Copper foil for current collector of lithium secondary battery

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...

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 electrode, causing the The negative electrode may be damaged, resulting in a significant drop in battery capacity

For lithium secondary batteries with high capacity that require relatively high pressure to press the negative active material onto the copper foil during negative electrode production, the copper foil is more likely to be pressed during the manufacturing process of pressing the negative active material onto the copper foil. broken in steps

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