CARBONACEOUS NEGATIVE ELECTRODE MATERIAL FOR NONAQUEOUS SECONDARY BATTERY, ITS MANUFACTURE AND NONAQUEOUS SECONDARY BATTERY

CARBONACEOUS NEGATIVE ELECTRODE MATERIAL FOR NONAQUEOUS SECONDARY BATTERY, ITS MANUFACTURE AND NONAQUEOUS SECONDARY BATTERY

PROBLEM TO BE SOLVED: To provide a negative electrode material for a nonaqueous secondary battery having large capacity and high efficiency. SOLUTION: This carbonaceous negative electrode material for a nonaqueous secondary battery has a true specific gravity of 1.7-2.15 and a specific surface area...

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Bibliographische Detailangaben
Hauptverfasser: KAMATA TOMIYUKI, TAKAO NORITOSHI, KATO AKIO
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
CHEMISTRY
COMPOUNDS THEREOF
ELECTRICITY
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a negative electrode material for a nonaqueous secondary battery having large capacity and high efficiency. SOLUTION: This carbonaceous negative electrode material for a nonaqueous secondary battery has a true specific gravity of 1.7-2.15 and a specific surface area of 0.1-4 m2/g, while a micropore distribution obtained by the nitrogen gas BET adsorption method contains (1) pores less than 8 diameter 2×10-4 cc/g or above and (2) pores of 8-18 diameters 15×10-4 cc/g or less. The carbonaceous negative electrode material is manufactured by primarily heating the finely powdered carbonaceous material of 100 μm or less mean grain diameters at 250-650 deg.C in an inert gas atmosphere, then secondarily heating at 700-1,500 deg.C in the inert gas atmosphere.