Rolled copper foil and negative electrode of lithium ion secondary battery using same

Abstract

The invention relates to rolled copper foil and a negative electrode of lithium ion secondary battery using the same. The rolled copper foil not only is of high intensity, high heat resistance, high conductive rate and good processing ability and the like, and has high tightness of the resin contained in a negative electrode active material layer without applying coarse processing such as plating of electro-deposition particles on a surface of the copper foil. The rolled copper foil is characterized by comprising a main component of Cu, adding elements A containing one or more elements atomic radius is smaller than that of the Cu, and copper alloy containing unavoidable impurities, wherein variation of the atomic distance is below -0.002pm when a total of (atomic radius difference of each adding element of the adding element A and the Cu) plus (atom% of each adding element) is taken as the variation of atom distance caused by the adding element, and a total quantity of the adding element A is below 1.0 weight%.

Description

technical field [0001] The present invention relates to a current collector suitable for a lithium ion secondary battery, a rolled copper foil having excellent resin adhesion, and a lithium ion secondary battery negative electrode using the rolled copper foil. Background technique [0002] Lithium-ion secondary batteries are used as batteries for electronic devices such as mobile PCs and mobile terminals because they can obtain high voltage and high energy density, and are also active in many organizations as driving batteries for automobiles conduct research and development. [0003] The basic structure of lithium-ion secondary batteries is that lithium ions in the electrolyte move between positive and negative plates insulated by a separator to repeatedly charge and discharge. It is important to find an electrolyte that can realize this structure with high cycle characteristics, Materials for separator, positive and negative plates. [0004] A negative electrode plate us...

AI Technical Summary

Problems solved by technology

In these patent documents, in the above-mentioned patent document 1, in order to solve the problem that the fixation effect of uneven and high-roughened roughened particles is weakened, and high adhesion between the negative electrode current collector and the negative electrode active material cannot be obtained , the method of implementing multiple plating treatments or reflow treatments is adopted to have a complex structure on the surface of copper foil by using roughened particles with low roughness

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