Easily handleable electrolytic copper foil, electrode comprising the same, secondary battery comprising the same, and method for manufacturing the same

Abstract

An easily handleable electrolytic copper foil securing a highly durable secondary battery, an electrode including same, a secondary battery including same, and a method of manufacturing same. The electrolytic copper foil including first and second surfaces includes a copper layer including a matte surface facing the first surface and a shiny surface facing the second surface, a first protective layer formed on the matte surface of the copper layer, and a second protective layer formed on the shiny surface of the copper layer. A coefficient of thermal expansion of the electrolyte copper foil measured using thermomechanical analyzer while heating the electrolytic copper foil from 30 to 190 DEG C. at 5 DEG C per min ranges from 16 to 22 [mu]m / (m*DEG C), tensile strength of the electrolytic copper foil measured after heat treatment at 190 DEG C, ranges from 21 to 36 kgf / mm2, and weight deviation of the electrolytic copper foil is 5% or less.

Description

[0001] This application claims priority and benefit from Korean Patent Application No. 2016-0131979 filed on October 12, 2016, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0002] The present invention relates to an easily-handled electrolytic copper foil, an electrode including the same, a secondary battery including the same, and a manufacturing method thereof. Background technique [0003] A secondary battery is this type of energy conversion device that converts electrical energy into chemical energy, stores the chemical energy, and generates electricity by converting the chemical energy into electrical energy when electricity is needed. Recharge the battery". [0004] Lead-acid batteries, nickel-cadmium secondary batteries, nickel-hydrogen secondary batteries, lithium secondary batteries, and the like are secondary batteries that are economically and environmentally advantageous compared to primary batteries. [0005] Co...

AI Technical Summary

Problems solved by technology

However, due to the heat generated when the lithium secondary battery is charged or discharged, this composite active material rapidly and significantly expands, resulting in breakage of the electrolytic copper foil.

In addition, the thickness of the electrolytic copper foil usually used to manufacture the anode of the lithium secondary battery is 10 μm or less, and this electrolytic copper foil is particularly prone to curling or wrinkling, and the curling or wrinkling of the electrolytic copper foil not only makes the electrolytic copper foil Difficult to handle, also makes it impossible to coat electrolytic copper foil with active materials

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