Positive active material for rechargeable lithium battery, method for manufacturing the same, and rechargeable lithium battery including the same
View Patent ↗Disclosed are a positive active material for a rechargeable lithium battery including a nickel-containing lithium transition metal composite oxide and a coating layer positioned on the surface of the lithium transition metal composite oxide, wherein the coating layer includes vanadium oxide, lithium vanadium oxide, or a combination thereof, a method of manufacturing the same, and a rechargeable lithium battery including the same.
1. A positive active material for a rechargeable lithium battery, comprising:
a nickel-containing lithium transition metal composite oxide; and
a coating layer positioned on the surface of the lithium transition metal composite oxide,
wherein the coating layer comprises Li c V 2 O 5 (0.05≤c≤6), and
wherein an inside of the lithium transition metal composite oxide comprises a compound represented by the following Chemical Formula 1 and an outside of the lithium transition metal composite oxide comprises a compound represented by the following Chemical Formula 2:
Li a Ni x M 1 y M 2 z O 2 [Chemical Formula 1]
wherein, in the above Chemical Formula 1, M 1 and M 2 are the same or different and are selected from Co, Mn, Al, Ti, Mg, or Zr, 1≤a≤1.05, 0.6≤x<1, 0.01<y≤0.35, and 0.01<z≤0.35,
Li a Ni x M 1 y M 2 z V t O 2 [Chemical Formula 2]
wherein, in the above Chemical Formula 2, M 1 and M 2 are the same or different and are selected from Co, Mn, Al, Ti, Mg, or Zr, 1≤a≤1.05, 0.6≤x<1, 0.01<y≤0.35, 0.01<z≤0.35, and 0.001<t≤0.02.
2. The positive active material for a rechargeable lithium battery of claim 1 , wherein the lithium transition metal composite oxide comprises about 60 mol % or more of nickel based on the total amount of a transition metal.
3. The positive active material for a rechargeable lithium battery of claim 1 , wherein the coating layer comprises V 2 O 5 and Li c V 2 O 5 (0.05≤c≤6).
4. The positive active material for a rechargeable lithium battery of claim 3 , wherein the outside of the coating layer comprises V 2 O 5 , and
the inside of the coating layer comprises Li c V 2 O 5 (0.05≤c≤6).
5. The positive active material for a rechargeable lithium battery of claim 1 , wherein the coating layer is comprised in an amount of about 0.1 to about 5 parts by mole based on 100 parts by mole of a total amount of transition metals in the lithium transition metal composite oxide, wherein the total amount of transition metals is a total amount of Ni, M 1 and M 2 included in Chemical Formula 1.
6. A rechargeable lithium battery comprising: a positive electrode including the positive active material for the rechargeable lithium battery of claim 1 ; a negative electrode; and an electrolyte.