Positive electrode active material and its preparation method, sodium ion battery and apparatus containing the sodium ion battery
AssigneeContemporary Amperex Technology (Hong Kong) Limited
InventorsQian Liu, Yongsheng Guo, Chengdu Liang, Wenguang Lin
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Abstract
The present application discloses a positive electrode active material and its preparation method, a sodium ion battery and an apparatus containing the sodium ion battery. The positive electrode active material satisfies a chemical formula Na2+xCuhMnkMlO7-y, wherein M is one or more selected from Li, B, Mg, Al, K, Ca, Ti, V, Cr, Fe, Co, Ni, Zn, Ga, Sr, Y, Nb, Mo, Sn, Ba and W, 0≤x≤0.5, 0.1<h≤2, 1≤k≤3, 0≤l≤0.5, and 0≤y≤1, 2≤h+k+l≤3.5, and 0.57≤(2+x)/(h+k+l)≤0.9.
Claims15
A positive electrode active material, satisfying a chemical formula Na2+xCuhMnkMlO7-y, wherein Mis one or more selected from Li, B, Mg, Al, K, Ca, Ti, V, Cr, Fe, Co, Ni, Zn, Ga, Sr, Y, Nb, Mo, Sn, Ba and W, 0≤x≤0.5, 0.1<h≤2, 1≤k≤3, 0≤l≤0.5, and 0≤y≤1, 3.0≤h+k+l≤3.1, and 0.7≤(2+x)/(h+k+l)≤0.73, and
- wherein the positive electrode active material has a powder resistivity of from 10 Ω·cm to 3kΩ·cm at a pressure of 12 MPa,
- wherein the positive electrode active material has a specific surface area of from 0.01 m2/g to 3 m2/g;
- and,
- wherein the positive electrode active material has a mean particle size DV50 of from 7 μm to 25 μm.
A method for preparing a positive electrode active material, comprising the following steps:
- providing a mixed solution, wherein the mixed solution comprises copper salts and manganese salts, and salts containing an M element are present in the mixed solution in an amount of 0 or more;
- adding a precipitant and a complexing agent into the mixed solution, and then subjecting it to coprecipitation to obtain a precursor;
- and
- mixing the precursor and a sodium source to obtain a mixture and sintering the mixture to obtain the positive electrode active material,
- wherein the positive electrode active material satisfies a chemical formula Na2+xCuhMnkMlO7-y, wherein M is one or more selected from of Li, B, Mg, Al, K, Ca, Ti, V, Cr, Fe, Co, Ni, Zn, Ga, Sr, Y, Nb, Mo, Sn, Ba and W;
- 0≤x≤0.5, 0.1<h≤2, 1≤k≤3, 0≤l≤0.5, 0≤y≤1, 3.0≤h+k+l≤3.1, and 0.7≤(2+x)/(h+k+l)≤0.73, and
- wherein the positive electrode active material has a powder resistivity of from 10 Ω·cm to 3 kΩ·cm at a pressure of 12 MPa,
- wherein the positive electrode active material has a specific surface area of from 0.01 m2/g to 3 m2/g;
- and,
- wherein the positive electrode active material has a mean particle size DV50 of from 7 μm to 25 μm.
A sodium-ion battery, comprising a positive electrode plate, wherein the positive electrode plate comprises a positive electrode active material satisfying a chemical formula Na2+xCuhMnkMlO7-y, wherein M is one or more selected from Li, B, Mg, Al, K, Ca, Ti, V, Cr, Fe, Co, Ni, Zn, Ga, Sr, Y, Nb, Mo, Sn, Ba and W, 0≤x≤0.5, 0.1<h≤2, 1≤k≤3, 0≤l≤0.5, and 0≤y≤1, 3.0≤h+k+l≤3.1, and 0.7≤(2+x)/(h+k+l)≤0.73, and
- wherein the positive electrode active material has a powder resistivity of from 10 Ω·cm to 3kΩ·cm at a pressure of 12 MPa,
- wherein the positive electrode active material has a specific surface area of from 0.01 m2/g to 3 m2/g;
- and,
- wherein the positive electrode active material has a mean particle size DV50 of from 7 μm to 25 μm.
Dependencies are inferred from the claim text.