CATHODE ACTIVE MATERIAL AND LITHIUM SECONDARY BATTERY COMPRISING SAME
The present exemplary embodiments relate to a positive electrode active material and a lithium secondary battery including the same. The positive active material for a lithium secondary battery according to an exemplary embodiment includes lithium metal oxide particles including lithium, nickel, cobalt, manganese and doping elements, and includes a first domain and a second domain inside the lithium metal oxide particles.
1 . A positive electrode active material for lithium secondary battery, comprises:
a lithium metal oxide particle comprising lithium, nickel, cobalt, manganese and a doping element,
a first domain and a second domain exist inside the lithium metal oxide particle.
2 . A positive electrode active material for lithium secondary battery, comprises:
a lithium metal oxide particle comprising lithium, nickel, cobalt, manganese and a doping element,
a first domain and a second domain exist inside the lithium metal oxide particle.
3 . The positive electrode active material of claim 2 , wherein:
the primary particle contains the first domain and the second domain.
4 . The positive electrode active material of claim 1 , wherein:
the first domain contains a layered structure.
5 . The positive electrode active material of claim 1 , wherein:
the second domain contains a cubic structure.
6 . The positive electrode active material of claim 1 , wherein:
a crystal grain size of the lithium metal oxide particle is in the range of 127 nm to 139 nm.
7 . The positive electrode active material of claim 1 , wherein:
the doping element includes Zr, Al, Ti and B.
8 . The positive electrode active material of claim 7 , wherein:
the doping amount of the Zr is 0.2 mol % to 0.5 mol % based on 100 mol % of nickel, cobalt, manganese and doping elements.
9 . The positive electrode active material of claim 7 , wherein:
the Al doping amount is 0.5 mol % to 1.2 mol %, based on 100 mol % of nickel, cobalt, manganese and doping elements.
10 . The positive electrode active material of claim 7 , wherein:
a doping amount of the Ti is 0.05 mol % to 0.13 mol % based on 100 mol % of nickel, cobalt, manganese and doping elements.
11 . The positive electrode active material of claim 7 , wherein:
a doping amount of the B is 0.25 mol % to 1.25 mol % with respect to 100 mol % of nickel, cobalt, manganese and doping elements.
12 . The positive electrode active material of claim 1 , wherein:
a content of the nickel in the metal in the lithium metal oxide particle is 80 mol % or more.
13 . The positive electrode active material of claim 1 , wherein:
when measuring the X-ray diffraction pattern of the positive electrode active material for the lithium secondary battery, I(003)/I(104), which is the ratio of the peak intensity of plane (003) to the peak intensity of plane (104), is in the range of 1.210 to 1.230.
14 . The positive electrode active material of claim 1 , wherein:
the positive active material for the lithium secondary battery has an R-factor value of 0.510 to 0.524 as an equation 1 below, when measuring an X-ray diffraction pattern,
R -factor={1(006)+ I (102)}/ I (101) [Equation 1]
15 . A lithium secondary battery comprising:
a positive electrode comprising the positive electrode active material of claim 1 ;
a negative electrode; and
a non-aqueous electrolyte.