Electrode active material for lithium secondary battery
View Patent ↗Provided is an electrode active material comprising a nickel-based lithium transition metal oxide (LiMO 2 ) wherein the nickel-based lithium transition metal oxide contains nickel (Ni) and at least one transition metal selected from the group consisting of manganese (Mn) and cobalt (Co), wherein the content of nickel is 50% or higher, based on the total weight of transition metals, and has a layered crystal structure and an average primary diameter of 3 μm or higher, wherein the amount of Ni 2+ taking the lithium site in the layered crystal structure is 5.0 atom % or less.
1. Electrode active material particles, comprising:
a nickel-based lithium transition metal oxide comprising lithium (Li), nickel (Ni) and at least one transition metal selected from the group consisting of manganese (Mn) and cobalt (Co),
wherein a content of nickel in the nickel-based lithium transition metal oxide is 50% or higher, based on the total weight of transition metal,
wherein the nickel-based lithium transition metal oxide has a layered crystal structure,
wherein an amount of Ni 2+ taking a lithium site in the layered crystal structure is 5.0 atom% or less, and
wherein said electrode active material particles have an average primary diameter of 3 μm or higher.
2. The electrode active material particles according to claim 1 , wherein the at least one transition metal comprises Mn and Co, wherein the Mn content is 10% to 45% and the Co content is 5% to 40%, based on the total weight of transition metal.
3. The electrode active material particles according to claim 1 , wherein the at least one transition metal is partially substituted by one or more elements selected from the group consisting of Al, Mg, Ti and Zr.
4. The electrode active material particles according to claim 3 , wherein the content of the substituted elements is 0.1 to 5% based on the total weight of transition metal.
5. The electrode active material particles according to claim 1 , wherein the amount of Ni 2+ taking a lithium site is 0.1 to 5.0 atom%.
6. The electrode active material particles according to claim 1 , wherein the amount of Ni 2+ taking a lithium site is 0.1 to 4.0 atom%.
7. The electrode active material according to claim 1 , wherein, for the nickel-based lithium transition metal oxide, a ratio of transition metal to lithium is 1.005 to 1.30.
8. The electrode active material according to claim 7 , wherein, for the nickel-based lithium transition metal oxide, the ratio of transition metal to lithium is 1.01 to 1.20.
9. The electrode active material according to claim 7 , wherein, for the nickel-based lithium transition metal oxide, the ratio of transition metal to lithium is 1.005 to 1.20.
10. The electrode active material according to claim 7 , wherein, for the nickel-based lithium transition metal oxide, the ratio of transition metal to lithium is 1.01 to 1.30.
11. The electrode active material particles of claim 1 , wherein the content of nickel in the nickel-based lithium transition metal oxide is 50% to 90%, based on the total weight of transition metal.
12. The electrode active material particles of claim 1 , wherein the content of nickel in the nickel-based lithium transition metal oxide is 53% to 90%, based on the total weight of transition metal.
13. The electrode active material particles of claim 1 , wherein the content of nickel in the nickel-based lithium transition metal oxide is 67% to 90%, based on the total weight of transition metal.
14. The electrode active material particles of claim 1 , wherein the content of nickel in the nickel-based lithium transition metal oxide is 53% or higher, based on the total weight of transition metal.
15. The electrode active material particles of claim 1 , wherein the content of nickel in the nickel-based lithium transition metal oxide is 67% or higher, based on the total weight of transition metal.
16. A cathode active material, comprising:
the electrode active material particles of claim 1 .
17. The cathode active material according to claim 16 , wherein said cathode active material particles are aggregated.
18. A lithium secondary battery, comprising:
the cathode active material of claim 16 .