Copper foil for current collector of lithium secondary battery

A secondary battery and electrolytic copper foil technology, which is applied in the field of copper foil for lithium secondary battery collectors, can solve problems such as copper foil damage, battery capacity drop, and negative electrode damage

Active Publication Date: 2019-06-11
CHANG CHUN PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the following disadvantages: when the volume of the active material layer expands due to the repetition of charge and discharge cycles, stress will act on the negative electrode
When an electrode having a large expansion rate and contraction rate is used in a rechargeable secondary battery, charge and discharge cycles are repeated many times during the service life of the battery, repeatedly imparting stress to the copper foil of the ele...

Method used

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  • Copper foil for current collector of lithium secondary battery
  • Copper foil for current collector of lithium secondary battery
  • Copper foil for current collector of lithium secondary battery

Examples

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Embodiment Construction

[0032] As used in the various figures, similar elements in different views may be given common numerical designations to help the reader understand the various embodiments.

[0033] As used in this specification and claims, the surface roughness is measured in "Rz" standard (JIS B 0601-1994, using an α-type surface roughness and profile measuring instrument manufactured by Kosaka Laboratory Ltd. (Model: SE1700)) is measured and provided, although other systems exist that can be used to measure surface roughness, not all surface roughness measurement systems are equivalent. According to this Rz standard, the results are expressed as the average value of 10 points.

[0034] Such as figure 1 , which illustrates a typical apparatus 10 for manufacturing electrolytic copper foil. A rotatable metal negative roll 11 is placed in a partially submerged position relative to the copper-containing electrolyte 12 . A positive electrode 13 of insoluble metal is placed in contact with the ...

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Abstract

Electrodeposited copper foils having adequate puncture strength to withstand both pressure application during consolidation with negative electrode active materials during manufacture, as well as expansion/contraction during repeated charge/discharging cycles when used in a rechargeable secondary battery are described. These copper foils find specific utility as current collectors in rechargeablesecondary batteries, particularly in lithium secondary battery with high capacity. Methods of making the copper foils, methods of producing negative electrode for use in lithium secondary battery andlithium secondary battery of high capacity are also described.

Description

technical field [0001] The present disclosure relates to a copper foil having a breakdown strength, and is made to be suitable for a variety of uses. These copper foils are particularly useful as current collectors in rechargeable secondary batteries, especially lithium secondary batteries with high capacity. A method of making the copper foil, a method of producing a negative electrode for a lithium secondary battery, and a high-capacity lithium secondary battery are also disclosed. Background technique [0002] Electrification is the most viable path to a clean and efficient transportation system that is critical to sustainable development around the world. In the near future, electric vehicles (EV), including hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), and battery electric vehicles (BEV), will dominate the clean vehicle market. By 2020, it is expected that more than half of new cars sold may be EV models. The key and enabling technology for...

Claims

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Application Information

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IPC IPC(8): C25D1/04C25D3/38H01M4/66H01M10/0525
CPCC25D1/04C25D3/38Y10T428/12431C25D7/0614H01M10/052H01M4/661Y02E60/10H01M4/139H01M4/043H01M2220/20H01M4/045H01M2004/027H01M4/38C25D7/0642
Inventor 黄慧芳郑桂森赖耀生周瑞昌
Owner CHANG CHUN PETROCHEMICAL CO LTD
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