Method of making negative electrode

[Problem] To provide a negative electrode collector for lithium ion secondary batteries, having a high strength and a large discharge capacity. [Means for Resolution] A negative electrode collector using a copper-covered steel foil 10 for carrying a negative electrode active material for lithium ion...

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Hauptverfasser:	FUJII TAKAHIRO, SHIMIZU TAKESHI, MORITA YOSHIKAZU, YOSHIDA YOSHIE, MAJIMA SHO, TSUJIMURA TAKAO, KON NORIHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS APPARATUS THEREFOR BASIC ELECTRIC ELEMENTS CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING ELECTRICITY ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY PERFORMING OPERATIONS PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION SOLDERING OR UNSOLDERING TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	[Problem] To provide a negative electrode collector for lithium ion secondary batteries, having a high strength and a large discharge capacity. [Means for Resolution] A negative electrode collector using a copper-covered steel foil 10 for carrying a negative electrode active material for lithium ion secondary batteries, which has a steel sheet 6 as the core material thereof and has, on both surfaces thereof, a copper covering layer 7 having a mean thickness tCu of from 0.02 to 5.0 μm on each surface, and of which the total mean thickness, t, including the copper covering layer 7 is from 3 to 100 μm with tCu/t of at most 0.3. To the steel sheet 6, for example, applicable is common steel, austenitic stainless steel or ferritic stainless steel. The copper covering layer 7 is, for example, a copper electroplating layer (including one rolled after plating). On the surface of the copper covering layer 7, for example, a carbon-based active material layer that has been densified through strong roll pressing is formed, and the copper-covered steel foil 10 and the carbon-based active material layer constitute the negative electrode collector.