The present invention is related to a process for making an electrode active material wherein said process comprises the following steps: (a) Providing a hydroxide TM(OH).sub.2 or at least one oxide TMO or at least one oxyhydroxide of TM or a combination of at least two of the foregoing wherein TM is one or more metals and contains at least 97 mol-% Ni and, optionally, in total up to 3 mol-% of at least one metal selected from Al, Ti, Zr, V, Co, Zn, Ba, and Mn; (b) mixing said hydroxide TM(OH).sub.2 or oxide TMO or oxyhydroxide of TM or combination with a source of lithium and a source of Mg wherein the molar amount of (Li+Mg) corresponds to 75 to 95 mol-% of TM; (c) treating the mixture obtained from step (b) thermally at a temperature in the range of from 450 to 650 C., thereby obtaining an intermediate; (d) mixing the intermediate from step (c) with a source of Li and with at least one compound of a metal M.sup.1 selected from Al, Zr, Co, Mn, Nb, Ta, Mo, and W; (e) treating the mixture obtained from step (d) thermally at a temperature in the range of from 500 to 850 C.

A layered-oxide positive electrode active material may have a molecular formula of Na.sub.xMn.sub.aFe.sub.bNi.sub.cM.sub.dN.sub.eO.sub.2-Q.sub.f, where a doping element M is selected from at least one of Cu, Li, Ti, Zr, K, Sb, Nb, Mg, Ca, Mo, Zn, Cr, W, Bi, Sn, Ge, or Al, a doping element N is selected from at least one of Si, P, B, S, or Se, a doping element Q is selected from at least one of F, Cl, or N, 0.66x1, 0<a0.70, 0<b0.70, 0<c0.23, 0d<0.30, 0e0.30, 0f0.30, 00.30, a+b+c+d+e=1, 0<e+f0.30, 0<(e+f)/a0.30, 0.20d+e+f0.30, and (b+c)/a1.5.

A layered-oxide positive electrode active material may have a molecular formula of Na.sub.xMn.sub.aFe.sub.bNi.sub.cM.sub.dN.sub.eO.sub.2-Q.sub.f, where a doping element M is selected from at least one of Cu, Li, Ti, Zr, K, Sb, Nb, Mg, Ca, Mo, Zn, Cr, W, Bi, Sn, Ge, or Al, a doping element N is selected from at least one of Si, P, B, S, or Se, a doping element Q is selected from at least one of F, Cl, or N, 0.66x1, 0<a0.70, 0<b0.70, 0<c0.23, 0d<0.30, 0e0.30, 0f0.30, 00.30, a+b+c+d+e=1, 0<e+f0.30, 0<(e+f)/a0.30, 0.20d+e+f0.30, and (b+c)/a1.5.

To provide a method of forming a positive electrode active material with high productivity. To provide a manufacturing apparatus capable of forming a positive electrode active material with high productivity. Provided is a method of forming a positive electrode active material including lithium, a transition metal, oxygen, and fluorine. An adhesion preventing step is performed during heating of an object. Examples of the adhesion preventing step include stirring by rotating a furnace during the heating, stirring by vibrating a container containing an object during the heating, and crushing performed between the plurality of heating steps. By these manufacturing methods, a positive electrode active material having favorable distribution of an additive at the surface portion can be formed.

To provide a method of forming a positive electrode active material with high productivity. To provide a manufacturing apparatus capable of forming a positive electrode active material with high productivity. Provided is a method of forming a positive electrode active material including lithium, a transition metal, oxygen, and fluorine. An adhesion preventing step is performed during heating of an object. Examples of the adhesion preventing step include stirring by rotating a furnace during the heating, stirring by vibrating a container containing an object during the heating, and crushing performed between the plurality of heating steps. By these manufacturing methods, a positive electrode active material having favorable distribution of an additive at the surface portion can be formed.

A layered-oxide positive electrode active material may have a molecular formula of Na.sub.xMn.sub.aFe.sub.bNi.sub.cM.sub.dN.sub.eO.sub.2-Q.sub.f, where a doping element M is selected from at least one of Cu, Li, Ti, Zr, K, Sb, Nb, Mg, Ca, Mo, Zn, Cr, W, Bi, Sn, Ge, or Al, a doping element N is selected from at least one of Si, P, B, S, or Se, a doping element Q is selected from at least one of F, Cl, or N, 0.66x1, 0<a0.70, 0<b0.70, 0<c0.23, 0d<0.30, 0e0.30, 0f0.30, 00.30, a+b+c+d+e=1, 0<e+f0.30, 0<(e+f)/a0.30, 0.20d+e+f0.30, and (b+c)/a1.5.

A layered-oxide positive electrode active material may have a molecular formula of Na.sub.xMn.sub.aFe.sub.bNi.sub.cM.sub.dN.sub.eO.sub.2-Q.sub.f, where a doping element M is selected from at least one of Cu, Li, Ti, Zr, K, Sb, Nb, Mg, Ca, Mo, Zn, Cr, W, Bi, Sn, Ge, or Al, a doping element N is selected from at least one of Si, P, B, S, or Se, a doping element Q is selected from at least one of F, Cl, or N, 0.66x1, 0<a0.70, 0<b0.70, 0<c0.23, 0d<0.30, 0e0.30, 0f0.30, 00.30, a+b+c+d+e=1, 0<e+f0.30, 0<(e+f)/a0.30, 0.20d+e+f0.30, and (b+c)/a1.5.

A layered-oxide positive electrode active material may have a molecular formula of Na.sub.xMn.sub.aFe.sub.bNi.sub.cM.sub.dN.sub.eO.sub.2-Q.sub.f, where a doping element M is selected from at least one of Cu, Li, Ti, Zr, K, Sb, Nb, Mg, Ca, Mo, Zn, Cr, W, Bi, Sn, Ge, or Al, a doping element N is selected from at least one of Si, P, B, S, or Se, a doping element Q is selected from at least one of F, Cl, or N, 0.66x1, 0<a0.70, 0<b0.70, 0<c0.23, 0d<0.30, 0e0.30, 0f0.30, 00.30, a+b+c+d+e=1, 0<e+f0.30, 0<(e+f)/a0.30, 0.20d+e+f0.30, and (b+c)/a1.5.

A layered-oxide positive electrode active material may have a molecular formula of Na.sub.xMn.sub.aFe.sub.bNi.sub.cM.sub.dN.sub.eO.sub.2-Q.sub.f, where a doping element M is selected from at least one of Cu, Li, Ti, Zr, K, Sb, Nb, Mg, Ca, Mo, Zn, Cr, W, Bi, Sn, Ge, or Al, a doping element N is selected from at least one of Si, P, B, S, or Se, a doping element Q is selected from at least one of F, Cl, or N, 0.66x1, 0<a0.70, 0<b0.70, 0<c0.23, 0d<0.30, 0e0.30, 0f0.30, 00.30, a+b+c+d+e=1, 0<e+f0.30, 0<(e+f)/a0.30, 0.20d+e+f0.30, and (b+c)/a1.5.

The present application discloses a positive electrode active material and a preparation method thereof, a positive electrode plate, a battery, and an electric device. The positive electrode active material includes:

##STR00001##

where M1 includes a rare earth element; M2 includes at least one of a group IA element, a group IIA element, a group IIIA element, a group IVA element, a group VA element, a group VIA element, and a transition element; and 0.6x1.2, 0<a0.5, 0<b0.4, 0.3c0.75, 0.001d0.05, 0e0.3, 0.10.1, 0f0.1, 0.005d/c0.05, and a+b+c+d+e=1.