The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 2017
Filed:
Jul. 08, 2015
Tohoku University, Miyagi, JP;
Dowa Holdings Co., Ltd., Tokyo, JP;
Norihiro Shimoi, Miyagi, JP;
Kazuyuki Tohji, Miyagi, JP;
Yasumitsu Tanaka, Miyagi, JP;
Qiwu Zhang, Miyagi, JP;
Hiroyuki Kai, Tokyo, JP;
TOHOKU UNIVERSITY, Miyagi, JP;
DOWA HOLDINGS CO., LTD., Tokyo, JP;
Abstract
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.