| US 7,563,540 B2 | ||
| Cathode active material and lithium secondary battery using the same | ||
| Hyouk-soo Han, Seoul (Korea, Republic of); and Young-min Choi, Osan-si (Korea, Republic of) | ||
| Assigned to Samsung SDI Co., Ltd., Suwon-si (Korea, Republic of) | ||
| Filed on Apr. 29, 2004, as Appl. No. 10/834,067. | ||
| Claims priority of application No. 10-2003-0051115 (KR), filed on Jul. 24, 2003. | ||
| Prior Publication US 2005/0019661 A1, Jan. 27, 2005 | ||
| Int. Cl. H01M 4/58 (2006.01) | ||
| U.S. Cl. 429—231.3 [429/231.1; 429/231.2; 429/231.4; 429/231.8; 429/223; 252/521.2] | 8 Claims |
| 1. A cathode active material of formula (1) below:
LixCoyM1-yA2 (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 of said formula (1) having, as measured by Raman spectroscopy, a ratio of peak intensities between
spinel and hexagonal A1g vibrational modes in an approximate range of 1:0.1-1:0.4, a ratio of peak intensities between hexagonal A1g and Eg vibrational modes in an approximate range of 1:0.9-1:3.5, and a ratio of peak intensities between spinel A1g and F2g vibrational modes in an approximate range of 1:0.2-1:0.4.
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