NEGATIVE ELECTRODE FOR SECONDARY BATTERY, COPPER FOIL FOR ELECTRODE, SECONDARY BATTERY, AND PROCESS FOR PRODUCING THE NEGATIVE ELECTRODE FOR SECONDARY BATTERY

• Main Authors: ABE HIDETOSHI, TANI TOSHIO, KUBOTA MASAAKI
• Format: Patent
• Language: English
• Published: 16.12.2010
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a secondary battery mounted on an electronic apparatus, an industrial apparatus or a vehicle, which can be charged and discharged, and a negative electrode suitable for it, and a negative electrode collector. SOLUTION: In the negative electrode for the nonaqueous-electrolyte secondary battery, a silicon-based active material film is formed on one or both surfaces of a current collector base material with the usage of the copper foil having a rough surface. A thickness of the silicon-based active material film is 0.5-6 μm or less, surface roughness Rz (ten-point average roughness by JIS BO601-1994) of the surface of the silicon-based active material film is 2-20 μm or less, a three-point average value (average interval between local peaks by SJIS BO601-1994) of the surface of the silicon-based active material film is 0.005-0.14 mm, and a three-point average value (irregularity average interval by SmJIS BO601-1994) of the surface of the silicon-based active material film is 0.015-0.040 mm. COPYRIGHT: (C)2011,JPO&INPIT