Proton-conducting solid electrolyte, electrolyte layer, and battery

A proton-conducting solid electrolyte represented by a general formula:

• BaA1-xMxO3-δHy,
• wherein A is an element having an ionic radius of 0.52 to 0.97 Å, excluding Ce, In, Zr, and Zn,
• M is an element having an ionic radius of 70% to 130% of the ionic radius of A, excluding A, Zr, Ce, and Zn, or a mixed formulation of a plurality of elements having an average ionic radius of 70% to 130% of the ionic radius of A, excluding A and Zn,
• x is more than 0 and less than 1 (here, in a case where M is Ge, Sn, or Hf, x is more than 0 and less than 0.95, and in a case where M is a mixed element including Ti and any of Cr, Fe, Mn, Co, or Ni, a ratio of Cr, Fe, Mn, Co, or Ni in M is more than 0.2 and less than 1 or x is more than 0.2 and less than 1),
• y is 0 to 1, and
• δ is 0 to ½.

A proton-conducting solid electrolyte represented by a general formula:

• BaSc1-xMxO3-δHy,
• wherein M represents a mixed formulation of a plurality of elements excluding Sc, Zr, Ce, and Zn, in which an average ionic radius of M is 70% to 130% of an ionic radius of Sc,
• x is more than 0 and 1 or less (here, in a case where M is Ge, Sn, or Hf, x is more than 0 and less than 0.95, and in a case where M is a mixed element including Ti and any of Cr, Fe, Mn, Co, or Ni, a ratio of Cr, Fe, Mn, Co, or Ni in M is more than 0.2 and less than 1 or x is more than 0.2 and less than 1),
• y is 0 to 1, and
• δ is 0 to ½.

A proton-conducting solid electrolyte represented by a general formula:

• BaA1-x-zM1xMzO3-δHy, in which z is more than 0 and less than 1, y is 0 to 1, and δ is 0 to ½,
• wherein the proton-conducting solid electrolyte is any of the following (28) to (35),
• (28) a proton-conducting solid electrolyte represented by a general formula:
• BaSc1-x-zMoxMzO3-δHy, in which x is more than 0 and ⅓ or less, and M is an element having an ionic radius of 70% to 130% of an ionic radius of Sc, excluding Sc, Mo, and Zn, or a mixed formulation of a plurality of elements having an average ionic radius of 70% to 130% of the ionic radius of Sc, excluding Sc, Mo, and Zn (here, in a case where M is Ce, a range of x=0.01 to 0.2 or a range of z=0.74 to 0.84 is excluded),
• (29) a proton-conducting solid electrolyte represented by a general formula:
• BaSc1-x-zGexMzO3-δHy, in which x is more than 0 and less than 1, and M is an element having an ionic radius of 70% to 130% of an ionic radius of Sc, excluding Sc, Ge, and Zn, or a mixed formulation of a plurality of elements having an average ionic radius of 70% to 130% of the ionic radius of Sc, excluding Sc, Ge, and Zn,
• (30) a proton-conducting solid electrolyte represented by a general formula:
• BaSc1-x-zNbxMzO3-δHy, in which x is more than 0 and ½ or less, and M is an element having an ionic radius of 70% to 130% of an ionic radius of Sc, excluding Sc, Nb, and Zn, or a mixed formulation of a plurality of elements having an average ionic radius of 70% to 130% of the ionic radius of Sc, excluding Sc, Nb, and Zn (here, in a case where M is Ce, a range of x=0.01 to 0.2 or a range of z=0.74 to 0.84 is excluded),
• (31) a proton-conducting solid electrolyte represented by a general formula:
• BaSc1-x-zTaxMzO3-δHy, in which x is more than 0 and ½ or less, and M is an element having an ionic radius of 70% to 130% of an ionic radius of Sc, excluding Sc, Ta, and Zn, or a mixed formulation of a plurality of elements having an average ionic radius of 70% to 130% of the ionic radius of Sc, excluding Sc, Ta, and Zn (here, in a case where M is Ce, a range of x=0.01 to 0.2 or a range of z=0.74 to 0.84 is excluded),
• (32) a proton-conducting solid electrolyte represented by a general formula:
• BaSc1-x-zVxMzO3-δHy, in which x is more than 0 and ½ or less, and M is an element having an ionic radius of 70% to 130% of an ionic radius of Sc, excluding Sc, V, and Zn, or a mixed formulation of a plurality of elements having an average ionic radius of 70% to 130% of the ionic radius of Sc, excluding Sc, V, and Zn (here, in a case where M is Ce, a range of x=0.01 to 0.2 or a range of z=0.74 to 0.84 is excluded),
• (33) a proton-conducting solid electrolyte represented by a general formula:
• BaSc1-x-zWxMzO3-δHy, in which x is more than 0 and ⅓ or less, and M is an element having an ionic radius of 70% to 130% of an ionic radius of Sc, excluding Sc, W, and Zn, or a mixed formulation of a plurality of elements having an average ionic radius of 70% to 130% of the ionic radius of Sc, excluding Sc, W, and Zn (here, in a case where M is Ce, a range of x=0.01 to 0.2 or a range of z=0.74 to 0.84 is excluded),
• (34) a proton-conducting solid electrolyte represented by a general formula:
• BaSc1-x-zCexMzO3-δHy, in which x is more than 0 and less than 1, and M is an element having an ionic radius of 70% to 130% of an ionic radius of Sc, excluding Sc, Ce, Zr, and Zn, or a mixed formulation of a plurality of elements having an average ionic radius of 70% to 130% of the ionic radius of Sc, excluding Sc, Ce, and Zn (here, in a case where z is 0, x is more than 0 and less than 0.2, in a case where M is Cr, Fe, Mn, Co, or Ni, a range of x=0.01 to 0.02 is excluded, and in a case where M is Mo, Nb, Ta, V, W, or Sb, a range of z=0.01 to 0.2 or a range of x=0.74 to 0.84 is excluded), and
• (35) a proton-conducting solid electrolyte represented by a general formula:
• BaSc1-x-zSbxMzO3-δHy, in which x is more than 0 and ½ or less, and M is an element having an ionic radius of 70% to 130% of an ionic radius of Sc, excluding Sc, Sb, and Zn, or a mixed formulation of a plurality of elements having an average ionic radius of 70% to 130% of the ionic radius of Sc, excluding Sc, Sb, and Zn (here, in a case where M is Ce, a range of x=0.01 to 0.2 or a range of z=0.74 to 0.84 is excluded).