Halide solid electrolyte material and battery including the same
A solid electrolyte material according to the present disclosure is represented by the chemical formula Li 6−4b+ab (Zr 1−a M a ) b X 6 (I). M denotes at least one element selected from the group consisting of Al, Ga, Bi, Sc, Sm, and Sb, X denotes at least one halogen element, and the two mathematical formulae 0<a<1 and 0<b<1.5 are satisfied.
1. A halide solid electrolyte material represented by the following chemical formula (I):
Li 6−4b+ab (Zr 1−a M a ) b X 6 (I)
wherein
M denotes at least one element selected from the group consisting of Al, Ga, Bi, Sc, Sm, and Sb,
X denotes at least one halogen element, and
the following mathematical formulae are satisfied:
0 <a <1, and
0 <b <1.5.
2. The halide solid electrolyte material according to claim 1 , wherein the following mathematical formula is satisfied:
0.01 ≤a ≤0.7.
3. The halide solid electrolyte material according to claim 2 , wherein M denotes Bi.
4. The halide solid electrolyte material according to claim 2 , wherein M denotes at least one element selected from the group consisting of Ga and Sb, and the following mathematical formula is satisfied:
0.01 ≤a ≤0.1.
5. The halide solid electrolyte material according to claim 2 , wherein M denotes at least one element selected from the group consisting of Al and Sm, and the following mathematical formula is satisfied:
0.01 ≤a ≤0.3.
6. The halide solid electrolyte material according to claim 2 , wherein M denotes Sc, and
the following mathematical formula is satisfied:
0.01 ≤a ≤0.5.
7. The halide solid electrolyte material according to claim 1 , wherein the following mathematical formula is satisfied:
0.05 ≤b ≤1.3.
8. The halide solid electrolyte material according to claim 7 , wherein the following mathematical formula is satisfied:
0.08 ≤b ≤1.2.
9. The halide solid electrolyte material according to claim 1 , wherein the halide solid electrolyte material is represented by the following chemical formula (II):
Li 6−4b+ab (Zr 1−a M a ) b Cl 6−x−y Br x I y (II)
wherein the following mathematical formulae are satisfied:
0 ≤x ≤6,
0 ≤y ≤6, and
( x+y )≤6.
10. The halide solid electrolyte material according to claim 9 , wherein the following mathematical formula is satisfied:
( x+y )≤2.
11. A battery comprising:
a positive electrode;
a negative electrode; and
an electrolyte layer between the positive electrode and the negative electrode,
wherein at least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the halide solid electrolyte material according to claim 1 .
12. The halide solid electrolyte material according to claim 1 , wherein
M denotes at least one element selected from the group consisting of Bi, Sc, Sm, and Sb.