KR101025214B1 - The Method for Producing an Electrolyte and the Electrolyte Powder Producing by the Same Method - Google Patents

Abstract

The present invention relates to a method for producing an electrolyte powder for a fuel cell and an electrolyte powder thereby, which can produce a nano-sized powder having a higher specific surface area than a conventional commercial powder.

In the method of preparing an electrolyte powder for a fuel cell of the present invention, polyethylene glycol (PEG) is dissolved in a volume ratio of 0.002 to 0.006 based on the total volume of the distilled water while dissolving the ceria precursor and the rare-to-metal precursor in distilled water at a mass corresponding to the molar ratio of the following formula. And an ultrasonic treatment step of preparing an aqueous solution solution of the precursor solution to prepare a precursor aqueous solution, and adding hydroxide in a volume ratio of 0.2 to 0.5 based on the total volume of the distilled water while performing ultrasonic treatment on the precursor aqueous solution. It may comprise an electrolyte gel manufacturing step of preparing the electrolyte solution in an electrolyte gel and an electrolyte powder preparation step of preparing an electrolyte powder by washing and drying the electrolyte gel with alcohol.

<Formula>

X _a Ce _b O _c Where X is a rare earth metal, a = 0.01 to 0.4, b = 1-a, c = 2b + 3a / 2

 Solid Oxide Fuel Cell, Electrolyte Powder, Ultrasonication

Description

The method for producing an electrolyte powder for a fuel cell and the electrolyte powder by the same {The Method for Producing an Electrolyte and the Electrolyte Powder Producing by the Same Method}

The present invention relates to a method for producing an electrolyte powder for a fuel cell used in a solid oxide fuel cell and an electrolyte powder thereby.

Solid Oxide Fuel Cells (SOFCs) are the next generation energy conversion system with high energy conversion efficiency and pollution reduction that generate electricity through the electrochemical reaction of hydrogen and oxygen. In other words, solid oxide fuel cells are attracting attention as a key field of renewable energy as a clean / high efficiency energy production system. Therefore, due to the applicability and importance of the solid oxide fuel cell, academic and commercial research is being actively conducted at the same time.

However, since the solid oxide fuel cell is accompanied by a high temperature operating environment unlike other fuel cell systems, the materials used for the solid oxide fuel cell have very high demands on thermal, mechanical and electrical properties. In the long term, the YSZ-based electrolyte material, which has been studied a lot, has a problem of deterioration in mechanical and electrical properties due to deterioration of chemical stability of the material in the long term. Therefore, the solid oxide fuel cell system can operate at a lower temperature than the YSZ-based electrolyte material in order to secure long-term economic efficiency, and the research on materials having excellent ion conductivity without changing internal resistance and polarization resistance by low temperature operation is concentrated. It is becoming.

Recently, ceria-based electrolyte materials that exhibit high ion conductivity have been cited as electrolyte materials for solid oxide fuel cells that can operate in a low temperature region. However, ceria-based electrolyte materials are generally difficult to have high sintered densities below 1500 degrees, which makes them difficult to select other components including electrode materials.

It is an object of the present invention to provide a method for producing an electrolyte powder for a fuel cell and an electrolyte powder thereby, which can produce a nano-sized powder having a higher specific surface area than a conventional commercial powder.

In the method of preparing an electrolyte powder for a fuel cell of the present invention, polyethylene glycol (PEG) is dissolved in a volume ratio of 0.002 to 0.006 based on the total volume of the distilled water while dissolving the ceria precursor and the rare-to-metal precursor in distilled water at a mass corresponding to the molar ratio of the following formula. And an ultrasonic treatment step of preparing an aqueous solution solution of the precursor solution to prepare a precursor aqueous solution, and adding hydroxide in a volume ratio of 0.2 to 0.5 based on the total volume of the distilled water while performing ultrasonic treatment on the precursor aqueous solution. And an electrolyte gel preparation step of preparing the electrolyte solution into an electrolyte gel, and an electrolyte powder preparation step of preparing an electrolyte powder by washing and drying the electrolyte gel with alcohol.

<Formula>

X _a Ce _b O _c Where X is a rare earth metal, a = 0.01 to 0.4, b = 1-a, c = 2b + 3a / 2

In addition, in the present invention, the ceria precursor may be nitrate or chloride including ceria, and the nitrate of the ceria precursor may be Ce (NO ₃ ) ₃ · H ₂ O.

In addition, in the present invention, the rare earth metal may be at least one selected from the group consisting of Sm, Pr, Eu, Gd, La, Tb, Dy, Ho, Er, Tm and Lu. In addition, the rare earth metal precursor is nitrate or chloride containing a rare earth metal, and the nitrate of the rare earth metal precursor is Gd (NO ₃ ) ₃ H ₂ O or Sm (NO ₃ ) ₃ H ₂ May be O.

In addition, in the present invention, the polyethylene glycol may be PEG 200, PEG 400 or PEG 600.

In addition, in the present invention, the ultrasonic treatment is a process temperature of the precursor aqueous solution for introducing the hydroxide to the precursor aqueous solution is maintained at a temperature of 30 ℃ to 99 ℃, the process time for adding the hydroxide to the precursor aqueous solution is at least It can be 30 minutes.

In addition, in the present invention, the hydroxide may be at least one selected from NaOH and KOH or a mixture thereof.

In addition, in the present invention, the electrolyte powder manufacturing step further includes an electrolyte powder grinding step of grinding the electrolyte powder to a nano size, ball milling (attrition milling) or jet milling (zet) milling).

In addition, the electrolyte powder according to an embodiment of the present invention can be prepared by the method for producing an electrolyte powder for a fuel cell as described above.

According to the method of manufacturing an electrolyte powder for a fuel cell of the present invention, the particles are manufactured in a nano sized powder, so that the powder can be sintered at a lower temperature than the conventional one. It is effective.

In addition, according to the method of preparing an electrolyte powder for a fuel cell of the present invention, since the synthesis of the electrolyte powder is performed at an atomic level, it is easy to ensure homogeneity of ion doping added, and a ceria-based electrolyte is formed to form various rare earth metal-based oxides and solid solutions. It can be easily synthesized, and there is an effect that the synthesis proceeds quickly in a short time.

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to a fuel cell electrolyte powder manufacturing method according to an embodiment of the present invention.

1 shows a process diagram of a method of manufacturing an electrolyte powder for a fuel cell according to an embodiment of the present invention.

In the fuel cell electrolyte powder manufacturing method according to an embodiment of the present invention, referring to Figure 1, the precursor aqueous solution manufacturing step (S10), sonication step (S20), electrolyte gel manufacturing step (S30) and electrolyte powder manufacturing step (S40) It can be made, including). In addition, in the electrolyte powder manufacturing step (S40) it may be made further comprising an electrolyte powder grinding step (S45).

The electrolyte powder manufacturing method for a fuel cell according to an embodiment of the present invention forms a rare earth doping ceria. The rare earth doped ceria is formed to have a composition corresponding to the following formula. The rare earth-doped ceria is formed by chemically reacting a ceria precursor and a rare earth metal precursor.

<Formula>

X _a Ce _b O _c Where X is a rare earth metal, a = 0.01 to 0.4, b = 1-a, c = 2b + 3a / 2

When the content of the rare earth metal is less than 0.01 in the molar ratio, the electrolyte powder has a small amount of oxygen attacker generated by doping, and thus the ionic conductivity is very low, thereby acting as a solid electrolyte. In addition, when the content of the rare earth metal is greater than 0.4 in a molar ratio, the concentration of the oxygen attacker having excellent mobility, which combines the rare earth metal ions employed in ceria (CeO ₂ ) with the oxygen attacker and determines the characteristics of the solid electrolyte, is drastically reduced. There is a problem.

The method for preparing an electrolyte powder for a fuel cell uses an ultrasonic wave (ultra-sonic wave) in the process of forming an electrolyte oxide powder using a mixed precursor of a ceria precursor and a rare earth metal precursor to supply energy for a chemical reaction to decompose the precursors, and This increases the chemical reactivity of the synthesis process.

In addition, the method of manufacturing an electrolyte powder for a fuel cell prevents agglomeration between electrolyte oxide particles generated by a chemical reaction by applying ultrasonic waves, thereby making it easier to manufacture nano-sized powder.

Accordingly, the method for preparing an electrolyte powder for a fuel cell can produce a nano-level powder having a relatively small size compared to the bulk-level powder formed by a solution method (coprecipitation method), which is a general powder manufacturing method.

The precursor aqueous solution manufacturing step (S10) is a mass ratio of 0.002 to 0.006 volume ratio based on the total volume of the distilled water while quantifying the ceria precursor and the rare earth metal precursor in a mass corresponding to the molar ratio of the cerium and rare earth metal of the formula. Polyethylene glycol (PEG) is added to prepare a precursor aqueous solution.

The ceria precursor is mixed at a molar concentration of 0.0001 to 0.001 M. If the molar concentration of the ceria precursor is too low, the amount of the electrolyte powder produced is small. In addition, when the molar concentration of the ceria precursor is too high, the ceria precursor may not be sufficiently dissolved in distilled water.

As the ceria precursor, nitrate or chloride including cerium (Ce) is used. As the ceria precursor, nitrates such as Ce (NO ₃ ) ₃ .H ₂ O may be preferably used. The ceria precursor is decomposed into cerium ions (Ce ³⁺ ) in an aqueous solution, and is formed in the form of cerium hydroxide (Ce-OH) by combining with a hydroxyl group (or hydroxy group; OH ⁻ ) of a hydroxide added later. In addition, the cerium hydroxide is formed of ceria (cerium oxide; CeO ₂ ) while H ₂ O is decomposed through a condensation reaction.

As the rare earth metal precursor, nitrate or chloride including rare earth metal may be used. As the nitrate of the rare earth metal precursor, Gd (NO ₃ ) ₃ H ₂ O or Sm (NO ₃ ) ₃ H ₂ O may be used. Meanwhile, the rare earth metal precursor may be a precursor including at least one metal selected from the group consisting of Sm, Pr, Eu, Gd, La, Tb, Dy, Ho, Er, Tm, and Lu. Therefore, the electrolyte powder may include at least one rare earth metal selected from the group consisting of Sm, Pr, Eu, Gd, La, Tb, Dy, Ho, Er, Tm, and Lu. That is, the electrolyte powder according to the present invention consists of a compound of ceria element and rare earth metal.

The rare earth precursor is decomposed into a rare earth element in an aqueous solution like a ceria precursor and is combined with a ceria element to form an electrolyte powder which is an oxide.

The polyethylene glycol is mixed in a volume ratio of 0.002 to 0.006 based on the total volume of distilled water. The polyethylene glycol is a water-soluble solvent to generate a polymer material during the synthesis of ceria powder so that the ceria precursor can maintain the powder form. That is, the polyethylene glycol induces nano-sized powder synthesis by preventing the further condensation reaction surrounding the surface of the cerium hydroxide formed in the aqueous solution. If the content of the polyethylene glycol is too small, there is no added effect, if too much is left as impurities in the ceria powder. The polyethylene glycol may be PEG 200, PEG 400 or PEG 600.

The sonication step (S30) is a step of preparing an aqueous electrolyte solution by adding an aqueous hydroxide solution in a 0.2 to 0.5 volume ratio based on the total volume of the distilled water while performing an ultrasonic treatment for the precursor aqueous solution. In addition, the ultrasonic treatment step is carried out by putting together an ultrasonic rod (ultrasonic horn).

The hydroxide may be used at least one selected from NaOH and KOH or a mixture thereof. In addition, the hydroxide aqueous solution may be dissolved in water to a certain concentration may be used in the form of an aqueous solution. As the hydroxide aqueous solution, an aqueous solution having a hydroxide concentration of 0.01 to 0.1 g / ml may be used. In addition, the hydroxide is mixed in a volume ratio of 0.2 to 0.5 based on the total volume of distilled water . The hydroxide aqueous solution is insufficient in the formation of cerium hydroxide when the concentration of the hydroxide is too low.

The hydroxide is added to the precursor aqueous solution to supply a hydroxyl group to the ions of the precursor so that the precursor has the form of a hydroxide. In addition, the precursor hydroxide is later formed into an electrolyte oxide through a condensation reaction. Thus, the hydroxide acts as a source of oxygen needed to form electrolyte oxide from the precursor.

In the sonication step (S30), the sonication is preferably performed while adding hydroxide in the form of drops while applying an ultrasonic wave to the precursor aqueous solution. Therefore, the precursor ions formed by decomposition of the precursor, that is, cerium ion (Ce ^{3 +} ) or cerium ion (Ce ^{3 +} ) and rare earth metal ions (Gd ^{3 +} , Sm ^{3 +} ) are combined with hydroxyl groups. The ion of the precursor is formed in the form of a hydroxide while being supplied with energy by the ultrasonic wave at. That is, the cerium ion is formed in the form of cerium hydroxide (Ce-OH), and the cerium ion and the rare earth metal ion are formed in the form of cerium-rare earth metal hydroxide (Ce-Gd-OH). The hydroxides are formed in the form of oxides while H ₂ O is removed through a condensation reaction.

In addition, the ultrasonic wave is simultaneously supplied to a chemical reaction between the precursor and the hydroxide, thereby increasing the chemical reactivity of the ions and preventing aggregation between particles formed by the chemical reaction, thereby forming a powder having a relatively small particle size. .

The ultrasonic treatment step (S30) is to maintain the process temperature of the precursor aqueous solution for injecting hydroxide into the precursor aqueous solution, that is, the heating temperature of the precursor aqueous solution at or above room temperature, preferably above a specific temperature selected from 30 ℃ to 99 ℃ It is maintained, and more preferably proceeds in a state maintained at a specific temperature selected from 60 ℃ to 80 ℃. Therefore, the sonication step is to add a hydroxide in the state that the temperature of the precursor aqueous solution reaches the set process temperature so that the chemical reaction of the hydroxide and the precursor can be carried out more efficiently. As the process temperature of the precursor aqueous solution is maintained higher than room temperature, the reaction rate of the precursor aqueous solution is increased. Therefore, the precursor aqueous solution does not need to maintain the heating temperature lower than the normal temperature, but if too high, there is a problem in that the moisture of the precursor aqueous solution evaporates.

In addition, the sonication step is performed for a processing time of at least 30 minutes. Here, the process time means a time from the time when the precursor aqueous solution is heated to the process temperature and the hydroxide is added. If the process time for which the ultrasonic wave is applied is too short, the chemical reaction may not be sufficient. However, when the process time of the ultrasonic treatment step is 2 hours, most of the chemical reaction proceeds, so it is not significant to set it to 2 hours or more.

In addition, in the ultrasonic treatment step, the output power of the ultrasonic wave is appropriately changed according to the amount of the electrolyte solution.

The electrolyte gel manufacturing step (S40) is a step of forming the electrolyte solution to the electrolyte gel by removing water from the electrolyte solution. The aqueous electrolyte solution is dried in an electrolyte gel state by centrifugation or heating. The centrifugation may be appropriately performed according to the amount of the aqueous electrolyte solution.

The electrolyte powder manufacturing step (S50) is a step of forming an electrolyte powder by washing the electrolyte gel with alcohol and drying the alcohol. The electrolyte gel is dispersed in alcohol to remove moisture and reaction residues present therein. The electrolyte gel is then dried at 100 ° C. for a suitable time to completely remove alcohol. The electrolyte gel is preferably subjected to at least two dispersion and drying processes to completely remove water and reaction residues present in the electrolyte gel.

The electrolyte powder grinding step (S55) is a step of grinding the electrolyte powder to a nano size. As the method for grinding the electrolyte powder, various methods used for grinding the powder may be used. The electrolyte powder may be pulverized by a dry pulverization method and may be pulverized by a wet pulverization method if necessary. Therefore, when the electrolyte powder is pulverized by the wet grinding method, it is not necessary to remove the alcohol present in the electrolyte gel in the preparation of the electrolyte powder. The electrolyte powder grinding method may be ball milling, attrition milling or jet milling.

Next will be described in more detail with reference to specific embodiments according to the manufacturing method of the electrolyte powder for a fuel cell of the present invention.

&Lt; Example 1 >

It was added a mixture of the ceria precursor of _{Ce (NO 3) 3 · 6H} 2 O , and a rare earth metal precursor is _{Gd (NO 3) 3 · H} 2 O in distilled water and stirred with 150㎖ dissolved to prepare a precursor solution. Here, the rare earth metal precursor is _{Gd (NO 3) 3 · H} 2 O , the electrolyte powder is Gd _{0 .1} Ce _{0 .9} O so as to have the composition of formula ₁ is _0.95 and the mixing ratio of the ceria precursor was determined. In addition, the ceria precursor solution was prepared such that the molar concentration of the ceria precursor was 0.005M. .

In this process, 0.4 ml of polyethylene glycol 400 (PEG 400) was mixed to form a precursor aqueous solution. An ultrasonic rod was added to the precursor aqueous solution and subjected to ultrasonic treatment while stirring. In addition, when the precursor aqueous solution was heated to reach a process temperature of 75 ° C., an aqueous solution of NaOH was added dropwise to the precursor aqueous solution to advance a chemical reaction to form an electrolyte aqueous solution. At this time, the NaOH aqueous solution is a concentration of 0.02g / ㎖, 50mL was added. The sonication proceeded for 60 minutes.

The precursor aqueous solution was charged to a centrifuge tube and centrifuged at 7000 rpm for 300 seconds to form an electrolyte gel. The electrolyte gel was again dispersed and washed in ethanol, and after this process twice, a pale yellow ceria gel was formed. The electrolyte gel was further dispersed in ethanol and dried at 100 ° C. for 5 hours to form a ceria-based electrolyte powder.

The electrolyte powder was again formed into nano-sized uniform electrolyte powder through pulverization, and the electrolyte powder had a light yellow color.

<Example 2>

Example 2 is the same as Example 1 except that a mixture of a ceria precursor and a rare earth metal precursor, Sm (NO ₃ ) ₃ H ₂ O, is used. Here, the rare-earth metal precursor, _{Sm (NO 3) 3 · H} 2 O , the electrolyte powder is Sm _{0 0 .9 .1} Ce O so as to have the composition of formula ₁ is _0.95 and the mixing ratio of the ceria precursor was determined.

<Example 3>

Example 3 is the same as Example 1, except that a mixture of ceria precursor and rare earth metal precursor Gd (NO ₃ ) ₃ .H ₂ O and Sm (NO ₃ ) ₃ .H ₂ O is used. Here, Gd (NO ₃ ) ₃ H ₂ O and Sm (NO ₃ ) ₃ H ₂ O, which are the rare earth metal precursors, are mixed with ceria precursors such that the electrolyte powder has a chemical composition of Gd _0.1 Sm _0.1 Ce _0.8 O _1.9 . This was determined.

The following describes the results of evaluating the characteristics of the electrolyte powder prepared according to the above embodiment.

<Projection Electron Microscope Analysis>

For the nano-sized electrolyte powder according to Example 1, the particle size was analyzed by a projection electron microscope. 2 is a projection electron micrograph of the electrolyte powder according to Example 1. (B) in FIG. 2 is a photograph taken by enlarging (a).

Referring to FIG. 2, it can be seen that the electrolyte powder doped with the rare earth metal Gd according to Example 1 has a very fine particle size of 10 nm or less and a uniform particle size distribution. In addition, the electrolyte powder can be seen that the grain (grain) growth up to the micro-scale

<Scanning electron microscope analysis>

The electrolyte powder according to Example 1 was analyzed by scanning electron microscopy (SEM) of the powder shape after washing with alcohol and after drying. Figure 3 is a scanning electron microscope (SEM) photograph of the powder shape after the alcohol washing (a) and after drying (b) of the electrolyte powder according to Example 1.

Referring to FIG. 3, it can be seen that the electrolyte powder according to Example 1 is formed of nano-sized powder having a very high uniformity.

<Sintering characteristic evaluation>

Sintering characteristics including the sintering temperature of the electrolyte powders according to Examples 1 and 2 were evaluated. 4 is a scanning electron micrograph of a sintered body sintered from an electrolyte powder according to Example 1; 5 is a scanning electron micrograph of a sintered compact molded and sintered into an electrolyte powder according to Example 2;

4 and 5, after forming the electrolyte powder according to Examples 1 and 2 in the form of a disk and formed by cold isostatic pressing (CIP) to a sintering temperature of 1,300 ℃ sintering time 6h As a result of sintering, it can be seen that the sintered compact is compactly formed. In addition, it can be seen that the electrolyte powders according to Example 1 and Example 2 were densely formed even though the sintering temperature was set to 1,300 ° C. This sintering temperature is 250 ° C lower than the 1,550 ° C or more commonly used in the past, it is possible to lower the sintering temperature during the preparation of the electrolyte.

<Component Analysis>

The sintered compacts formed from the electrolyte powders of Examples 1, 2 and 3 were subjected to component analysis with a scanning electron microscope. 6 is an EDS analysis spectrum of a sintered body sintered from an electrolyte powder according to Example 1; 7 is an EDS analysis spectrum of the sintered body sintered with the electrolyte powder according to Example 2. FIG. 8 is an EDS analysis spectrum of a sintered body sintered from an electrolyte powder according to Example 3. FIG.

Referring to FIG. 6, it can be seen that the sintered compact according to Example 1 includes Ce and Gd. As a result of confirming the composition using an EDS (Energy-Dispersive Spectrometer), Ce: 21.21 atomic weight% and Gd: 2.81 atomic weight Measured as%, O: 75.98 atomic weight%, it can be seen that the composition has a value close to the designed composition ratio.

In addition, referring to Figure 7, it can be seen that the sintered compact according to Example 2 includes Ce and Sm, and as a result of confirming the composition using an EDS (Energy-Dispersive Spectrometer) Ce: 22.41 atomic weight%, Sm: 3.16 It was measured as atomic weight% and O: 74.43 atomic weight%, and it can be seen that the composition has a value close to the designed composition ratio.

In addition, referring to FIG. 8, it can be seen that the sintered compact according to Example 3 includes Ce, Sm, and Gd.

1 shows a process diagram of a method of manufacturing an electrolyte powder for a fuel cell according to an embodiment of the present invention.

2 is a projection electron micrograph of the electrolyte powder according to Example 1.

Figure 3 is a scanning electron microscope (SEM) photograph of the powder shape after the alcohol washing (a) and after drying (b) of the electrolyte powder according to Example 1.

4 is a scanning electron micrograph of a sintered body sintered with an electrolyte powder according to Example 1;

5 is a scanning electron micrograph of a sintered compact molded and sintered into an electrolyte powder according to Example 2;

6 is an EDS analysis spectrum of a sintered body sintered from an electrolyte powder according to Example 1;

7 is an EDS analysis spectrum of the sintered body sintered with the electrolyte powder according to Example 2. FIG.

8 is an EDS analysis spectrum of a sintered body sintered from an electrolyte powder according to Example 3. FIG.

Claims (12)

A precursor for preparing a precursor aqueous solution by mixing a ceria precursor and a rare earth metal precursor in a mass corresponding to a molar ratio of the following formula and dissolving it in distilled water while adding polyethylene glycol (PEG) at a volume ratio of 0.002 to 0.006 based on the total volume of the distilled water. Preparing an aqueous solution; Ultrasonic treatment step of preparing an aqueous electrolyte solution by adding a hydroxide in a volume ratio of 0.2 to 0.5 based on the total volume of the distilled water while performing an ultrasonic treatment to the precursor aqueous solution An electrolyte gel manufacturing step of preparing the electrolyte solution into an electrolyte gel, and Method for producing an electrolyte powder for a fuel cell, characterized in that it comprises an electrolyte powder manufacturing step of preparing the electrolyte powder by washing and drying the electrolyte gel with alcohol. <Formula> X _a Ce _b O _c Where X is a rare earth metal, a = 0.01 to 0.4, b = 1-a, c = 2b + 3a / 2 The method of claim 1, The ceria precursor is a fuel cell electrolyte powder manufacturing method, characterized in that the nitrate (nitrate) or chloride (chloride) containing cerium. 3. The method of claim 2, The nitrate of the ceria precursor is Ce (NO ₃ ) ₃ · H ₂ O characterized in that the fuel powder electrolyte powder manufacturing method. The method of claim 1, The rare earth metal is at least any one selected from the group consisting of Sm, Pr, Eu, Gd, La, Tb, Dy, Ho, Er, Tm and Lu. The method of claim 1, The rare earth metal precursor is a fuel cell electrolyte powder manufacturing method, characterized in that the nitrate (chloride) or chloride containing a rare earth metal. The method of claim 5, The nitrate of the rare earth metal precursor is Gd (NO ₃ ) ₃ H ₂ O or Sm (NO ₃ ) ₃ · H ₂ O characterized in that the manufacturing method of the electrolyte powder for fuel cells. The method of claim 1, The polyethylene glycol is a method for producing an electrolyte powder for a fuel cell, characterized in that PEG 200, PEG 400 or PEG 600. The method of claim 1, The ultrasonic treatment is a fuel, characterized in that the process temperature of the precursor aqueous solution for injecting the hydroxide into the precursor aqueous solution is maintained at a temperature of 30 ℃ to 99 ℃, the process time for adding the hydroxide to the precursor aqueous solution is at least 30 minutes Battery electrolyte powder production method. The method of claim 1, The hydroxide is a fuel cell electrolyte powder manufacturing method, characterized in that at least any one selected from NaOH and KOH or a mixture thereof. The method of claim 1, The electrolyte powder manufacturing step further comprises an electrolyte powder grinding step of grinding the electrolyte powder to a nano size. The method of claim 10, The electrolyte powder grinding step is a method for producing an electrolyte powder for a fuel cell, characterized in that the ball milling (ball milling), attrition milling (attrition milling) or jet milling (zet milling). An electrolyte powder for a fuel cell prepared by the fuel cell electrolyte powder manufacturing method according to any one of claims 1 to 11.

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