COPPER FOIL FOR NEGATIVE ELECTRODE CURRENT COLLECTOR OF LITHIUM ION SECONDARY BATTERY, NEGATIVE ELECTRODE MATERIAL OF LITHIUM ION SECONDARY BATTERY, AND METHOD FOR SELECTING NEGATIVE ELECTRODE CURRENT COLLECTOR OF LITHIUM ION SECONDARY BATTERY

A copper foil for a negative electrode current collector of a lithium ion secondary battery enables prevention of deformation of the current collector even if the charge/discharge operation is repeatedly carried out. In a copper foil for a negative electrode current collector of a lithium ion second...

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Bibliographische Detailangaben
Hauptverfasser:	TOMONAGA SAKIKO, MIYAKE KOICHI, MATSUSHIMA HIDEAKI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRICITY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Beschreibung
Zusammenfassung:	A copper foil for a negative electrode current collector of a lithium ion secondary battery enables prevention of deformation of the current collector even if the charge/discharge operation is repeatedly carried out. In a copper foil for a negative electrode current collector of a lithium ion secondary battery, a 10 mm wide test specimen composed of the copper foil is subjected to a tensile test, a maximum strain loaded on the copper foil is 30 N or higher in a region where "Value L" represented by the following expression is 0.8 or more in a strain-stress curve obtained in the tensile test where O is the starting point of the curve, PQ is the load at a point Q on the curve and EQ is an elongation at a point Q on the curve Value   L = ( area   of   triangle   OQE Q ) ( area   of   region   OQE Q )   ...  ( 1 )