Rechargeable battery and manufacturing method thereof

• Main Authors: AKASHI, HIROYUKI, INAGAKI, NAOKO
• Format: Patent
• Language: English
• Published: 11.12.2005
• Edition: 7
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The present invention provides a rechargeable battery including a separator material capable of achieving a rechargeable battery with superior high-temperature cycling characteristics and a high energy density, and a method of manufacturing a rechargeable battery. A separator is evaluated and selected by thermal decomposition gas chromatography (thermal decomposition+GC/MS). In an ideal separator, the value of (the area of Peak 1 representing 1-Decene)/(the area of Peak 2 representing 1-Octene) in a total ion chromatogram (TIC) of the pyrolysate of the separator is 2.05 or less. More preferably, a material in which the value of (the area of Peak 1)/(the area of Peak 2) is 2.00 or less, the value of (the area of Peak 1)/(the area of Peak 3 representing 1-Nonene) is 1.87 or less, and the value of (the area of Peak 3)/(the area of Peak 2) is 1.05 or less is selected and is used for the operation of the separator.