Solid electrolyte, solid electrolyte layer and solid electrolyte battery
A solid electrolyte includes a compound composed of an alkali metal, at least one metal element selected from Zr, Hf, Ti, Sn, Mg, Ca, Sr, Cs, Ba, Y, Al, Sc, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Cu, Ag, Au, Pb, Bi, In, Sn, Sb, Nb, Ta and W and an element belonging to Group XVII of the periodic table.
1 . A solid electrolyte comprising a compound represented by the following formula (1),
A 2+a E 1-b+α G b X d (1)
where:
A is one element selected from the group consisting of Li, K and Na,
E is at least one element selected from the group consisting of Zr, Hf, Ti and Sn,
X is Cl
a is zero in a case where G is not contained,
b is zero,
−0.3≤α≤0.3, and
5.7≤d≤5.8.
2 . The solid electrolyte according to claim 1 ,
wherein, in the compound represented by the formula (1), A is Li, E is Zr, and X is Cl.
3 . The solid electrolyte according to claim 1 ,
wherein the compound represented by the formula (1) is a compound represented by the following formula (2),
Li 2 ZrCl d-e I e (2)
where:
5.7≤d≤5.8, and
e is zero.
4 . The solid electrolyte according to claim 1 , further comprising:
0.05 to 1.0 mass % of at least one compound selected from the group consisting of:
A 2 O, where A is one element selected from the group consisting of Li, K and Na;
AX, where A is one element selected from the group consisting of Li, K and Na, and X is at least one selected from the group consisting of F, Cl, Br and I;
EO 2 , where E is at least one element selected from the group consisting of Zr, Hf, Ti and Sn;
EX 4 , where E is at least one element selected from the group consisting of Zr, Hf, Ti and Sn, and X is at least one selected from the group consisting of F, Cl, Br and I; and
GO n , where:
G is at least one element selected from the group consisting of Mg, Ca, Sr, Cs, Ba, Al, Sc, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Cu, Ag, Au, Pb, Bi, In, Sn, Sb, Nb, Ta and W, and
n is:
0.5 in a case where G is a monovalent element,
1 in a case where G is a divalent element,
1.5 in a case where G is a trivalent element,
2 in a case where G is a tetravalent element,
2.5 in a case where G is a pentavalent element, and
3 in a case where G is a hexavalent element.
5 . A solid electrolyte layer comprising:
the solid electrolyte according to claim 1 .
6 . A solid electrolyte battery comprising:
a solid electrolyte layer;
a positive electrode; and
a negative electrode,
wherein at least one of the solid electrolyte layer, the positive electrode and the negative electrode contains the solid electrolyte according to claim 1 .
7 . A solid electrolyte battery comprising:
a solid electrolyte layer;
a positive electrode; and
a negative electrode,
wherein the solid electrolyte layer contains the solid electrolyte according to claim 1 .
8 . A solid electrolyte comprising a compound represented by the following formula (1),
A 2+a E 1-b+α G b X d (1)
where:
A is one element selected from the group consisting of Li, K and Na,
E is at least one element selected from the group consisting of Zr, Hf, Ti and Sn,
G is Nb,
X is at least one selected from the group consisting of F, Cl, Br and I,
a is-b in a case where G is a pentavalent element, and
0≤b≤0.5,
−0.3≤α≤0.3, and
5.0<d<6.0.