 - Li-accumulators
• C25D 7/06 - WiresStripsFoils

Abstract

A copper foil having high fracture energy after heat treatment to be strong against breakage is disclosed. Also disclosed are an electrode for secondary batteries and a secondary battery exhibiting, by including the copper foil, excellent characteristics in terms of, for example, cycle lifespan, safety, and workability.

IPC Classes  ?

• H01M 4/66 - Selection of materials
• C22F 1/08 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon

Abstract

A copper foil having high fracture energy to be strong against breakage is disclosed. An electrode for secondary batteries and a secondary battery exhibiting, by including the copper foil, excellent characteristics in terms of, for example, cycle lifespan, safety, and workability are also disclosed.

IPC Classes  ?

• H01M 4/66 - Selection of materials
• H01M 10/052 - Li-accumulators
• C25D 1/04 - WiresStripsFoils