WO2013146765A1 - 固体電解質、固体電解質の製造方法、固体電解質積層体、固体電解質積層体の製造方法及び燃料電池 - Google Patents
固体電解質、固体電解質の製造方法、固体電解質積層体、固体電解質積層体の製造方法及び燃料電池 Download PDFInfo
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- the solid electrolyte one having oxygen ion conductivity or proton conductivity is employed.
- oxygen ions are combined with hydrogen at the fuel electrode to produce water, which dilutes the fuel and reduces efficiency.
- the above-mentioned BZY has excellent chemical stability, but has poor sinterability as a polycrystalline material, and since the crystal grains are small, the ratio of crystal grain boundaries is increased to inhibit proton conductivity, and the total electrical conductivity There was a problem that became low. For this reason, the BZY has not been effectively used so far.
- the amount of yttrium added is less than 15 mol%, the change in the coefficient of thermal expansion is relatively small, and problems due to thermal expansion rarely occur.
- the amount of yttrium added exceeds 20 mol%, it becomes difficult to uniformly disperse yttrium, and the ionic conductivity also decreases.
- the lattice constant at room temperature correlates with the amount of yttrium added and the change in the lattice constant near 400 ° C. Therefore, by setting the lattice constant at room temperature in the above range, the lattice constant near 400 ° C. can be estimated and the thermal expansion coefficient of the solid electrolyte can be grasped. Further, when the stacked electrode layers are sintered, peeling or the like can be prevented.
- the above-described solid electrolyte laminate is manufactured by a manufacturing method including the following steps. For example, a first pulverizing step in which BaCO 3 , ZrO 2 , and Y 2 O 3 are mixed and pulverized, and the pulverized mixture (first mixture) is heat-treated at a predetermined temperature for a predetermined time.
- the blending amounts of BaCO 3 , ZrO 2 and Y 2 O 3 are not particularly limited as long as the yttrium addition amount is 15 to 20 mol%.
- the amount of yttrium added is 15 mol%
- a material in which BaCO 3 is 62 wt%, ZrO 2 is 33 wt%, and Y 2 O 3 is 5 wt% can be used.
- a solid electrolyte laminate is formed by performing a step and an electrode material sintering step of heating the laminate on which the electrode material is formed to a predetermined temperature to sinter the electrode layer.
- An anode electrode-solid electrolyte sintering step in which the laminate (first laminate) formed in the solid electrolyte lamination step is heat-treated at a temperature of 1400 ° C. to 1600 ° C. for at least 20 hours in an oxygen atmosphere;
- a third heat treatment step is performed in which the laminate after the anode electrode-solid electrolyte sintering step is held for a predetermined time at a temperature lower than that of the anode electrode-solid electrolyte sintering step.
- the solid electrolyte according to the present invention is suitable for various types of fuel cells used in a temperature range of 600 ° C. or lower, but can also be used for fuel cells used at temperatures of 600 ° C. or higher.
- a pasting step for pasting the pulverized product and a solid electrolyte stacking step for stacking the pasted pulverized product on one side of the anode electrode molded body are performed.
- the thickness can be set as small as 10 ⁇ m to 100 ⁇ m.
- the said solid electrolyte lamination process can be performed by the screen printing method etc.
- a solid electrolyte made of yttrium-added barium zirconate that can be applied to a fuel cell that operates at a temperature of 600 ° C. or lower because of good sintering properties and high proton conductivity can be provided.
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Abstract
Description
図1に示すように、燃料電池を構成する固体電解質積層体1は、固体電解質層2と、この固体電解質層2の一側に積層形成された第1の電極層であるアノード電極層3と、他側に形成された第2の電極層であるカソード電極層4とを備えて構成される。
Claims (13)
- 水素イオン導電性を有するイットリウム添加ジルコン酸バリウムからなり、
イットリウム添加量が、15~20mol%であるとともに、100℃~1000℃における格子定数の温度変化に対する増加率がほぼ一定である、固体電解質。 - 100℃~1000℃における格子定数の温度変化に対する増加率が、3.3×10-5Å/℃~4.3×10-5Å/℃である、請求項1に記載の固体電解質。
- 前記イットリウム添加ジルコン酸バリウムは複数の結晶粒を含む多結晶体であり、前記結晶粒の平均径は1μm以上である、請求項1又は請求項2に記載の固体電解質。
- 室温での格子定数が4.218Å~4.223Åである、請求項1から請求項3のいずれか1項に記載の固体電解質。
- 400℃~800℃における、プロトン伝導度が1mS/cm~60mS/cmである、請求項1から請求項4のいずれか1項に記載の固体電解質。
- 請求項1から請求項5のいずれか1項に記載した固体電解質から形成された固体電解質層の両側面に電極層が積層形成された、固体電解質積層体。
- 請求項1から請求項5のいずれか1項に記載の固体電解質の製造方法であって、
BaCO3と、ZrO2と、Y2O3とを混合して粉砕することにより第1の混合物を得る第1の粉砕工程と、
前記第1の混合物を、熱処理する第1の熱処理工程と、
前記第1の熱処理工程を終えた第1の混合物を再度粉砕することにより第2の混合物を得る第2の粉砕工程と、
前記第2の混合物を圧縮成形することにより第1の成形体を得る第1の圧縮成形工程と、
前記第1の成形体を熱処理する第2の熱処理工程と、
前記第2の熱処理工程を終えた第1の成形体を粉砕することにより粉砕物を得る第3の粉砕工程と、
前記粉砕物を圧縮成形することにより第2の成形体を得る第2の圧縮成形工程と、
前記第2の成形体を、酸素雰囲気下、1400℃~1600℃の温度で、少なくとも20時間熱処理することにより焼結体を得る固体電解質焼結工程と、
前記焼結体を、前記固体電解質焼結工程より低い温度で保持する第3の熱処理工程と、を含む、固体電解質の製造方法。 - 前記第3の熱処理工程は、400℃~1000℃の温度で、5~30時間保持することにより行われる、請求項7に記載の固体電解質の製造方法。
- 前記焼結体は薄膜状であり、前記焼結体を常温まで冷却した後に、前記第3の熱処理工程が行われる、請求項7又は請求項8に記載の固体電解質の製造方法。
- 前記固体電解質焼結工程と前記第3の熱処理工程とを連続して行う、請求項7又は請求項8に記載の固体電解質の製造方法。
- 水素イオン導電性を有するイットリウム添加ジルコン酸バリウムからなる固体電解質層と、この固体電解質層の両側に設けた電極層とを備える固体電解質積層体の製造方法であって、
請求項7から請求項10のいずれか1項に記載した固体電解質の製造方法によって薄膜状の固体電解質層を形成する固体電解質層形成工程と、
前記固体電解質層の一側にアノード電極材料を積層するアノード電極材料積層工程と、
前記固体電解質層の他側にカソード電極材料を積層するカソード電極材料積層工程と、
アノード電極材料およびカソード電極材料が形成された積層体を加熱して、電極材料を焼結させる電極材料焼結工程とを含む、固体電解質積層体の製造方法。 - アノード電極材料を圧縮成形してアノード電極層となるアノード電極成形体を形成するアノード電極成形工程と、
BaCO3と、ZrO2と、Y2O3とを混合して粉砕することにより第1の混合物を得る第1の粉砕工程と
前記第1の混合物を、熱処理する第1の熱処理工程と、
前記第1の熱処理工程を終えた第1の混合物を再度粉砕することにより第2の混合物を得る第2の粉砕工程と、
前記第2の混合物を圧縮成形することにより成形体を得る第1の圧縮成形工程と、
前記成形体を熱処理する第2の熱処理工程と、
前記第2の熱処理工程を終えた成形体を粉砕することにより粉砕物を得る第3の粉砕工程と、
前記粉砕物をペースト化することによりペーストを得るペースト化工程と、
前記ペーストを、前記アノード電極成形体の一側に積層することにより薄膜状の固体電解質層を含む第1の積層体を得る固体電解質積層工程と、
前記第1の積層体を、酸素雰囲気下、1400℃~1600℃の温度で、少なくとも20時間熱処理するアノード電極-固体電解質焼結工程と、
前記アノード電極-固体電解質焼結工程を終えた第1の積層体を、前記アノード電極-固体電解質焼結工程より低い温度で保持する第3の熱処理工程と、
前記第3の熱処理工程を終えた第1の積層体に含まれる固体電解質層の一側に、カソード電極材料を積層することにより第2の積層体を得るカソード電極材料積層工程と、
前記第2の積層体を前記カソード電極材料の焼結温度以上に加熱するカソード電極焼結工程とを含む、固体電解質積層体の製造方法。 - 請求項1から請求項5のいずれか1項に記載の固体電解質を備えて構成される燃料電池。
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| CN201380017143.7A CN104205451B (zh) | 2012-03-28 | 2013-03-26 | 固体电解质,固体电解质的制造方法,固体电解质层叠体,固体电解质层叠体的制造方法和燃料电池 |
| US14/387,639 US9876248B2 (en) | 2012-03-28 | 2013-03-26 | Solid electrolyte, method for manufacturing solid electrolyte, solid electrolyte laminate, method for manufacturing solid electrolyte laminate, and fuel cell |
| KR1020147029193A KR101651861B1 (ko) | 2012-03-28 | 2013-03-26 | 고체 전해질, 고체 전해질의 제조 방법, 고체 전해질 적층체, 고체 전해질 적층체의 제조 방법 및 연료 전지 |
| EP13767856.1A EP2833452B1 (en) | 2012-03-28 | 2013-03-26 | Solid electrolyte, manufacturing method for solid electrolyte, solid electrolyte laminate, manufacturing method for solid electrolyte laminate, and fuel cell |
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| JP2012074254A JP5936897B2 (ja) | 2012-03-28 | 2012-03-28 | 固体電解質、固体電解質の製造方法、固体電解質積層体及び固体電解質積層体の製造方法及び燃料電池 |
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| EP (1) | EP2833452B1 (ja) |
| JP (1) | JP5936897B2 (ja) |
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| KR20140145599A (ko) | 2014-12-23 |
| US20150044597A1 (en) | 2015-02-12 |
| EP2833452A1 (en) | 2015-02-04 |
| KR101651861B1 (ko) | 2016-08-29 |
| CN104205451A (zh) | 2014-12-10 |
| EP2833452A4 (en) | 2015-11-11 |
| JP5936897B2 (ja) | 2016-06-22 |
| CN104205451B (zh) | 2016-09-07 |
| JP2013206702A (ja) | 2013-10-07 |
| US9876248B2 (en) | 2018-01-23 |
| EP2833452B1 (en) | 2019-07-31 |
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