Positive electrode active material for lithium secondary battery, method for preparing same and lithium secondary battery comprising same
US10673071B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2017 |
| Grant date | Jun 2, 2020 |
| Priority date | — |
| Expiry date | Mar 2, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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[LizA(1-z-a)Da]EbO2-b [Formula 1](In the above formula (1), A is NiαCoβMnγ, 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).).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.