A pre-sodium treated positive electrode material for copper-zinc-based sodium ion battery and method of preparing the same are provided. The method includes the steps of obtaining a mixed solution containing copper-zinc-based elements through wet pre-sodium first, then conducting spray drying of the mixed solution containing copper-zinc-based elements to obtain precursor powder of positive electrode material for copper-zinc-based sodium ion battery, and then mixing the precursor powder with a sodium source for sintering, coating and crushing to obtain positive electrode material for copper-zinc-based sodium ion battery. The pre-sodium treated positive electrode material for copper-zinc-based sodium ion battery thus prepared introduces weakly oxidizing zinc and nickel elements on the basis of the copper-based material, reducing the use of highly oxidizing copper and iron elements. After being prepared into a battery, the oxidation of metal ions in the electrochemical environment is reduced overall.

The present application relates to the technical field of sodium-ion batteries, in particular to a sodium ion battery cathode material, a preparation method thereof, and a sodium ion battery, in an XRD spectrogram of the cathode material, the characteristic diffraction peak A of (003) crystal plane and the characteristic diffraction peak B of (104) crystal plane are arranged at 2 of 15-19 and 39-44, respectively; wherein the microcrystalline size D.sub.A of the characteristic diffraction peak A and the microcrystalline size D.sub.B of the characteristic diffraction peak B satisfy the following condition: 1.3D.sub.A/D.sub.B2.5, wherein D.sub.A and D.sub.B correspond to the microcrystalline sizes of the (003) crystal plane and the (104) crystal plane in the perpendicular line direction, respectively.

The present application relates to the technical field of sodium-ion batteries, in particular to a sodium ion battery cathode material, a preparation method thereof, and a sodium ion battery, in an XRD spectrogram of the cathode material, the characteristic diffraction peak A of (003) crystal plane and the characteristic diffraction peak B of (104) crystal plane are arranged at 2 of 15-19 and 39-44, respectively; wherein the microcrystalline size D.sub.A of the characteristic diffraction peak A and the microcrystalline size D.sub.B of the characteristic diffraction peak B satisfy the following condition: 1.3D.sub.A/D.sub.B2.5, wherein D.sub.A and D.sub.B correspond to the microcrystalline sizes of the (003) crystal plane and the (104) crystal plane in the perpendicular line direction, respectively.

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 positive electrode material, a positive electrode plate, a battery cell, a battery, and an electric apparatus are described. The positive electrode material includes a layered lithium-containing metal oxide, and the layered lithium-containing metal oxide is represented by a general formula Li.sub.aL.sub.xNi.sub.bCo.sub.cMn.sub.dM.sub.(1bcd)O.sub.eN.sub.f, where an L ion is a cation having a radius larger than a radius of a Li ion, M includes at least one of Mg, Zr, Al, B, Ta, Mo, W, Nb, Sb, and La, and N includes at least one of F, S, and P, where 0<a<2, 0b<1, 0c<1, 0d<1, 0<b+c+d1, 0<e2, 0f<2, and 0<x0.8. The technical solutions provided in the embodiments of this application help to improve performance of the positive electrode material and performance of the battery cell.

A positive electrode material, a positive electrode plate, a battery cell, a battery, and an electric apparatus are described. The positive electrode material includes a layered lithium-containing metal oxide, and the layered lithium-containing metal oxide is represented by a general formula Li.sub.aL.sub.xNi.sub.bCo.sub.cMn.sub.dM.sub.(1bcd)O.sub.eN.sub.f, where an L ion is a cation having a radius larger than a radius of a Li ion, M includes at least one of Mg, Zr, Al, B, Ta, Mo, W, Nb, Sb, and La, and N includes at least one of F, S, and P, where 0<a<2, 0b<1, 0c<1, 0d<1, 0<b+c+d1, 0<e2, 0f<2, and 0<x0.8. The technical solutions provided in the embodiments of this application help to improve performance of the positive electrode material and performance of the battery cell.

An electrode active material in the present disclosure has at least one O2-like structure selected from among an O2-type structure, a T#2-type structure, and an O6-type structure, and has a chemical composition shown as Li.sub.aNa.sub.bNi.sub.x-pCO.sub.y-qMn.sub.z-rM.sub.p+q+rO.sub.2(0<a1.00, 0b0.20, 0.15<x<0.35, 0.15<y<0.45, 0.25<z<0.50, x+y+z=1, and 0p+q+r<0.17 are satisfied, and an element M is at least one element selected from among B, Mg, Al, K, Ca, Ti, V, Cr, Fe, Cu, Zn, Ga, Ge, Sr, Y, Zr, Nb, Mo, and W).

An electrode active material in the present disclosure has at least one O2-like structure selected from among an O2-type structure, a T#2-type structure, and an O6-type structure, and has a chemical composition shown as Li.sub.aNa.sub.bNi.sub.x-pCO.sub.y-qMn.sub.z-rM.sub.p+q+rO.sub.2(0<a1.00, 0b0.20, 0.15<x<0.35, 0.15<y<0.45, 0.25<z<0.50, x+y+z=1, and 0p+q+r<0.17 are satisfied, and an element M is at least one element selected from among B, Mg, Al, K, Ca, Ti, V, Cr, Fe, Cu, Zn, Ga, Ge, Sr, Y, Zr, Nb, Mo, and W).

A method for producing mixed metal salts containing manganese ions and at least one of cobalt ions and nickel ions, the method including: an Al removal step of subjecting an acidic solution containing at least manganese ions and aluminum ions, and at least one of cobalt ions and nickel ions, to removal of the aluminum ions by extracting the aluminum ions into a solvent, the acidic solution being obtained by subjecting battery powder of lithium ion batteries to a leaching step; and a precipitation step of neutralizing an extracted residual liquid obtained in the Al removal step under conditions where a pH is less than 10.0, to precipitate mixed metal salts comprising a metal salt of manganese and a metal salt of at least one of cobalt and nickel.

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.

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