US 2015/0311522 A1 · POSITIVE ACTIVE MATERIAL FOR USE IN A LITHIUM ION BATTERY AND METHOD FOR PREPARING THE SAME

Abstract

The present invention provides a positive active material for use in a lithium ion battery, a method for preparing the positive active material and a lithium ion battery containing the positive active material. The positive active material includes a core of lithium containing transition metal oxide represented by Formula LixMyN1-yO2-αAβ and a coating layer of lithium containing transition metal phosphate represented by Formula LiaMbN′1-bPO4-λBζ in situ formed on the core, wherein 0.9≦x≦1.2, 0.6≦y≦1.0, 0.9≦a≦1.1, 0.6≦b≦1.0, 0≦α≦0.2, 0≦β≦0.4, 0≦λ≦0.5, 0≦ζ≦0.5. The positive active material for use in a lithium ion battery according to the present invention has high capacity, desirable cycling performance and safety performance, as well as desirable thermal stability.

Claims12

Dependent claims

A positive active material for use in a lithium ion battery, comprising a core of lithium containing transition metal oxide represented by formula LixMyN1-yO2-αAβ and a coating layer of lithium containing transition metal phosphate represented by formula LiaMbN′1-bPO4-λBζ 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, S, Cl, Se;
and 0.9≦x≦1.2, 0.6≦y≦1.0, 0.9≦a≦1.1, 0.6≦b≦1.0, 0≦α≦0.2, 0≦β≦0.4, 0≦λ≦0.5, 0≦ζ≦0.5.

Dependencies are inferred from the claim text.

Positive active material for use in a lithium ion battery and method for preparing the same

Life of this patent

Positive active material for use in a lithium ion battery and method for preparing the same

Life of this patent

Abstract

Claims12