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. 16, 2013
Filed:
Jun. 17, 2010
Shingo Kizaki, Amagasaki, JP;
Hideaki Kanno, Amagasaki, JP;
Shingo Kizaki, Amagasaki, JP;
Hideaki Kanno, Amagasaki, JP;
Osaka Titanium Technologies Co., Ltd., Hyogo, JP;
Abstract
A silicon oxide in the form of powder is represented by SiO, wherein, when the silicon oxide is measured by use of an X-ray diffractometer comprising a sealed tube light source as a light source and a high speed detector as a detector, a halo is detected at 20°≦2θ≦40°, and a peak is detected at the highest quartz line position therein. The height P1 of the halo and the height P2 of the peak at the highest quartz line position satisfy P2/P1≦0.05. This silicon oxide is used as the negative electrode active material, whereby a lithium-ion secondary battery having stable initial efficiency and cycle characteristic can be obtained. The x of the SiOis preferably 0.7<x<1.5. A negative electrode material for lithium-ion secondary battery contains not less than 20 mass % of this silicon oxide as a negative electrode active material.