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. 21, 2009
Filed:
Apr. 29, 2004
Hyouk-soo Han, Seoul, KR;
Young-min Choi, Osan-si, KR;
Hyouk-soo Han, Seoul, KR;
Young-min Choi, Osan-si, KR;
Samsung SDI Co., Ltd., Suwon-si, KR;
Abstract
A cathode active material of formula (1) below, and a lithium secondary battery using the same, have an extended cycle life and effective charging/discharging characteristics and include a compound of formula (1) below:LiCoMA  (1)where 0.95≦x≦1.0; 0≦y≦1; M is at least one selected from the group consisting of Ni, Fe, Pb, Mg, Al, K, Na, Ca, Si, Ti, Sn, V, Ge, Ga, B, As, Zr, Mn, and Cr; and A is one selected from the group consisting of O, F, S, and P. The cathode active material has, as measured by Raman spectroscopy, a ratio of peak intensities between spinel and hexagonal Avibrational modes in an approximate range of 1:0.1-1:0.4, a ratio of peak intensities between hexagonal Aand Evibrational modes in an approximate range of 1:0.9-1:3.5, and a ratio of peak intensities between spinel Aand Fvibrational modes in an approximate range of 1:0.2-1:0.4.