JP6649641B2 - 固体電解質及び全固体電池 - Google Patents
固体電解質及び全固体電池 Download PDFInfo
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- 239000007784 solid electrolyte Substances 0.000 title claims description 94
- 239000007787 solid Substances 0.000 title description 5
- 239000000203 mixture Substances 0.000 claims description 30
- 229910052708 sodium Inorganic materials 0.000 claims description 9
- 229910052749 magnesium Inorganic materials 0.000 claims description 8
- 229910052758 niobium Inorganic materials 0.000 claims description 8
- 229910052720 vanadium Inorganic materials 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 26
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 23
- 239000002994 raw material Substances 0.000 description 16
- 239000000395 magnesium oxide Substances 0.000 description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 14
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 14
- 239000002245 particle Substances 0.000 description 14
- 229910004298 SiO 2 Inorganic materials 0.000 description 13
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 13
- 239000000377 silicon dioxide Substances 0.000 description 13
- 235000012239 silicon dioxide Nutrition 0.000 description 13
- 229910000029 sodium carbonate Inorganic materials 0.000 description 13
- 229910001928 zirconium oxide Inorganic materials 0.000 description 13
- 229910020335 Na3 PO4.12H2 O Inorganic materials 0.000 description 11
- ASTWEMOBIXQPPV-UHFFFAOYSA-K trisodium;phosphate;dodecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[Na+].[O-]P([O-])([O-])=O ASTWEMOBIXQPPV-UHFFFAOYSA-K 0.000 description 11
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 9
- 229910002076 stabilized zirconia Inorganic materials 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 6
- 239000010955 niobium Substances 0.000 description 6
- -1 phosphate compound Chemical class 0.000 description 5
- 229910019142 PO4 Inorganic materials 0.000 description 4
- 239000010452 phosphate Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910000528 Na alloy Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 2
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 235000019837 monoammonium phosphate Nutrition 0.000 description 2
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Inorganic materials O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 description 2
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 description 2
- 229910021314 NaFeO 2 Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- GWBWGPRZOYDADH-UHFFFAOYSA-N [C].[Na] Chemical compound [C].[Na] GWBWGPRZOYDADH-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000012856 weighed raw material Substances 0.000 description 1
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Description
リン酸ナトリウム12水和物(Na3PO4・12H2O)、炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、二酸化ケイ素(SiO2)などの原料を、表1に示す条件を満たす一般式が得られる組成となるように適宜秤量した。次に、秤量した原料粉末とエタノールとφ2mmの玉石とを、ポリエチレン製ポリポットに封入してポット架上で回転させ、原料を混合した。次に、90℃に熱したホットプレートの上で原料を加熱することにより、エタノールを除去した。その後、原料を、空気雰囲気下、1100℃で8時間焼成することにより、揮発成分を除去し、仮焼成物を得た。次に、得られた仮焼成物とエタノールとφ2mmの玉石とをジルコニア製ポットに封入して、遊星ボールミル装置でポットを回転させて仮焼成物を粉砕した。その後、90℃のホットプレート上に仮焼成物を配置して加熱することにより、エタノールを除去し、仮焼粉砕粉を得た。次に、得られた仮焼粉砕粉を、50kN/cm2の圧力下において、φ10mm×厚み500μm〜1000μmの錠剤に成形した。次に、空気雰囲気下において1100℃〜250℃で10時間焼成し、下記の表1に記載の比較例1の組成を有する固体電解質タブレットを得た。
リン酸ナトリウム12水和物(Na3PO4・12H2O)、炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、二酸化ケイ素(SiO2)、酸化マグネシウム(MgO)などの原料を、表1に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表1に記載の実施例1の組成を有する固体電解質タブレットを得た。
炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、リン酸二水素アンモニウム(NH4H2PO4)、二酸化ケイ素(SiO2)、酸化バナジウム(V2O5)などの原料を、表1に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表1に記載の実施例2の組成を有する固体電解質タブレットを得た。
炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、リン酸二水素アンモニウム(NH4H2PO4)、二酸化ケイ素(SiO2)、五酸化ニオブ(Nb2O5)などの原料を、表1に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表1に記載の実施例3の組成を有する固体電解質タブレットを得た。
リン酸ナトリウム12水和物(Na3PO4・12H2O)、炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、二酸化ケイ素(SiO2)、酸化イットリウム(Y2O3)、イットリウム安定化ジルコニア(YSZ)などの原料を、表2に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表2に記載の比較例2の組成を有する固体電解質タブレットを得た。得られた固体電解質タブレットのナイキストプロットを図2に示す。
リン酸ナトリウム12水和物(Na3PO4・12H2O)、炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、二酸化ケイ素(SiO2)、酸化イットリウム(Y2O3)、イットリウム安定化ジルコニア(YSZ)、酸化マグネシウム(MgO)などの原料を、表2に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表2に記載の実施例4の組成を有する固体電解質タブレットを得た。
リン酸ナトリウム12水和物(Na3PO4・12H2O)、炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、二酸化ケイ素(SiO2)、酸化イットリウム(Y2O3)、イットリウム安定化ジルコニア(YSZ)、五酸化バナジウム(V2O5)などの原料を、表2に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表2に記載の実施例5の組成を有する固体電解質タブレットを得た。得られた固体電解質タブレットのナイキストプロットを図2に示す。
リン酸ナトリウム12水和物(Na3PO4・12H2O)、炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、二酸化ケイ素(SiO2)、酸化イットリウム(Y2O3)、イットリウム安定化ジルコニア(YSZ)、五酸化ニオブ(Nb2O5)などの原料を、表2に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表2に記載の実施例6の組成を有する固体電解質タブレットを得た。得られた固体電解質タブレットのナイキストプロットを図2に示す。
リン酸ナトリウム12水和物(Na3PO4・12H2O)、炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、二酸化ケイ素(SiO2)、酸化イットリウム(Y2O3)、イットリウム安定化ジルコニア(YSZ)、酸化マグネシウム(MgO)などの原料を、表3に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表3に記載の実施例7の組成を有する固体電解質タブレットを得た。
リン酸ナトリウム12水和物(Na3PO4・12H2O)、炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、二酸化ケイ素(SiO2)、酸化イットリウム(Y2O3)、イットリウム安定化ジルコニア(YSZ)、酸化マグネシウム(MgO)などの原料を、表3に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表3に記載の実施例8の組成を有する固体電解質タブレットを得た。
リン酸ナトリウム12水和物(Na3PO4・12H2O)、炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、二酸化ケイ素(SiO2)、酸化イットリウム(Y2O3)、イットリウム安定化ジルコニア(YSZ)、酸化マグネシウム(MgO)などの原料を、表3に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表3に記載の実施例9の組成を有する固体電解質タブレットを得た。得られた固体電解質タブレットのナイキストプロットを図2に示す。
リン酸ナトリウム12水和物(Na3PO4・12H2O)、炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、二酸化ケイ素(SiO2)、酸化イットリウム(Y2O3)、イットリウム安定化ジルコニア(YSZ)、酸化マグネシウム(MgO)などの原料を、表3に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表3に記載の実施例10の組成を有する固体電解質タブレットを得た。
リン酸ナトリウム12水和物(Na3PO4・12H2O)、炭酸ナトリウム(Na2CO3)、酸化ジルコニウム(ZrO2)、二酸化ケイ素(SiO2)、酸化イットリウム(Y2O3)、イットリウム安定化ジルコニア(YSZ)、酸化マグネシウム(MgO)などの原料を、表3に示す条件を満たす一般式が得られる組成となるように適宜秤量したこと以外は、比較例1と同様にして、下記の表3に記載の比較例3の組成を有する固体電解質タブレットを得た。得られた固体電解質タブレットのナイキストプロットを図2に示す。
実施例1〜10、比較例1〜3のそれぞれにおいて作製した固体電解質タブレットのイオン伝導度を以下のように測定した。
11 正極
12 負極
13 固体電解質層
Claims (6)
- Naを伝導種とするNaSICON型の固体電解質であって、
Na、Zr、Y、M、Si、P及びO(Mは、Mg、V及びNbからなる群より選ばれた少なくとも一つの元素である)を含み、
MとZrとのモル比が、M/Zr<0.2である組成を有する、固体電解質。 - 一般式Na3+x(Zr1−yYy)2−zMzSi2PO12(Mは、Mg、V及びNbからなる群より選ばれた少なくとも一つの元素であり、x:−0.2<x<0.8、y:0<y≦0.12、z:0<z≦0.3)で表される、請求項1に記載の固体電解質。
- 0.05≦z≦0.3である、請求項1又は2に記載の固体電解質。
- 0.1≦z≦0.3である、請求項3に記載の固体電解質。
- 0.1≦z≦0.15である、請求項4に記載の固体電解質。
- 請求項1〜5のいずれか一項に記載の固体電解質を含む固体電解質層と、
前記固体電解質層の一方面に焼結によって接合されている正極と、
前記固体電解質層の他方面に焼結によって接合されている負極と、
を備える、全固体電池。
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