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:
Dec. 02, 2014
Filed:
Jul. 08, 2011
Kouji Yasuda, Amagasaki, JP;
Shingo Kizaki, Amagasaki, JP;
Shinji Shimosaki, Amagasaki, JP;
OSAKA Titanium technologies Co., Ltd., Hyogo, JP;
Abstract
A negative electrode material powder for a lithium ion secondary battery having a conductive carbon film on the surface of a lower-silicon-oxide powder; wherein a specific surface area in BET measurement ranges from more than 0.3 m/g to 40 m/g, and no SiC peak appears at 2θ=35.6°±0.01° or the half-value width of the appeared peak is 2° or more in XRD measurement using CuKrays. The proportion of said carbon film preferably ranges from 0.2% to 2.5% by mass. Said powder preferably has 100000 Ωcm or less of specific resistance. In XRD, P2/P1<0.01 is preferably satisfied between the highest value P1 of halo of SiOand a value P2 of the strongest linear peak of Si (111) above the halo. Accordingly, said powder can be used in the secondary battery with a large discharge capacity and a preferable cycle characteristics for practical use.