A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
PROCESS FOR PRODUCING NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY
A process is disclosed which produces a negative electrode material for lithium-ion secondary batteries that has a small irreversible capacity and a large reversible capacity by suppressing exposure of an active graphite surface due to grinding. The process includes melt-mixing graphite particles, pitch having a quinoline insoluble content of 0.3% or less and a fixed carbon content of 50% or more, and a fusible organic substance that volatilizes by 50% or more when heated to 400°C in the air and has a residual carbon content of 3% or less when heated to 800°C in an inert atmosphere, carbonizing the mixture by firing, graphitizing the carbonized product, and grinding the graphitized product. It is preferable that the graphite particles and the pitch be mixed in such a ratio that the amount of the pitch is 25 to 40 parts by weight based on 100 parts by weight of the graphite particles, and a formed product obtained by forming mixture be carbonized by firing, graphitized, and ground.
PROCESS FOR PRODUCING NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY
A process is disclosed which produces a negative electrode material for lithium-ion secondary batteries that has a small irreversible capacity and a large reversible capacity by suppressing exposure of an active graphite surface due to grinding. The process includes melt-mixing graphite particles, pitch having a quinoline insoluble content of 0.3% or less and a fixed carbon content of 50% or more, and a fusible organic substance that volatilizes by 50% or more when heated to 400°C in the air and has a residual carbon content of 3% or less when heated to 800°C in an inert atmosphere, carbonizing the mixture by firing, graphitizing the carbonized product, and grinding the graphitized product. It is preferable that the graphite particles and the pitch be mixed in such a ratio that the amount of the pitch is 25 to 40 parts by weight based on 100 parts by weight of the graphite particles, and a formed product obtained by forming mixture be carbonized by firing, graphitized, and ground.
PROCESS FOR PRODUCING NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY
VERFAHREN ZUR HERSTELLUNG VON NEGATIVEM ELEKTRODENMATERIAL FÜR EINE LITHIUM-ION-SEKUNDÄRBATTERIE
PROCESSUS DE FABRICATION D UN MATÉRIAU D ÉLECTRODE NÉGATIVE POUR PILE SECONDAIRE AU LITHIUM IONIQUE
DOHZONO MITSUAKI (author) / YAMAMOTO MASATAKE (author) / HIUGANO SATOSHI (author) / TAKIZAWA KENTARO (author)
2017-03-29
Patent
Electronic Resource
English
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