The present application provides a positive electrode active material, a preparation method thereof, and a positive electrode plate, a battery cell, a battery, and an electric device containing the same, where the positive electrode active material includes a matrix and a sodium-rich layer formed in situ on the surface of the matrix, the matrix includes a sodium-containing layered transition metal oxide, and the sodium-rich layer includes one or more of sodium salts represented by Formula (I) and Formula (II), where m represents an integer from 1 to 8, and n represents an integer from 2 to 20.

##STR00001##

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: Na.sub.xMn.sub.aFe.sub.bM.sub.cN.sub.dO.sub.2+eF.sub.e, where 0.5x1.1, a0, b0, c0, d>0, a+b +c+d=1, 0.10.1, and e0; M ions include at least one of Ni.sup.2+, Ni.sup.3+, Cu.sup.2+, Cu.sup.+, Zn.sup.2+, Mg.sup.2+, Y.sup.3+, La.sup.3+, In.sup.3+, Sb.sup.3+, Li+, Sn.sup.2+, and Ag.sup.+; B.sub.iI.sub.i.sup.41500 .sup.4, where B.sub.i is a molar fraction of cations, I.sub.i is an ionic potential of the cations, in unit of .sup.1, and the cations include manganese ions, iron ions, M ions, and N ions; and the ionic potential of the N ions is greater than or equal to 5 .sup.1.

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: Na.sub.xMn.sub.aFe.sub.bM.sub.cN.sub.dO.sub.2+eF.sub.e, where 0.5x1.1, a0, b0, c0, d>0, a+b +c+d=1, 0.10.1, and e0; M ions include at least one of Ni.sup.2+, Ni.sup.3+, Cu.sup.2+, Cu.sup.+, Zn.sup.2+, Mg.sup.2+, Y.sup.3+, La.sup.3+, In.sup.3+, Sb.sup.3+, Li+, Sn.sup.2+, and Ag.sup.+; B.sub.iI.sub.i.sup.41500 .sup.4, where B.sub.i is a molar fraction of cations, I.sub.i is an ionic potential of the cations, in unit of .sup.1, and the cations include manganese ions, iron ions, M ions, and N ions; and the ionic potential of the N ions is greater than or equal to 5 .sup.1.

A sodium layered metal oxide, a preparation method thereof, a secondary battery, and an electric apparatus are disclosed. The sodium layered metal oxide has a general chemical formula of Na.sub.1-xA.sub.xC.sub.M.sub.1-O.sub.2, where M includes a transition metal element, A includes at least one of a Group IIA element, a Group V metal element, a Group VIA metal element, or a Group IIIB element with an ionic radius greater than that of M, and C includes at least one of a third-period, fourth-period, or fifth-period metal element with a valence less than or equal to that of M. The parameters satisfy 0.001x0.150 and 0.001y0.500. Doping the sodium layered metal oxide with A and C suppresses layer sliding in a desodiated state, reduces phase transitions, and improves structural stability, thereby enhancing cycle performance and extending the service life of the battery.

A sodium layered metal oxide, a preparation method thereof, a secondary battery, and an electric apparatus are disclosed. The sodium layered metal oxide has a general chemical formula of Na.sub.1-xA.sub.xC.sub.M.sub.1-O.sub.2, where M includes a transition metal element, A includes at least one of a Group IIA element, a Group V metal element, a Group VIA metal element, or a Group IIIB element with an ionic radius greater than that of M, and C includes at least one of a third-period, fourth-period, or fifth-period metal element with a valence less than or equal to that of M. The parameters satisfy 0.001x0.150 and 0.001y0.500. Doping the sodium layered metal oxide with A and C suppresses layer sliding in a desodiated state, reduces phase transitions, and improves structural stability, thereby enhancing cycle performance and extending the service life of the battery.

A method for preparing a sodium-ion battery cathode material includes: compounding metal salt solutions to obtain a mixed metal salt solution, where metal sources include one or more of nickel, iron, and manganese; performing spray pyrolysis on the mixed metal salt solution to obtain a first precursor powder; mixing the first precursor powder with an isopropanol solvent to obtain a first mixed solution; dispersing nano-scale titanium dioxide into the first mixed solution to obtain a second mixed solution; drying the second mixed solution to obtain a second precursor powder; and mixing the second precursor powder with a sodium source for sintering to obtain a sodium-ion battery cathode material. A titanium-doped sodium-ion battery cathode material is prepared by adding a heterogeneous element titanium to suppress a phase change at the beginning of the charging, thereby improving the structure stability, output characteristic, and service life of the sodium-ion battery.

A method for preparing a sodium-ion battery cathode material includes: compounding metal salt solutions to obtain a mixed metal salt solution, where metal sources include one or more of nickel, iron, and manganese; performing spray pyrolysis on the mixed metal salt solution to obtain a first precursor powder; mixing the first precursor powder with an isopropanol solvent to obtain a first mixed solution; dispersing nano-scale titanium dioxide into the first mixed solution to obtain a second mixed solution; drying the second mixed solution to obtain a second precursor powder; and mixing the second precursor powder with a sodium source for sintering to obtain a sodium-ion battery cathode material. A titanium-doped sodium-ion battery cathode material is prepared by adding a heterogeneous element titanium to suppress a phase change at the beginning of the charging, thereby improving the structure stability, output characteristic, and service life of the sodium-ion battery.

The disclosure relates to a positive electrode active material, a manufacturing method of a positive electrode active material, and a battery. The positive electrode active material of the present disclosure includes an Na-containing oxide. The Na-containing oxide has a P2-type structure. The Na-containing oxide includes, as constituent elements, at least: Na; Ca; at least one transition metal element among Mn, Ni, and Co; and O.

The disclosure relates to a positive electrode active material, a manufacturing method of a positive electrode active material, and a battery. The positive electrode active material of the present disclosure includes an Na-containing oxide. The Na-containing oxide has a P2-type structure. The Na-containing oxide includes, as constituent elements, at least: Na; Ca; at least one transition metal element among Mn, Ni, and Co; and O.

The present invention discloses to tungsten doped mixed cationic cathodes for energy devices notably non-aqueous re-chargeable alkali-ion electrochemical cells and batteries and to the process of preparation thereof. More particularly, the present invention discloses to doped cathode active materials of Formula (I) that show a higher capacity and which can able to retains their structure during the entire charging-discharging cycles.