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. 09, 2013
Filed:
Nov. 22, 2011
Sung Kyun Chang, Daejeon, KR;
Hong-kyu Park, Daejeon, KR;
Ho Suk Shin, Seoul, KR;
Seung Tae Hong, Daejeon, KR;
Youngsun Choi, Daejeon, KR;
Sung Kyun Chang, Daejeon, KR;
Hong-Kyu Park, Daejeon, KR;
Ho Suk Shin, Seoul, KR;
Seung Tae Hong, Daejeon, KR;
Youngsun Choi, Daejeon, KR;
LG Chem, Ltd., Seoul, KR;
Abstract
Disclosed herein is a cathode active material for a lithium secondary battery, in particular, including a lithium transition metal oxide with a layered crystalline structure in which the transition metal includes a transition metal mixture of Ni, Mn and Co, and an average oxidation number of all transition metals other than lithium is more than +3, and specific conditions represented by the following formulae (1) and (2), 1.1<m(Ni)/m(Mn)<1.5 and 0.4<m(Ni)/m(Mn)<1, are satisfied. The inventive cathode active material has a more uniform and stable layered structure by controlling the oxidation number of transition metals contained in a transition metal oxide layer to form the layered structure, compared to conventional substances. Accordingly, the active material exhibits improved overall electrochemical characteristics including battery capacity and, in particular, excellent high rate charge-discharge features.