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:
Aug. 12, 2014
Filed:
May. 02, 2013
Jx Nippon Oil & Energy Corporation, Tokyo, JP;
JX Nippon Oil & Energy Corporation, Tokyo, JP;
Abstract
Provided is an amorphous carbon material for a negative electrode of a lithium ion secondary battery. The amorphous carbon material comprises a size of a crystallite Lc(002) in c-axis direction ranging from 2.0 to 8.0 nm, the size being calculated from a (002) diffraction line of the amorphous carbon material measured by powder X-ray diffractometry; a carbon-derived spectrum appearing in a range from 3,200 to 3,400 gauss (G) in an electron spin resonance measured using X band; a relative signal intensity ratio (I/I) of the spectrum ranging from 2.4 to 3.5, wherein the relative signal intensity ratio is a ratio of signal intensity (I) at temperature of 4.8 K to signal intensity (I) at temperature of 40K; and a line width (ΔHpp) of the spectrum ranging from 70 to 180 gauss (G), wherein the line width is calculated from a first-order derivative spectrum at temperature of 4.8 K.