| 摘要 |
The present invention provides a positive active material for use in a secondary lithium battery, a method for preparing the positive active material and a secondary lithium battery containing the positive active material. The positive active material includes a core of lithium transition metal oxide represented by Formula LixMyN1-yO2-αAβ and a coating layer of lithium transition metal silicate represented by Formula x′Li2O.y′N′Oa.SiO2-λBζwhich in-situ formed on the core, wherein 0.8≦x≦1.3, 0.6≦y≦1.0, 0.01≦x′≦2.1, 0.2≦y′≦1.5, 0.1≦a≦3.0, 0≦α≦0.2, 0≦β≦0.4, 0≦λ≦0.5, 0≦ζ≦0.5. The positive active material according to the present invention has high capacity, desirable cycling performance and safety performance, as well as desirable thermal stability. |
| 主权项 |
1. A positive active material for a secondary lithium battery, comprising:
a core of lithium transition metal oxide represented by Formula LixMyN1-yO2-αAβ and a coating layer of lithium transition metal silicate represented by Formula x′Li2O.y′N′Oa.SiO2-λBζ which in-situ formed on the core, wherein element represented by M is at least one of Ni, Co and Mn; element represented by N and N′ each is at least one of Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Ra, Al, Ga, In, Ge, Sn, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu; element represented by A and B each is at least one of N, F, P, 5, Cl, Se; and 0.8≦x≦1.3, 0.6≦y≦1.0, 0.01≦x′≦2.1, 0.2≦y′≦1.5, 0.1≦a≦3.0, 0≦α≦0.2, 0≦β≦0.4, 0≦λ≦0.5, 0≦ζ≦0.5. |
