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:
Jun. 02, 2020
Filed:
Mar. 02, 2017
L&f Co., Ltd., Daegu, KR;
Su An Choi, Daegu, KR;
Sang Hoon Jeon, Daegu, KR;
Su Youn Kwon, Daegu, KR;
Mi Hye Yun, Daegu, KR;
Yu Jin Sohn, Daegu, KR;
Ji Sun An, Daegu, KR;
Bong Jun Jeong, Daegu, KR;
L&F CO., LTD., Daegu, KR;
Abstract
In an embodiment of the present invention, a positive active material for a lithium secondary battery is represented by Formula 1, and includes a core including a compound having a core portion and a surface portion, and the compound has a lower L3/L2 intensity ratio of Ni in the surface portion than an L3/L2 intensity ratio of Ni in the core portion.Li[LiAD]EO  [Formula 1] (In the above formula (1), A is NiCoMn, D is at least one element selected from the group consisting of Na, K, Mg, Ca, Sr, Ni, Co, Ti, Al, B, Si, Sn, Mn, Cr, Fe, V, Zr, Nb, and Mo, E is at least one element selected from the group consisting of P, F, and S, −0.05≤z≤0.1, 0≤a≤0.05, 0≤b≤0.05, 0.3≤α≤0.9, 0.05≤β≤0.4, and 0.05≤γ≤0.4.) (The L3/L2 intensity ratio of Ni is the oxidation number of Ni measured by electronic energy loss spectroscopy (EELS).).