Clark & Brody
Negative electrode active material for lithium ion secondary battery, method for producing the same, negative electrode, and battery
In the case where a silicon substance having a high theoretical capacity as a negative electrode active material for a lithium ion secondary battery is used as a negative electrode active material, such a negative electrode active material is provided that has a high initial battery capacity and suffers less deterioration in performance even when many cycles of charge and discharge are repeated. A lithium ion secondary battery using the negative electrode active material is provided. Silicon and copper (II) oxide, or silicon, metallic copper and water are pulverized and simultaneously mixed in a pulverization device, thereby providing a negative electrode active material that has good cycle characteristics and a large battery capacity.
DOWA HOLDINGS CO., LTD. TOHOKU UNIVERSITY
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Kazuyuki Yasumitsu Hiroyuki Norihiro Qiwu
Tohji Tanaka Kai Shimoi Zhang