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:
Mar. 10, 2015
Filed:
Jun. 19, 2014
Lg Chem, Ltd., Seoul, KR;
Sung-Kyun Chang, Daejeon, KR;
Hong-Kyu Park, Daejeon, KR;
Sinyoung Park, Daejeon, KR;
Hyo-shik Kil, Daejeon, KR;
Hera Lee, Daejeon, KR;
LG Chem, Ltd., Seoul, KR;
Abstract
Provided is a lithium transition metal oxide having an α-NaFeOlayered crystal structure, as a cathode active material for lithium secondary battery, wherein the transition metal includes a blend of Ni and Mn, an average oxidation number of the transition metals except lithium is +3 or higher, and the lithium transition metal oxide satisfies Equations 1 and 2:1.0<(Ni)/(Mn)  (1)(Ni)/(Mn)<1  (2)wherein m(Ni)/m(Mn) represents a molar ratio of nickel to manganese and m (Ni)/m (Mn) represents a molar ratio of Nito Mn. The cathode active material of the present invention has a uniform and stable layered structure through control of oxidation number of transition metals to a level higher than +3, in contrast to conventional cathode active materials, thus advantageously exerting improved overall electrochemical properties including electric capacity, in particular, superior high-rate charge/discharge characteristics.