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Copper foil, method for manufacturing same, electrode comprising same, and secondary battery comprising same

A secondary battery, manufacturing method technology, applied in the direction of electrode carrier/current collector, non-aqueous electrolyte storage battery, lithium storage battery, etc., can solve the problems of short life, waste of resources, inconvenience to consumers, etc., to minimize inconvenience and waste of resources minimized effect

Active Publication Date: 2018-08-31
SK NEXILIS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, even if the secondary battery sufficiently has a high charge / discharge capacity, when the charge / discharge capacity of the secondary battery sharply decreases as charge / discharge cycles are repeatedly performed (i.e., when the capacity retention rate is low or the life is short), Consumers need to replace secondary batteries frequently, which will cause inconvenience to consumers and waste of resources

Method used

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  • Copper foil, method for manufacturing same, electrode comprising same, and secondary battery comprising same
  • Copper foil, method for manufacturing same, electrode comprising same, and secondary battery comprising same
  • Copper foil, method for manufacturing same, electrode comprising same, and secondary battery comprising same

Examples

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Effect test

Embodiment 1

[0082] at 50A / dm 2 A current density of 10 mm was applied to the anode plate and the rotating cathode drum arranged at a distance of 10 mm in the electrolyte solution of the electrolytic cell, whereby a copper film was electrodeposited on the rotating cathode drum. For electroplating as described above, the copper wire heat-treated at 700°C was acid-washed with sulfuric acid, put into the electrolytic solution, and the rotating cathode The surface of the drum is ground.

[0083] In the step of forming the copper film, the electrolytic solution was maintained at 50° C. and continuous filtration of the electrolytic solution was performed, and the flow rate of the electrolytic solution supplied to the electrolytic cell was 40 m 3 / hour, and the flow deviation is adjusted within 1%. In the electrolyte, the copper concentration is maintained at 70±10g / L, the sulfuric acid concentration is maintained at 80±10g / L, the concentration of thiourea as an organic sulfide additive is main...

Embodiment 2

[0087] In addition to the total current i applied via the nucleation-generating plating bath c_total and the total current i applied via the nuclei growth plating bath t_total Copper foil was manufactured in the same manner as in Example 1 except that the ratio was 0.31.

Embodiment 3

[0089] In addition to the total current i applied via the nucleation plating bath c_total and the total current i applied through the nuclei growth plating bath t_total Copper foil was produced in the same manner as in Example 1 except that the ratio was 1.97.

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Abstract

Disclosed are a copper foil capable of securing a secondary battery having a high capacity retention rate, a method for manufacturing the same, an electrode comprising the same, and a secondary battery comprising the same. In the present invention, the copper foil for the secondary battery has a first surface and a second surface located opposite to the first surface, wherein each of the first andsecond surfaces has 1 to 8 macro protrusions per 5[mu]m when the cross sections thereof are observed in EBSD pictures.

Description

technical field [0001] The present invention relates to a copper foil and its manufacturing method, an electrode including the copper foil, and a secondary electrode including the electrode. Background technique [0002] A secondary battery is a type of energy conversion device that stores electrical energy in the form of chemical energy and generates electricity by converting the chemical energy into electrical energy when electrical energy is needed, and is also rechargeable. It is called "rechargeable battery". [0003] Secondary batteries are economical and environmentally friendly compared to disposable primary batteries, and there are lead storage batteries, nickel-cadmium secondary batteries, nickel-metal hydride secondary batteries, lithium secondary batteries, and the like. [0004] Lithium secondary batteries are capable of storing a relatively large amount of energy in terms of size and weight compared to other secondary batteries. Therefore, in the field of inf...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/131H01M4/36H01M10/052C25D3/38C25D17/02C25D7/06H01M4/02H01M4/13
CPCC25D3/38H01M10/052C25D7/0614C25D7/0657H01M4/661C25D1/04C25D5/10C25D5/48Y02E60/10C25D5/623H01M4/131H01M4/36C25D17/02
Inventor 金昇玟
Owner SK NEXILIS CO LTD
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