WO2023079892A1 - 酸化物イオン伝導性固体電解質 - Google Patents
酸化物イオン伝導性固体電解質 Download PDFInfo
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Definitions
- the present invention relates to oxide ion conductive solid electrolytes.
- Solid electrolytes with oxide ion conductivity can be used as various electrical devices such as solid oxide fuel cells (SOFC), solid oxide electrolysis cells (SOEC), oxygen sensors, and oxygen pumps.
- SOFC solid oxide fuel cells
- SOEC solid oxide electrolysis cells
- oxygen sensors oxygen sensors
- oxygen pumps oxygen pumps
- Both SOFC and SOEC are electrochemical cells that operate at high temperatures.
- the former can handle various fuels such as hydrogen, carbon monoxide, and methane, while the latter electrolyzes the water and carbon dioxide produced by SOFC operation. It can be converted back to hydrogen and carbon monoxide.
- SOFC and SOEC have a solid electrolyte provided between two electrodes, and operate by conducting oxide ions in this solid electrolyte.
- YSZ yttria-stabilized zirconia
- ScSZ scandia-stabilized zirconia
- Mayenite-type compounds exhibit oxide ion conductivity (Non-Patent Document 1). Mayenite-type compounds have a crystal structure that contains free oxide ions within cages. Therefore, it is possible that this free oxide ion can contribute to ion conduction.
- the ionic conductivity of conventional mayenite-type compounds is not very high (for example, about 1/10 that of YSZ).
- the present invention has been made in view of such a background, and an object of the present invention is to provide a solid electrolyte having a mayenite-type compound structure and having significantly high oxide ion conductivity.
- an oxide ion conductive solid electrolyte Having a mayenite type compound having a representative composition represented by Ca 12 Al 14 O 33 , Provided is an oxide ion conductive solid electrolyte containing 1.5 mol % to 7 mol % of barium (Ba) in terms of oxide.
- the present invention can provide a solid electrolyte having a mayenite-type compound structure and having significantly high oxide ion conductivity.
- FIG. 4 is a diagram showing results of evaluation by simulation of main diffusion species in a mayenite type compound having a C12A7 structure (Ca 12 Al 14 O 33 ) containing Ba.
- 1 is a diagram schematically showing an example of the configuration of an SOFC having an oxide ion-conducting solid electrolyte according to one embodiment of the present invention
- FIG. 1 is a diagram schematically showing an example of the configuration of an SOEC having an oxide ion-conducting solid electrolyte according to one embodiment of the present invention
- FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed typically an example of the flow of the manufacturing method of the oxide ion conductive solid electrolyte by one Embodiment of this invention.
- FIG. 4 is a diagram schematically showing an example flow of another method for producing an oxide ion conductive solid electrolyte according to one embodiment of the present invention.
- an oxide ion-conducting solid electrolyte comprising: Having a mayenite type compound having a representative composition represented by Ca 12 Al 14 O 33 , Provided is an oxide ion conductive solid electrolyte containing 1.5 mol % to 7 mol % of barium (Ba) in terms of oxide.
- first solid electrolyte contains a mayenite type compound having a C12A7 structure.
- the mayenite type compound has a typical composition represented by 12CaO.7Al 2 O 3 and has a characteristic crystal structure with three-dimensionally connected voids (cages) with a diameter of about 0.4 nm.
- the framework that makes up this cage is positively charged, forming 12 cages per unit cell.
- One-sixth of this cage is occupied with oxide ions in order to satisfy the electroneutrality condition of the crystal.
- the caged oxide ions have chemically different properties from the other oxygen ions that make up the framework, and for this reason the caged oxide ions are specifically called free oxide ions.
- the mayenite type compound is also represented by the composition formula [Ca 24 Al 28 O 64 ] 4+ (O 2 ⁇ ) 2 (Non-Patent Document 2).
- the mayenite-type compound contains free oxide ions in the cage, so it may function as an oxide ion conductor (Non-Patent Document 1).
- the inventors of the present application have been earnestly conducting research and development on measures for increasing the oxide ion conductivity of mayenite-type compounds.
- the inventors of the present application have found that the ionic conductivity of the mayenite-type compound is significantly enhanced when barium (Ba) is contained in the mayenite-type compound, leading to the present invention.
- the first solid electrolyte contains barium (Ba).
- Ba is contained in the first solid electrolyte in the range of 1.5 mol % to 7 mol % in terms of oxide.
- the Ba content is preferably in the range of 2 mol % to 6 mol %, more preferably in the range of 3 mol % to 6 mol %, in terms of oxide.
- the molar ratio (Ba+Ca)/Al may be 0.875 or less.
- the first solid electrolyte contains Ba and has significantly high ionic conductivity.
- the Ba atom is preferentially substituted at the site of the Ca atom.
- Ba atoms have a larger ionic radius than Ca atoms. Therefore, when the site of the Ca atom is substituted with the Ba atom, the distance between the Ba atom and the oxide ion becomes longer. It is believed that this weakens the electrostatic attraction between the Ba atoms and the oxide ions, facilitating the movement of free oxide ions in the cage, thereby improving the ionic conductivity.
- the mechanism for improving the ionic conductivity is based on current experimental considerations, and the first solid electrolyte may have improved ionic conductivity by another mechanism.
- first solid electrolyte may further contain titanium (Ti).
- Ti may be contained in the range of 0.1 mol % to 30 mol % in terms of TiO 2 with respect to the entire first solid electrolyte.
- the Ti content is preferably 8.1 mol % or more in terms of TiO2 .
- Ti is considered to be substituted and arranged at the site of the aluminum (Al) atom of the mayenite type compound.
- a molar ratio Ti/Al of Ti atoms to Al atoms may be 0.015 ⁇ Ti/Al ⁇ 0.50.
- the molar ratio (Ba+Ca)/(Al+Ti) may be 0.875 or less.
- the ionic conductivity is further improved. This is expected for the following reasons.
- Ti When Ti is added to the mayenite type compound, it is believed that the Ti atoms are preferentially substituted and arranged at Al atom sites. However, Al atoms are trivalent, but Ti atoms are tetravalent. Therefore, when Al atoms are replaced with Ti atoms, the concentration of oxide ions increases in order to maintain electrical neutrality. In addition, it is considered that the concentration of free oxide ions in the cage increases along with this, resulting in an improvement in ionic conductivity.
- Such a first solid electrolyte has significantly higher ionic conductivity than conventional mayenite compounds. Therefore, the first solid electrolyte can be expected to be used as a solid electrolyte in electrochemical devices such as SOFC and SOEC.
- the code used for the calculation is LAMMPS. Values reported by Pedone et al. (see Non-Patent Documents 3 and 4) were used for the two-body potential of the constituent elements of each material, which is an input parameter.
- Figure 1 shows the results of the simulation.
- the horizontal axis is the elapsed time
- the vertical axis is the MSD of each element.
- FIG. 1 shows that an element with a larger MSD slope is more likely to diffuse inside the mayenite compound.
- the first solid electrolyte is stable even at high temperatures and has a significantly higher oxide ion conductivity. Therefore, the first solid electrolyte can be applied as, for example, a solid oxide fuel cell (SOFC) cell solid electrolyte and a solid electrolyte for SOEC.
- SOFC solid oxide fuel cell
- FIG. 2 schematically shows a configuration example of an SOFC cell.
- the SOFC cell 100 has an oxygen electrode 110, a fuel electrode 120, and a solid electrolyte 130 between the electrodes.
- the following reactions occur: O 2 +4e ⁇ ⁇ 2O 2 ⁇ (1)
- Oxide ions generated at the oxygen electrode 110 pass through the solid electrolyte 130 and reach the fuel electrode 120 on the opposite side.
- the following reactions occur: 2H 2 +2O 2 ⁇ ⁇ 2H 2 O+4e ⁇ Equation (2) Therefore, when the SOFC cell 100 is connected to the external load 140 , the reactions of equations (1) and (2) continue and the external load 140 can be powered.
- the first solid electrolyte can be applied as the solid electrolyte 130, for example.
- FIG. 3 schematically shows a configuration example of an SOEC cell.
- the SOEC cell 200 has an oxygen electrode 210, a fuel electrode 220, and a solid electrolyte 230 between the electrodes.
- the first solid electrolyte can be applied as the solid electrolyte 230, for example.
- the oxide ion-conducting solid electrolyte according to one embodiment of the present invention is used as an "electrolyte layer" placed between two electrodes in such an electrochemical cell, and is also used as an “electrolyte component” contained in the electrodes. can also be used as
- the solid electrolyte according to one embodiment of the present invention may be used in any form.
- a solid electrolyte according to one embodiment of the invention may be provided as a powder.
- the solid electrolyte according to an embodiment of the present invention may be provided in the form of slurry, paste or dispersion by mixing with a solvent and/or binder.
- FIG. 4 schematically shows an example flow of a method for producing an oxide ion conductive solid electrolyte according to one embodiment of the present invention (hereinafter referred to as "first production method").
- the first manufacturing method includes: (1) a step of mixing a Ca source, an Al source, and a Ba source in a predetermined ratio to obtain a mixed powder (step S110); (2) a step of calcining the mixed powder to obtain a calcined powder (step S120); (3) a step of sintering the calcined powder to obtain a sintered body (step S130); have
- Step S110 First, a mixed powder is prepared. Therefore, Ca source, Al source, and Ba source are mixed at a predetermined ratio.
- the Ca source may be selected from, for example, metallic calcium, calcium carbonate, calcium oxide, calcium hydroxide, calcium nitrate, and calcium acetate.
- the Al source may be selected from, for example, metallic aluminum, ⁇ -alumina, ⁇ -alumina, aluminum hydroxide, aluminum nitrate, and aluminum sulfate.
- the Ba source may be selected from, for example, barium carbonate.
- Each raw material is weighed and mixed so as to obtain a mayenite-type compound having the desired composition.
- the mixing method is not particularly limited as long as a uniform mixed powder can be obtained.
- Step S120 Next, the mixed powder is calcined.
- the calcination process is carried out to desorb compounds such as carbonic acid and nitric acid contained in the mixed powder, and to facilitate the formation of the desired mayenite type compound in the next sintering process.
- the calcination conditions are not particularly limited, but the calcination temperature is preferably 1000°C or higher in order to obtain the desired mixed oxide. However, if the calcining temperature is too high, crystallization will proceed excessively in the mixed powder. Therefore, the calcination temperature is preferably 1300° C. or less.
- the calcination time is, for example, about 5 hours to 24 hours. However, the calcining time varies depending on the calcining temperature, and the higher the calcining temperature, the shorter the calcining time.
- the calcined powder may be pulverized as necessary.
- the average particle size after pulverization may range, for example, from 0.1 ⁇ m to 100 ⁇ m.
- Step S130 Next, the calcined powder is sintered.
- the sintering process is carried out to obtain a dense sintered body with the desired crystal phase.
- the calcined powder Before the sintering process, the calcined powder may be molded and the sintering process may be performed using the obtained molded body.
- the molding conditions are not particularly limited, and a general molding method such as uniaxial molding or hydrostatic molding may be employed.
- the sintering method is not particularly limited.
- the calcined powder or compact may be sintered by a pressureless sintering method under normal pressure.
- the calcined powder may be sintered using a pressure sintering method such as hot press sintering or discharge plasma sintering.
- a pressure sintering method such as hot press sintering or discharge plasma sintering.
- molding and sintering may be performed at once.
- the sintering temperature is not particularly limited as long as a proper sintered body can be obtained, but is preferably in the range of 1200°C to 1400°C. If the sintering temperature is too low, a dense sintered body may not be obtained. Also, if the sintering temperature is too high, the object to be processed may melt.
- the optimum sintering time varies depending on the sintering temperature, but in the case of pressureless sintering, it is, for example, about 5 to 48 hours, and in the case of pressure sintering by discharge plasma, it is, for example, 5 minutes. ⁇ 60 minutes.
- carbon may adhere to the surface of the sintered body.
- the adhered carbon can be removed by heat-treating in the air at 800° C. to 1000° C. for about 5 hours.
- an oxide ion conductive solid electrolyte according to one embodiment of the present invention can be produced.
- FIG. 5 schematically shows an example flow of another method for producing an oxide ion conductive solid electrolyte (hereinafter referred to as "second production method") according to one embodiment of the present invention.
- the second manufacturing method includes: (1) a step of mixing a Ca source and an Al source in a predetermined ratio to obtain a first mixed powder (step S210); (2) a step of calcining the first mixed powder to obtain a first calcined powder (step S220); (3) a step of mixing the first calcined powder and the Ba source at a predetermined ratio to obtain a second mixed powder (step S230); (4) a step of calcining the second mixed powder to obtain a second calcined powder (step S240); (5) Sintering the second calcined powder to obtain a sintered body (step S250); have
- each step included in the second manufacturing method can be easily understood by a person skilled in the art from the description of each step S110 to S130 in the first manufacturing method. Therefore, detailed description of each step is omitted here.
- the oxide ion conductive solid electrolyte is manufactured through two calcination steps (steps S220 and S240).
- an oxide ion conductive solid electrolyte having a more homogeneous composition can be obtained. can be manufactured.
- highly reactive Ca and Ba may react to form a heterogeneous phase.
- step S220 in the first calcination step (step S220), calcined powder in which Ca and Al are reacted and bonded can be prepared in advance. Therefore, in the second calcination step (step S240), Ba can be introduced into desired sites in the mayenite compound more reliably.
- the method for producing an oxide ion conductive solid electrolyte according to one embodiment of the present invention has been described above using the first production method and the second production method as examples.
- the above description is merely an example, and the oxide ion conductive solid electrolyte according to one embodiment of the present invention may be produced by other methods such as a hydrothermal method, a sol-gel method, and a liquid-phase combustion method. good.
- Examples 1 to 8 are examples, and Examples 21 to 23 are comparative examples.
- Example 1 A sintered body was produced by the following method.
- sample 1 The obtained sintered body is called "Sample 1".
- the content of Ba is 1.5 mol % in terms of oxide.
- Example 2 A sintered body was produced in the same manner as in Example 1. However, in this example 2, the mixed powder was prepared by changing the compounding ratio of each raw material in the above-described [mixing step] from that in the case of example 1. Specifically, calcium carbonate powder (4.19 g), ⁇ -alumina powder (2.49 g), and barium carbonate powder (0.207 g) were weighed.
- sample 2 The obtained sintered body is called "Sample 2".
- the content of Ba is 1.6 mol % in terms of oxide, and (Ca+Ba)/Al is 0.879.
- Examples 3 to 5 A sintered body was produced in the same manner as in Example 1. However, in Examples 3 to 5, mixed powders were prepared by changing the compounding ratio of each raw material in the above-described [Preparation step] from that in Example 1. Other steps are the same as in Example 1.
- Example 3 The obtained sintered bodies are referred to as “Sample 3" to “Sample 5", respectively.
- Example 6 A sintered body was produced in the same manner as in Example 1. However, in Example 6, titanium dioxide powder was added as raw materials in addition to calcium carbonate powder, ⁇ -alumina powder, and barium oxide powder in the above-described [Preparation step]. Titanium dioxide powder was added so as to be 2.6 mol % with respect to the whole. The Ti/Al ratio in the mixed powder is 0.037.
- the obtained sintered body is called "Sample 6".
- Example 7 A sintered body was produced in the same manner as in Example 6. However, in Examples 7 and 8, mixed powders were prepared by changing the compounding ratio of each raw material from that in Example 6. Other steps are the same as in Example 6. The obtained sintered bodies are referred to as “Sample 7" to “Sample 8", respectively.
- Example 21 A sintered body was produced in the same manner as in Example 1. However, in Example 21, only calcium carbonate (4.33 g) and ⁇ -alumina (2.57 g) were mixed in the above-described [Preparation step] to prepare a mixed powder. That is, a mixed powder was prepared without adding a Ba source.
- the obtained sintered body is called "Sample 21".
- Example 22 to Example 23 A sintered body was produced in the same manner as in Example 1. However, in Examples 22 and 23, mixed powders were prepared by changing the compounding ratio of each raw material in the above-described [Preparation step] from that in Example 1.
- Example 22 The obtained sintered bodies are referred to as “Sample 22" to “Sample 23”, respectively.
- Table 1 summarizes the raw materials and firing conditions for each sample.
- each sample was polished with #80 to #1000 sandpaper to remove the surface layer and smooth it.
- a platinum electrode with a diameter of 6 mm and a thickness of 10 ⁇ m was placed on the polished surface via platinum paste. This sample was heat treated at 1000° C. for 15 minutes in an air atmosphere to solidify the platinum paste.
- the sample was placed in an electric furnace in an air atmosphere.
- the sample was also connected to a potentiogalvanostat (Biologic SP-150) via a platinum wire coupled to a platinum electrode.
- the measurement frequency was 1 MHz to 100 mHz.
- the resistivity was obtained from the intersection with the horizontal axis (real number axis).
- resistivity column in Table 1 above summarizes the results obtained for each sample.
- the resistivity of each sample is shown as a ratio of the resistivity obtained in sample 21.
- the solid electrolyte containing Ba in the crystal site of the mayenite type compound exhibits better ion conductivity than the conventional mayenite type compound.
- the present invention can have the following aspects.
- (Aspect 1) An oxide ion conductive solid electrolyte, Having a mayenite type compound having a representative composition represented by Ca 12 Al 14 O 33 , An oxide ion conductive solid electrolyte containing 1.5 mol % to 7 mol % of barium (Ba) in terms of oxide.
- (Aspect 2) The oxide ion conductive solid electrolyte according to aspect 1, wherein at least part of Ba is contained in the mayenite type compound.
- (Aspect 3) The oxide ion conductive solid electrolyte according to aspect 2, wherein the Ba is arranged at the site of the Ca atom in the mayenite compound.
- (Aspect 5) 5.
- (Aspect 6) The oxide ion conductive solid electrolyte according to aspect 5, wherein the Ti is arranged at the Al atom site in the mayenite type compound.
- An electrochemical device comprising the oxide ion conductive solid electrolyte according to any one of aspects 1 to 7.
- SOFC cell 110 oxygen electrode 120 fuel electrode 130 solid electrolyte 140 external load 200 SOEC cell 210 oxygen electrode 220 fuel electrode 230 solid electrolyte 240 external power supply
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Abstract
Description
Ca12Al14O33で表される代表組成を有するマイエナイト型化合物を有し、
バリウム(Ba)を、酸化物換算で、1.5モル%~7モル%含む、酸化物イオン伝導性固体電解質が提供される。
本発明の一実施形態では、酸化物イオン伝導性固体電解質であって、
Ca12Al14O33で表される代表組成を有するマイエナイト型化合物を有し、
バリウム(Ba)を、酸化物換算で、1.5モル%~7モル%含む、酸化物イオン伝導性固体電解質が提供される。
Baを含むC12A7構造のマイエナイト型化合物において、イオン伝導の主体となる元素をシミュレーションにより評価した。
第1の固体電解質は、高温においても安定であり、有意に高い酸化物イオン伝導性を有する。従って、第1の固体電解質は、例えば、固体酸化物型燃料電池(SOFC)セルの固体電解質、およびSOEC用の固体電解質として適用できる。
O2+4e-→2O2- (1)式
酸素極110で生じた酸化物イオンは、固体電解質130内を通り、反対側の燃料極120に達する。燃料極120では、例えば、以下の反応が生じる:
2H2+2O2-→2H2O+4e- (2)式
従って、SOFCセル100を外部負荷140に接続した場合、(1)式および(2)式の反応が継続され、外部負荷140に給電することができる。
2O2-→O2+4e- (3)式
また、燃料極220では、例えば、以下の反応が生じる:
2H2O+4e-→2H2+2O2- (4)式
燃料極220で生じた酸化物イオンは、固体電解質230内を通り、反対側の酸素極210に達する。従って、SOECセル200を外部電源240に接続した場合、(3)式および(4)式の反応が継続される。
次に、図4を参照して、本発明の一実施形態による酸化物イオン伝導性固体電解質の製造方法の一例について説明する。
(1)Ca源、Al源、およびBa源を所定の割合で混合して、混合粉末を得る工程(工程S110)と、
(2)混合粉末を仮焼して、仮焼粉を得る工程(工程S120)と、
(3)仮焼粉を焼結させて、焼結体を得る工程(工程S130)と、
を有する。
まず、混合粉末が調製される。このため、Ca源、Al源、およびBa源が所定の割合で混合される。
次に、混合粉末が仮焼される。
次に、仮焼粉が焼結される。
次に、図5を参照して、本発明の一実施形態による酸化物イオン伝導性固体電解質の別の製造方法の例について説明する。
(1)Ca源およびAl源を所定の割合で混合して、第1の混合粉末を得る工程(工程S210)と、
(2)第1の混合粉末を仮焼して、第1の仮焼粉を得る工程(工程S220)と、
(3)第1の仮焼粉およびBa源を所定の割合で混合して、第2の混合粉末を得る工程(工程S230)と、
(4)第2の混合粉末を仮焼して、第2の仮焼粉を得る工程(工程S240)と、
(5)第2の仮焼粉を焼結させて、焼結体を得る工程(工程S250)と、
を有する。
以下の方法で、焼結体を作製した。
炭酸カルシウム粉末(4.14g)と、αアルミナ粉末(2.52g)と、炭酸バリウム粉末(0.199g)とをそれぞれ秤量した。これらを、φ5mmのジルコニアボールおよび10ccのイソプロパノールが入ったポットに投入し、遊星ボールミル法により3時間粉砕混合した。次に、混合粉末を100℃で乾燥し、イソプロパノールを除去した。さらに、ふるいにより、混合粉末をジルコニアボールと分離した。
得られた混合粉末をアルミナ坩堝に入れ、大気中、1200℃で5時間仮焼した。得られた試料をメノー乳鉢で粉砕し、仮焼粉を作製した。
仮焼粉1gをφ1.5cmの超硬金属ダイスに入れ、油圧プレス器で20kNの圧力を印加し、一軸成形を実施した。さらに、196MPaで静水圧成形処理を行い、φ1.5cmのペレットを作製した。ペレットを大気中、1300℃で12時間熱処理し、φ1.3cmφ、厚さ2mmの焼結体を得た。
例1と同様の方法により、焼結体を作製した。ただし、この例2では、前述の[調合工程]における各原料の配合比を例1の場合とは変化させて、混合粉末を調製した。具体的には、炭酸カルシウム粉末(4.19g)と、αアルミナ粉末(2.49g)と、炭酸バリウム粉末(0.207g)とをそれぞれ秤量した。
例1と同様の方法により、焼結体を作製した。ただし、例3~例5では、前述の[調合工程]における各原料の配合比を例1の場合とは変化させて、混合粉末を調製した。その他の工程は、例1の場合と同様である。
例1と同様の方法により、焼結体を作製した。ただし、この例6では、前述の[調合工程]において、原料として、炭酸カルシウム粉末、αアルミナ粉末、および酸化バリウム粉末に加えて、二酸化チタン粉末を添加した。二酸化チタン粉末は、全体に対して、2.6モル%となるように添加した。混合粉末におけるTi/Al比は、0.037である。
例6と同様の方法により、焼結体を作製した。ただし、例7~例8では、各原料の配合比を例6の場合とは変化させて、混合粉末を調製した。その他の工程は、例6の場合と同様である。得られた焼結体を、それぞれ、「サンプル7」~「サンプル8」と称する。
例1と同様の方法により、焼結体を作製した。ただし、この例21では、前述の[調合工程]において、炭酸カルシウム(4.33g)とαアルミナ(2.57g)のみを混合して、混合粉末を調製した。すなわち、Ba源を添加せずに、混合粉末を調製した。
例1と同様の方法により、焼結体を作製した。ただし、例22~例23では、それぞれ、前述の[調合工程]における各原料の配合比を例1の場合とは変化させて、混合粉末を調製した。
本発明は、以下の態様を有し得る。
(態様1)
酸化物イオン伝導性固体電解質であって、
Ca12Al14O33で表される代表組成を有するマイエナイト型化合物を有し、
バリウム(Ba)を、酸化物換算で、1.5モル%~7モル%含む、酸化物イオン伝導性固体電解質。
(態様2)
前記Baの少なくとも一部は、前記マイエナイト型化合物に含有されている、態様1に記載の酸化物イオン伝導性固体電解質。
(態様3)
前記Baは、前記マイエナイト型化合物におけるCa原子のサイトに配置されている、態様2に記載の酸化物イオン伝導性固体電解質。
(態様4)
モル比で、(Ba+Ca)/(Al)≦0.875を満たす、態様1乃至3のいずれか一つに記載の酸化物イオン伝導性固体電解質。
(態様5)
さらに、チタン(Ti)を、TiO2換算で8.1モル%以上含む、態様1乃至4のいずれか一つに記載の酸化物イオン伝導性固体電解質。
(態様6)
前記Tiは、前記マイエナイト型化合物におけるAl原子のサイトに配置されている、態様5に記載の酸化物イオン伝導性固体電解質。
(態様7)
モル比で、(Ba+Ca)/(Ti+Al)≦0.875を満たす、態様5または6に記載の酸化物イオン伝導性固体電解質。
(態様8)
態様1乃至7のいずれか一つに記載の酸化物イオン伝導性固体電解質を備える電気化学デバイス。
110 酸素極
120 燃料極
130 固体電解質
140 外部負荷
200 SOECセル
210 酸素極
220 燃料極
230 固体電解質
240 外部電源
Claims (8)
- 酸化物イオン伝導性固体電解質であって、
Ca12Al14O33で表される代表組成を有するマイエナイト型化合物を有し、
バリウム(Ba)を、酸化物換算で、1.5モル%~7モル%含む、酸化物イオン伝導性固体電解質。 - 前記Baの少なくとも一部は、前記マイエナイト型化合物に含有されている、請求項1に記載の酸化物イオン伝導性固体電解質。
- 前記Baは、前記マイエナイト型化合物におけるCa原子のサイトに配置されている、請求項2に記載の酸化物イオン伝導性固体電解質。
- モル比で、(Ba+Ca)/(Al)≦0.875を満たす、請求項1または2に記載の酸化物イオン伝導性固体電解質。
- さらに、チタン(Ti)を、TiO2換算で8.1モル%以上含む、請求項1または2に記載の酸化物イオン伝導性固体電解質。
- 前記Tiは、前記マイエナイト型化合物におけるAl原子のサイトに配置されている、請求項5に記載の酸化物イオン伝導性固体電解質。
- モル比で、(Ba+Ca)/(Ti+Al)≦0.875を満たす、請求項5に記載の酸化物イオン伝導性固体電解質。
- 請求項1または2に記載の酸化物イオン伝導性固体電解質を備える電気化学デバイス。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2006129674A1 (ja) * | 2005-05-30 | 2006-12-07 | Asahi Glass Company, Limited | 導電性マイエナイト型化合物の製造方法 |
| WO2019189701A1 (ja) | 2018-03-29 | 2019-10-03 | 国立大学法人東京工業大学 | 電解セル及び電解装置 |
| WO2020175519A1 (ja) * | 2019-02-26 | 2020-09-03 | つばめBhb株式会社 | 成形焼結体および成形焼結体の製造方法 |
| JP2021182100A (ja) | 2020-05-20 | 2021-11-25 | 株式会社EdLog | 採点支援方法 |
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|---|---|---|---|---|
| WO2006129674A1 (ja) * | 2005-05-30 | 2006-12-07 | Asahi Glass Company, Limited | 導電性マイエナイト型化合物の製造方法 |
| WO2019189701A1 (ja) | 2018-03-29 | 2019-10-03 | 国立大学法人東京工業大学 | 電解セル及び電解装置 |
| WO2020175519A1 (ja) * | 2019-02-26 | 2020-09-03 | つばめBhb株式会社 | 成形焼結体および成形焼結体の製造方法 |
| JP2021182100A (ja) | 2020-05-20 | 2021-11-25 | 株式会社EdLog | 採点支援方法 |
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| XIAO YIXIN; ZHANG XIN; LI RONGRONG; ZHANG JIUXING: "Rapid Synthesis and Electric Transport Properties of (CaBa)AlOElectrides", JOURNAL OF ELECTRONIC MATERIALS, SPRINGER US, NEW YORK, vol. 49, no. 4, 17 January 2020 (2020-01-17), New York, pages 2471 - 2478, XP037040248, ISSN: 0361-5235, DOI: 10.1007/s11664-020-07947-9 * |
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