Negative Electrode Active Material, Method For Producing The Negative Electrode Active Material, And Lithium Ion Secondary Battery Using The Negative ...


Ontology type: sgo:Patent     


Patent Info

DATE

2012-08-08T00:00

AUTHORS

NAOI, KATSUHIKO , NAOI, WAKO , ISHIMOTO, SHUICHI , TAMAMITSU, KENJI

ABSTRACT

Disclosed is a negative electrode active material which has a high capacity and good cyclability. The negative electrode active material comprises nanosize carbon particles and nanosize tin dioxide particles that are supported in a high-dispersion state on the nanosize carbon particles. The negative electrode active material has a high discharge capacity because of the reversible progress of a conversion reaction of tin dioxide (SnO2+4Li++4e-→ 2Li2O+Sn) therein. In a charge-discharge cycle test within a voltage range of 0 to 2 V vs. an Li/Li+ electrode, the negative electrode active material shows a discharge capacity retention rate of about 90% even after 500 charge-discharge cycles at the rate 1C, which indicates excellent cyclability. Therefore, the negative electrode active material can be suitably used in a lithium ion secondary battery and a hybrid capacitor. More... »

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