Method of forming solid-state electrolyte powder

1 . A method of forming a solid-state electrolyte powder, comprising:

forming a zirconium compound layer on an inner surface of a container, wherein a thickness of the zirconium compound layer is between 0.05 mm and 0.2 mm;

placing a precursor mixture on the zirconium compound layer, wherein the precursor mixture comprises a first salt group and a second salt group, the first salt group comprises zirconium source compound, lanthanum source compound, aluminum source compound, titanium source compound, tantalum source compound, or combinations thereof, and the second salt group comprises lithium source compound; and

performing an aerobic sintering process to form the solid-state electrolyte powder.

2 . The method of claim 1 , wherein the zirconium compound layer comprises zirconium dioxide, zirconium hydroxide, zirconium nitrate, zirconyl nitrate, zirconium hydrogen phosphate, zirconium tetrachloride, zirconium dichloride oxide, zirconium sulfate, or combinations thereof.

3 . The method of claim 1 , wherein forming the zirconium compound layer on the inner surface of the container comprises:

applying a zirconium compound coating on the inner surface of the container; and

drying the zirconium compound coating to form the zirconium compound layer, wherein a drying temperature is between 40° C. and 120° C.

4 . The method of claim 1 , wherein a temperature of the aerobic sintering process is between 850° C. and 1280° C.

5 . The method of claim 1 , further comprising:

after performing the aerobic sintering process, performing a cleaning process to mix the solid-state electrolyte powder with a cleaning solution to form a mixed solution, wherein the cleaning solution comprises an acid and an alcohol; and

separating the solid-state electrolyte powder from the mixed solution.

6 . The method of claim 5 , wherein the acid comprises an inorganic acid or an organic acid, the inorganic acid comprises hydrochloric acid, phosphoric acid, sulfuric acid, nitric acid, boric acid, or combinations thereof, and the organic acid comprises formic acid, acetic acid, or a combination thereof.

7 . The method of claim 5 , wherein the alcohol comprises methanol, ethanol, isopropanol, or combinations thereof.

8 . The method of claim 5 , wherein the acid is hydrochloric acid, the alcohol is ethanol, and a concentration of the hydrochloric acid in the cleaning solution is between 0.1 wt % and 30 wt %.

9 . The method of claim 5 , wherein a solid content of the solid-state electrolyte powder in the mixed solution is between 1% and 50%.

10 . A method of forming a solid-state electrolyte powder, comprising:

performing an anaerobic sintering process on a precursor mixture to form a precursor, wherein the precursor mixture comprises a first salt group and a second salt group, the first salt group comprises zirconium source compound, lanthanum source compound, aluminum source compound, titanium source compound, tantalum source compound, or combinations thereof, and the second salt group comprises lithium source compound;

placing the precursor on a container;

after performing the anaerobic sintering process, performing an aerobic sintering process; and

performing a cleaning process with a cleaning solution, wherein the cleaning solution comprises an acid and an alcohol.

11 . The method of claim 10 , wherein a temperature of the anaerobic sintering process is between 800° C. and 1100° C.

12 . The method of claim 10 , wherein a temperature of the anaerobic sintering process is lower than a temperature of the aerobic sintering process.

13 . The method of claim 10 , further comprising:

before placing the precursor mixture on the container, forming a zirconium compound layer on the container.

14 . A method of forming a solid-state electrolyte powder, comprising:

forming a zirconium compound layer on an inner surface of a container, wherein a thickness of the zirconium compound layer is between 0.05 mm and 0.2 mm;

performing a grinding process on a precursor mixture, wherein the precursor mixture comprises a first salt group and a second salt group, the first salt group comprises zirconium source compound, lanthanum source compound, aluminum source compound, titanium source compound, tantalum source compound, or combinations thereof, and the second salt group comprises lithium source compound;

after performing the grinding process, placing the precursor mixture on the zirconium compound layer; and

performing a sintering process.

15 . The method of claim 14 , wherein, based on 100 wt % of the precursor mixture, the first salt group is between 70 wt % and 78 wt %, and the second salt group is between 22 wt % and 30 wt %.

16 . The method of claim 14 , wherein performing the grinding process comprises:

grinding the first salt group;

after grinding the first salt group, mixing the first salt group and the second salt group; and

grinding the first salt group and the second salt group.

17 . The method of claim 14 , further comprising:

after performing the sintering process, performing a cleaning process with a solution of hydrochloric acid and an alcohol.

18 . The method of claim 14 , wherein performing the sintering process comprises performing an anaerobic sintering process and performing an aerobic sintering process.