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. 12, 2005
Filed:
Oct. 15, 2002
Jae-phil Cho, Cheonan, KR;
Byung-woo Park, Seoul, KR;
Yong-jeong Kim, Seoul, KR;
Tae-jun Kim, Seoul, KR;
Jae-Phil Cho, Cheonan, KR;
Byung-Woo Park, Seoul, KR;
Yong-Jeong Kim, Seoul, KR;
Tae-Jun Kim, Seoul, KR;
Samsung SDE Co., Ltd., Suwon, KR;
Abstract
A positive active material for a rechargeable lithium battery is provided. The positive active material comprises a lithiated intercalation compound and a coating layer formed on the lithiated intercalation compound. The coating layer comprises a solid-solution compound and an oxide compound having at least two coating elements, the oxide compound represented by the following Formula 1:MM'O  (1)wherein M and M′ are not the same and are each independently at least one element selected from the group consisting of Zr, Al, Na, K, Mg, Ca, Sr, Ni, Co, Ti, Sn, Mn, Cr, Fe, and V; 0<p<1; 0<q<1; and 1<≦2, where r is determined based upon p and q. The solid-solution compound is prepared by reacting the lithiated intercalation compound with the oxide compound. The coating layer has a fracture toughness of at least 3.5 MPam. A method of making the positive active material is also provided.