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:
Jul. 09, 2013
Filed:
Sep. 12, 2011
Naokage Tanaka, Kyoto, JP;
Akira Inaba, Kyoto, JP;
Masayuki Yamada, Kyoto, JP;
Masayuki Yoshiya, Kyoto, JP;
Naokage Tanaka, Kyoto, JP;
Akira Inaba, Kyoto, JP;
Masayuki Yamada, Kyoto, JP;
Masayuki Yoshiya, Kyoto, JP;
Hitachi Maxell, Ltd., Ibaraki-Shi, Osaka, JP;
Abstract
The non-aqueous secondary battery of the present invention includes a positive electrode, a negative electrode, a non-aqueous electrolyte, and a separator, the negative electrode contains a negative electrode active material containing a graphitic carbon material and a composite in which a carbon coating layer is formed on a surface of a core material containing Si and O as constituent elements, the composite has a carbon content of 10 to 30 mass %, the composite has an intensity ratio I/Iof a peak intensity Iat 510 cmderived from Si to a peak intensity Iat 1343 cmderived from carbon of 0.25 or less when a Raman spectrum of the composite is measured at a laser wavelength of 532 nm, and the half-width of the (111) diffraction peak of Si is less than 3.0° when the crystallite size of an Si phase contained in the core material is measured by X-ray diffractometry using CuKα radiation.