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:
Jan. 01, 2002
Filed:
Jul. 09, 1998
Kuniyuki Nakanishi, Wakayama, JP;
Nobuyuki Isshiki, Wakayama, JP;
Atsushi Suzuki, Wakayama, JP;
Yoshio Kajiura, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
Disclosed is an electrode material for secondary battery, wherein the discharge capacity is large and the change in potential during the charge/discharge is small. A carbonaceous material, wherein a value of R (degree of raphitization ), which is defined as a ratio of a Raman spectrum intensity at 1580 cm to a Raman spectrum intensity at 1360 cm in the Raman spectrum analysis, is not more than 4.0 and a length of crystallite (Lc) oriented along a crysatllographic c axis obtained by a wide angle X-ray diffraction method is from 25 to 35 nm, of the electrode material is obtained by calcining a material, which can be carbonized by a heat treatment, in the presence of boron nitride or silicon.