NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

• Main Authors: MIYOSHI, KAZUHIRO, TAKAHASHI, YASUFUMI, TODE, SHINGO, KINOSHITA, AKIRA, ABE, KOJI, FUJITANI, SHIN, FUJIMOTO, HIROYUKI, NAKANE, IKURO
• Format: Patent
• Language: English; French; Japanese
• Published: 20.10.2005
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

A nonaqueous electrolyte secondary battery comprising a negative electrode containing a graphite material as the negative electrode active material, a positive electrode mainly containing a lithium cobaltate as the positive electrode active material, and a nonaqueous electrolyte solution is characterized in that the lithium cobaltate contains a group IVA element and a group IIA element in the periodic table, and the nonaqueous electrolyte solution contains 0.2-1.5 weight% of a compound having a sulfonyl group and preferably further contains 0.5-4 weight% of a vinylene carbonate. Une batterie secondaire à Electrolyte non aqueux composEe d'une Electrode nEgative contenant un matEriau de graphite comme matEriau actif d'Electrode nEgative, d'une Electrode positive principalement constituEe de cobaltate de lithium comme matEriau actif d'Electrode positive et d'une solution d'Electrolyte non aqueux, se caractErise en ce que le cobaltate de lithium contient un ElEment du groupe IVA et un ElEment du groupe IIA du tableau pEriodique, et en ce que la solution d'Electrolyte non aqueux contient de 0,2 A 1,5 % en poids d'un composE possédant un groupe sulfonyle et aussi, de prEfErence, 0,54 % en poids de carbonate de vinylEne.