WO2023013497A1 - ヒドリドイオン伝導体 - Google Patents
ヒドリドイオン伝導体 Download PDFInfo
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- C01B6/00—Hydrides of metals including fully or partially hydrided metals, alloys or intermetallic compounds ; Compounds containing at least one metal-hydrogen bond, e.g. (GeH3)2S, SiH GeH; Monoborane or diborane; Addition complexes thereof
- C01B6/24—Hydrides containing at least two metals; Addition complexes thereof
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- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
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- H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
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- H01M2300/0065—Solid electrolytes
- H01M2300/0068—Solid electrolytes inorganic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Definitions
- the present invention relates to hydride ion conductors.
- Hydride ions which are composed of a hydrogen atom and two electrons, are lighter than lithium ions and have many characteristics such as an ionic radius equivalent to that of fluoride ions (F ⁇ ). are attractive charge carriers.
- Non-Patent Documents 1 and 2 So far, several hydride ion conductors exhibiting high ionic conductivity have been reported (for example, Non-Patent Documents 1 and 2).
- Keiga Fukui, et al. "Characteristic fast H-ion conduction in oxygen-substituted lanthanum hydride", Nature Communications, (2019) 10: 2578 Maarten C.I. Verbraeken, et al. , "High H-ionic conductivity in barium hydride", nature materials, vol. 14, p. 95-p. 100, January, 2015
- Conventional hydride ion conductors have problems in terms of stability. That is, conventional hydride ion conductors have the problem of being rapidly decomposed when exposed to the atmospheric environment.
- the present invention has been made in view of such a background, and an object of the present invention is to provide a hydride ion conductor that is more stable in an atmospheric environment.
- a hydride ion conductor The general formula is MAMBH 4-x F x (1)
- MA is selected from the group consisting of Ca, Sr, and Ba
- MB is selected from the group consisting of Mg and Ca and, unlike MA, Hydride ion conductors are provided wherein 0 ⁇ x ⁇ 4.
- a hydride ion conductor has a BaZnF4 -type structure, A hydride ion conductor having a conductivity of 10 ⁇ 5 S/cm or more at 300° C. is provided.
- the present invention can provide a more stable hydride ion conductor in an atmospheric environment.
- FIG. 1 is a diagram schematically showing the crystal structure of a hydride ion conductor according to one embodiment of the present invention
- FIG. 1 is a reference diagram collectively showing the temperature dependence of conductivity of BaH 2 , LaH 1.92 O 0.54 , La 0.6 Sr 1.4 LiH 1.6 O 2 , and SrMgH 4
- FIG. FIG. 2 is a diagram summarizing the temperature dependence of the conductivity of SrMgH 4-x F x -based materials, which is a type of hydride ion conductor according to one embodiment of the present invention.
- 1 is a diagram schematically showing the flow of a method for manufacturing a hydride ion conductor according to one embodiment of the present invention
- FIG. 4 is a diagram showing X-ray diffraction results after exposure to air of a hydride ion conductor (Sample 1) according to an embodiment of the present invention
- FIG. 4 is a diagram showing X-ray diffraction results before and after air exposure of a hydride ion conductor (Sample 2) according to an embodiment of the present invention
- FIG. 4 is a diagram showing X-ray diffraction results before and after air exposure of a hydride ion conductor (Sample 3) according to an embodiment of the present invention
- 4 is a graph showing the temperature dependence of conductivity of a hydrid ion conductor (Sample 2) according to one embodiment of the present invention.
- 4 is a graph showing the temperature dependence of the conductivity of a hydrid ion conductor (Sample 3) according to one embodiment of the present invention.
- a hydride ion conductor In one embodiment of the invention, a hydride ion conductor, The general formula is MAMBH 4-x F x (1) Formula is represented by here, MA is selected from the group consisting of Ca, Sr, and Ba; MB is selected from the group consisting of Mg and Ca and, unlike MA, Hydride ion conductors are provided wherein 0 ⁇ x ⁇ 4.
- a hydride ion conductor has a BaZnF4 -type structure, A hydride ion conductor having a conductivity of 10 ⁇ 5 S/cm or more at 300° C. is provided.
- a hydride ion conductor according to one embodiment of the present invention has a BaZnF4 - type structure.
- FIG. 1 schematically shows the crystal structure of BaZnF4 , which is the structure of the hydride ion conductor according to one embodiment of the present invention.
- a hydride ion conductor according to an embodiment of the present invention has significantly higher stability in an atmospheric environment than conventional hydride ion conductors.
- the hydride ion conductor according to one embodiment of the present invention does not lose its conductivity at 300°C even after being left in the atmosphere for one week.
- SrMgH4 -xFx system In the material SrMgH 4 having a BaZnF 4 -type structure, a SrMgH 4-x F x- based material is obtained by substituting a portion of the hydrogen atoms (H) with fluorine atoms (F).
- x is preferably 1 or more. Also, if the value of x is 3 or less, good conductivity of the SrMgH 4-x F x- based material can be obtained.
- Fig. 2 summarizes the temperature dependence of conductivity in various hydride ion conductors.
- FIG. 2 shows the temperature dependence of BaH 2 , LaH 1.92 O 0.54 , La 0.6 Sr 1.4 LiH 1.6 O 2 and SrMgH 4 .
- FIG. 3 summarizes the temperature dependence of the conductivity of SrMgH 4-x F x- based materials.
- (i) is SrMgH4 material
- (ii) is SrMgH3F1 material
- (iii) is SrMgH2F2 material
- (iv) is SrMgH1F3 material
- (v) is SrMgF4 material. behavior.
- the conductivity of the SrMgH 4-x F x -based material at 300° C. is preferably greater than or equal to 10 ⁇ 5 S/cm.
- BaMgH 4-x F x system In the material BaMgH 4 having a BaZnF 4 type structure, a BaMgH 4-x F 2 -based material is obtained by substituting some of the hydrogen atoms (H) with fluorine atoms (F).
- x is 3 or less.
- x is in the range of 1-3.
- FIG. 4 schematically shows the flow of the method for producing a hydrid ion conductor according to one embodiment of the present invention.
- a method for producing a hydride ion conductor comprises: (i) a step of mixing predetermined raw materials to prepare a mixed powder (step S110); (ii) heat-treating the mixed powder (step S120); have
- each step is performed under a non-air atmosphere such as an inert gas atmosphere or a hydrogen atmosphere.
- Step S110 First, raw materials are prepared.
- raw materials for example, hydrides of metal MA and MB, and fluorides of metal MA and metal MB are used.
- SrH 2 powder, MgH 2 powder, SrF 2 powder, MgF 2 powder, etc. may be used when manufacturing a SrMgH 4-x F x -based hydride ion conductor.
- BaH 2 powder, MgH 2 powder, BaF 2 powder, MgF 2 powder, etc. may be used when manufacturing a BaMgH 4-x F x -based hydride ion conductor.
- Each raw material may be sufficiently mixed using a ball mill device or the like.
- the obtained mixed powder may be molded.
- the hydride ion conductor can be provided as a molded body.
- Step S120 The resulting mixed powder is then heat treated at a high temperature to produce a hydride ion conductor.
- a cubic anvil high pressure apparatus may be used for this process.
- a cube called a pyrophyllite cell is used, and the inside of this cell is filled with mixed powder. After that, by generating ultra-high hydrostatic pressure with a cubic anvil high-pressure device, it is possible to isotropically pressurize the six surfaces of the pyrophyllite cell installed inside.
- the pressure applied to the pyrophyllite cell is, for example, in the range of 1 GPa to 6 GPa.
- the treatment temperature is, for example, in the range of 500°C to 1000°C.
- the hydride ion conductor according to one embodiment of the present invention can be produced.
- step S120 does not necessarily have to be performed. That is, the hydride ion conductor according to one embodiment of the present invention may be provided in the form of mixed powder.
- the above manufacturing method is merely an example, and the hydride ion conductor according to one embodiment of the present invention may be manufactured by another manufacturing method.
- a sample of the hydride ion conductor was prepared by the following method. Also, the characteristics of the produced samples were evaluated. In the following description, Examples 1 to 3 are examples, and Examples 11 and 12 are comparative examples.
- Example 1 A sample for evaluation was produced by the following method.
- the particle size of the SrH 2 powder is 0.1-200 ⁇ m
- the particle size of the MgH 2 powder is 0.1-200 ⁇ m
- the particle size of the MgF 2 powder is 0.1-200 ⁇ m.
- H:F 3:1 (molar ratio).
- the obtained mixed powder was put into a planetary ball mill device (containing zirconia balls) and ground and mixed at room temperature.
- the rotation speed was 600 rpm, and the treatment time was 48 hours.
- sample 1 a hydride ion conductor
- Example 2 A hydride ion conductor was produced in the same manner as in Example 1. However, in Example 2, H:F in the mixed powder was 2:2 (molar ratio). Other conditions are the same as in Example 1.
- sample 2 a hydride ion conductor (hereinafter referred to as “sample 2”) was produced.
- Example 3 A hydride ion conductor was produced in the same manner as in Example 1. However, in Example 3, H:F in the mixed powder was 1:3 (molar ratio). Other conditions are the same as in Example 1.
- sample 3 a hydride ion conductor
- Example 11 A hydride ion conductor was produced in the same manner as in Example 1. However, in Example 11, a mixed powder was prepared without adding MgF 2 powder. The composition of the mixed powder is SrMgH4 in stoichiometric ratio. Other conditions are the same as in Example 1.
- sample 11 a hydride ion conductor (hereinafter referred to as “sample 11") was produced.
- Example 12 A sample was prepared in the same manner as in Example 1. However, in Example 11, 1.337 g of SrF 2 powder and 0.663 g of MgF 2 powder were weighed and mixed in an Ar atmosphere to prepare a mixed powder. No hydride was added to the feed. The composition of the mixed powder is stoichiometric SrMgF4 . Other conditions are the same as in Example 1.
- Example 12 a sample (hereinafter referred to as “Sample 12") was produced.
- X-ray diffraction analysis X-ray diffraction analysis of each sample was performed using a desktop X-ray diffraction analyzer (MiniFlex600; manufactured by RIGAKU). The measurement before exposure to air was performed in an argon atmosphere, and the measurement after exposure to air was performed in an air atmosphere.
- AC impedance measurement Each sample was molded to produce a compact having a diameter of about 6 mm ⁇ and a thickness of about 2 mm. Gold electrodes were brought into contact with both bottom surfaces of this compact, and AC impedance was measured using an atmosphere control measurement cell.
- the VSP-300 (Biologic Inc.) was used as the measurement device.
- the measurement frequency was 1 Hz to 7 MHz, and the applied AC voltage was 50 to 500 mV. Measurements were performed in a hydrogen atmosphere. Conductivity was calculated from the measurement results (cole-cole-plot).
- Sample 11 began to decompose immediately after being exposed to the atmosphere, and deteriorated very quickly.
- Samples 1 to 3 started to deteriorate later than Sample 11 and were relatively stable.
- Samples 2 and 3 showed almost no deterioration even after one week of exposure to the atmosphere.
- FIG. 5 shows the X-ray diffraction analysis results of Sample 1.
- 6 and 7 show the X-ray diffraction analysis results of samples 2 and 3, respectively.
- the X-ray diffraction analysis results of Sample 1 were measured one hour after being exposed to the atmosphere.
- the X-ray diffraction analysis results of samples 2 and 3 were measured one week after opening to the atmosphere. It should be noted that sample 11 could not be subjected to X-ray diffraction analysis because it started to decompose immediately after being exposed to the atmosphere.
- Figures 6 and 7 simultaneously show the results of X-ray diffraction analysis before opening to the atmosphere.
- FIG. 3 shows the temperature dependence of the conductivity obtained in Sample 1 before being exposed to the atmosphere.
- FIG. 3 shows the temperature dependence of the conductivity obtained in Sample 2 before opening to the atmosphere, and (iv) in FIG. The temperature dependence of the obtained conductivity is shown.
- FIG. 3 shows the temperature dependence of the conductivity obtained in the sample 11 before opening to the atmosphere, and (v) in FIG. temperature dependence of degrees.
- the conductivity at each temperature was lowest in sample 12, and increased in order of sample 3, sample 2, sample 1, and sample 11.
- FIG. 8 shows the temperature dependence of conductivity obtained after sample 2 was exposed to the atmosphere. For comparison, FIG. 8 also shows the results measured before atmospheric exposure (ie curve (iii) in FIG. 3).
- Sample 2 maintained high conductivity even after being exposed to the atmosphere.
- the conductivity at 300° C. after atmospheric exposure was about 10 ⁇ 7.0 S/cm.
- FIG. 9 shows the temperature dependence of conductivity obtained after sample 3 was exposed to the atmosphere.
- FIG. 9 also shows the results measured before atmospheric exposure (that is, curve (iv) in FIG. 3).
- Sample 3 maintained high conductivity even after being exposed to the atmosphere.
- the conductivity at 300° C. after atmospheric exposure was about 10 ⁇ 4.5 S/cm.
- samples 1 to 3 were confirmed to have better atmospheric stability than sample 11.
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Abstract
Description
ヒドリドイオン伝導体であって、
一般式が
MAMBH4-xFx (1)式
で表され、
ここで、
MAは、Ca、Sr、およびBaからなる群から選定され、
MBは、MgおよびCaからなる群から選定され、MAとは異なり、
0<x<4である、ヒドリドイオン伝導体が提供される。
ヒドリドイオン伝導体であって、
BaZnF4型構造を有し、
300℃における伝導度が10-5S/cm以上である、ヒドリドイオン伝導体が提供される。
本発明の一実施形態では、
ヒドリドイオン伝導体であって、
一般式が
MAMBH4-xFx (1)式
で表され、
ここで、
MAは、Ca、Sr、およびBaからなる群から選定され、
MBは、MgおよびCaからなる群から選定され、MAとは異なり、
0<x<4である、ヒドリドイオン伝導体が提供される。
ヒドリドイオン伝導体であって、
BaZnF4型構造を有し、
300℃における伝導度が10-5S/cm以上である、ヒドリドイオン伝導体が提供される。
次に、前述のような特徴を有する本発明の一実施形態によるヒドリドイオン伝導体の具体例について説明する。
BaZnF4型構造を有する材料SrMgH4において、水素原子(H)の一部をフッ素原子(F)に置換することにより、SrMgH4-xFx系材料が得られる。SrMgH4-xFx系材料は、前述の(1)式において、MA=Sr、MB=Mgとした場合に相当する。
BaZnF4型構造を有する材料BaMgH4において、水素原子(H)の一部をフッ素原子(F)に置換することにより、BaMgH4-xFx系材料が得られる。BaMgH4-xFx系材料は、前述の(1)式において、MA=Ba、MB=Mgとした場合に相当する。
以下、図4を参照して、本発明の一実施形態によるヒドリドイオン伝導体の製造方法について、簡単に説明する。
(i)所定の原料を混合して、混合粉末を調製する工程(工程S110)と、
(ii)混合粉末を熱処理する工程(工程S120)と、
を有する。
まず、原料が準備される。
次に、得られた混合粉末が高温で熱処理され、ヒドリドイオン伝導体が製造される。
この装置を使用する際には、パイロフィライトセルと呼ばれる立方体が使用され、このセルの内部に混合粉末が充填される。その後、キュービックアンビル高圧装置により、超高圧の静水圧を発生させることにより、内部に設置されたパイロフィライトセルの6面を等方的に加圧することができる。
以下の方法により、評価用のサンプルを作製した。
Ar雰囲気下において、1.338gのSrH2粉末(三津和化学社製)と、0.197gのMgH2粉末(和光純薬社製)と、0.465gのMgF2粉末(三津和化学社製)とを秤量、混合し、混合粉末を調製した。
例1と同様の方法により、ヒドリドイオン伝導体を作製した。ただし、この例2では、混合粉末におけるH:Fは、2:2(モル比)とした。その他の条件は、例1と同様である。
例1と同様の方法により、ヒドリドイオン伝導体を作製した。ただし、この例3では、混合粉末におけるH:Fは、1:3(モル比)とした。その他の条件は、例1と同様である。
例1と同様の方法により、ヒドリドイオン伝導体を作製した。ただし、この例11では、MgF2粉末を添加せずに、混合粉末を調製した。混合粉末の組成は、化学量論比のSrMgH4である。その他の条件は、例1と同様である。
例1と同様の方法により、サンプルを作製した。ただし、この例11では、Ar雰囲気下において、1.337gのSrF2粉末と、0.663gのMgF2粉末とを秤量、混合し、混合粉末を調製した。原料に、水素化物は添加しなかった。混合粉末の組成は、化学量論比のSrMgF4である。その他の条件は、例1と同様である。
(大気暴露試験)
製造後の各サンプルを、相対湿度が50~60%の大気環境下に暴露し、サンプルの状態を観察した。
卓上X線回折分析装置(MiniFlex600;RIGAKU社製)を用いて、各サンプルのX線回折分析を行った。なお、大気暴露前の測定は、アルゴン雰囲気で実施し、大気暴露後の測定は、大気雰囲気で実施した。
各サンプルを成形して、直径約6mmφ、厚さ約2mmの成形体を作製した。この成形体の両底面に金電極を接触させ、雰囲気制御測定セルを用いて交流インピーダンス測定を実施した。
各サンプルにおいて得られた評価結果をまとめて以下の表1に示す。
Claims (3)
- ヒドリドイオン伝導体であって、
一般式が
MAMBH4-xFx (1)式
で表され、
ここで、
MAは、Ca、Sr、およびBaからなる群から選定され、
MBは、MgおよびCaからなる群から選定され、MAとは異なり、
0<x<4である、ヒドリドイオン伝導体。 - ヒドリドイオン伝導体であって、
BaZnF4型構造を有し、
300℃における伝導度が10-5S/cm以上である、ヒドリドイオン伝導体。 - 一般式がSrMgH4-xFxまたはBaMgH4-xFxで表される、請求項1または2に記載のヒドリドイオン伝導体。
Priority Applications (4)
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| CN202280053825.2A CN117794849A (zh) | 2021-08-06 | 2022-07-27 | 氢负离子导体 |
| EP22852920.2A EP4382479A4 (en) | 2021-08-06 | 2022-07-27 | HYDRIDE ION CONDUCTOR |
| JP2023540285A JPWO2023013497A1 (ja) | 2021-08-06 | 2022-07-27 | |
| US18/427,393 US20240166513A1 (en) | 2021-08-06 | 2024-01-30 | Hydride ion conductor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011204632A (ja) * | 2010-03-26 | 2011-10-13 | Tokyo Institute Of Technology | ヒドリドイオン導電体およびその製造方法 |
| JP2017098067A (ja) * | 2015-11-24 | 2017-06-01 | 国立大学法人東京工業大学 | ヒドリドイオン導電体およびその製造方法 |
| JP2021130271A (ja) | 2020-02-20 | 2021-09-09 | 大日本印刷株式会社 | 熱転写シート |
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| JP5152822B2 (ja) * | 2007-02-06 | 2013-02-27 | 独立行政法人産業技術総合研究所 | Mg−M−H系水素吸蔵合金及びその製造方法 |
| CN102530872B (zh) * | 2010-12-08 | 2013-06-12 | 中国科学院金属研究所 | 多元金属氨硼烷化合物储氢材料及其制备和复合放氢方法 |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011204632A (ja) * | 2010-03-26 | 2011-10-13 | Tokyo Institute Of Technology | ヒドリドイオン導電体およびその製造方法 |
| JP2017098067A (ja) * | 2015-11-24 | 2017-06-01 | 国立大学法人東京工業大学 | ヒドリドイオン導電体およびその製造方法 |
| JP2021130271A (ja) | 2020-02-20 | 2021-09-09 | 大日本印刷株式会社 | 熱転写シート |
Non-Patent Citations (4)
| Title |
|---|
| EMILIO ORGAZ; JESÚS HERNÁNDEZ‐TRUJILLO: "Chemical bonding in ternary magnesium hydrides", INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, WILEY, NEW YORK, NY, US, vol. 94, no. 3, 5 June 2003 (2003-06-05), US , pages 150 - 164, XP071302581, ISSN: 0020-7608, DOI: 10.1002/qua.10621 * |
| KEIGA FUKUI ET AL.: "Characteristic fast H- ion conduction in oxygen-substituted lanthanum hysride", NATURE COMMUNICATIONS, vol. 10, 2019, pages 2578 |
| MAARTEN C. VERBRAEKEN ET AL., HIGH H- IONIC CONDUCTIVITY IN BARIUMU HYDRIDE'', NATURE MATERIALS, vol. 14, January 2015 (2015-01-01), pages 95 - 100 |
| See also references of EP4382479A4 |
Also Published As
| Publication number | Publication date |
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| CN117794849A (zh) | 2024-03-29 |
| US20240166513A1 (en) | 2024-05-23 |
| EP4382479A1 (en) | 2024-06-12 |
| JPWO2023013497A1 (ja) | 2023-02-09 |
| EP4382479A4 (en) | 2025-07-23 |
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