Positive Electrode Active Material For Lithium-Ion Battery, A Positive Electrode For Lithium-Ion Battery, And Lithium-Ion Battery
The present invention provides a positive electrode active material for lithium ion batteries having excellent battery property. The positive electrode active material for lithium ion batteries is represented by composition formula: Li x Ni 1-y M y O 2+α , wherein M is Co as an essential component and at least one species selected from a group consisting of Sc, Ti, V, Cr, Mn, Fe, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B and Zr, 0.9≦x≦1.2, 0<y≦0.7, α>0.05, and an average particle size (D50) is 5 μm to 15 μm.
1 . A positive electrode active material for lithium ion batteries, represented by composition formula: Li x Ni 1−y M y O 2+α , wherein
M is Co as an essential component and at least one species selected from a group consisting of Sc, Ti, V, Cr, Mn, Fe, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B and Zr, 0.9≦x≦1.2, 0<y≦0.7, α>0.05, and
an average particle size (D50) is 5 μm to 15 μm.
2 . The positive electrode active material for lithium ion batteries of claim 1 , wherein the average particle size (D50) is 7 μm to 13 μm.
3 . The positive electrode active material for lithium ion batteries of claim 1 , wherein M is at least one species selected from a group consisting of Mn and Co.
4 . The positive electrode active material for lithium ion batteries of claim 1 ,
wherein α>0.15.
5 . The positive electrode active material for lithium ion batteries of claim 4 , wherein α>0.20.
6 . The positive electrode active material for lithium ion batteries of claim 1 ,
wherein D90 is 20 μm or less in particle size distribution.
7 . A positive electrode for lithium ion batteries comprising the positive electrode active material for lithium ion batteries of claim 1 .
8 . A lithium ion battery comprising the positive electrode for lithium ion batteries of claim 7 .