Patent ID: 11916225
Assignee: SK ON CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A lithium secondary battery, comprising:
a cathode including a cathode current collector, a cathode active material base layer formed on the cathode current collector and a cathode active material coating layer formed on a surface of the cathode active material base layer;
an anode including an anode current collector, an anode active material base layer formed on the anode current collector and an anode active material coating layer formed on a surface of the anode active material base layer; and
a separation layer interposed between the cathode and the anode,
wherein the cathode active material coating layer has a thickness of 20 μm or less,
wherein the anode material coating layer has a thickness of 20 μm or more and 30 μm or less,
wherein a sum of thicknesses of the cathode active material coating layer and the anode active material coating layer is 40 μm or less,
each thickness of the cathode active material base layer and the anode active material base layer is in a range from 100 μm to 200 μm, and
wherein the cathode active material base layer includes a lithium-nickel based oxide, and the cathode active material coating layer includes lithium iron phosphate (LFP), and
wherein the lithium-nickel based oxide includes a compound represented by the following Chemical Formula 1:

Li1+aNi1−(x+y)CoxMyOz  [Chemical Formula 1]

wherein, in the Chemical Formula 1 above, −0.05≤a≤0.15, 0.01≤x≤0.2, 0≤y≤0.2, 1.98≤z≤2.02, and M is at least one element selected from a group consisting of Mg, Sr, Ba, B, Al, Si, Mn, Ti, Zr and W.