Solid electrolyte having magnesium ion conductivity and magnesium secondary battery using the same
A solid electrolyte has a composition represented by the formula: Mg x SiO y N z , where 1<x<2, 3<y<5, and 0≤z<1. The solid electrolyte is an amorphous material.
1. A solid electrolyte:
having a composition represented by a formula: Mg x SiO y N z , where 1<x<2, 3<y<5, and 0≤z<1; and
being an amorphous material.
2. The solid electrolyte according to claim 1 , wherein
z satisfies 0≤z<1.
3. The solid electrolyte according to claim 1 , wherein
z is 0.
4. The solid electrolyte according to claim 1 , wherein
x satisfies 1.5<x<2.
5. The solid electrolyte according to claim 1 , wherein
y satisfies 3.5<y<4.5.
6. The solid electrolyte according to claim 2 , wherein
z satisfies 0<z<0.5.
7. The solid electrolyte according to claim 1 , wherein
the solid electrolyte is a film having a thickness of 100 nm or more and 20 μm or less.
8. A secondary battery comprising:
a positive electrode containing a positive electrode active material;
a negative electrode containing a negative electrode active material; and
the solid electrolyte according to claim 1 .
9. The secondary battery according to claim 8 , wherein
z satisfies 0<z<1.
10. The secondary battery according to claim 8 , wherein
z is 0.
11. The secondary battery according to claim 8 , wherein
x satisfies 1.5<x<2.
12. The secondary battery according to claim 8 , wherein
y satisfies 3.5<y<4.5.
13. The secondary battery according to claim 9 , wherein
z satisfies 0<z<0.5.
14. The secondary battery according to claim 8 , wherein
the solid electrolyte is a film having a thickness of 100 nm or more and 20 μm or less.
15. The secondary battery according to claim 8 , wherein
the positive electrode, the solid electrolyte, and the negative electrode are stacked.
16. The secondary battery according to claim 8 , further comprising:
an electrolytic solution filling the space between the positive electrode and the negative electrode and containing a nonaqueous solvent and a magnesium salt dissolved in the nonaqueous solvent, wherein
the solid electrolyte covers the positive electrode.
17. The secondary battery according to claim 16 , wherein
the positive electrode includes a positive electrode active material layer containing a plurality of positive electrode active material particles; and
the solid electrolyte is disposed as a single layer collectively covering the plurality of the positive electrode active material particles.
18. The secondary battery according to claim 17 , wherein
the positive electrode active material layer has an irregular surface defined by the plurality of the positive electrode active material particles; and
the solid electrolyte is disposed along the irregular surface.
19. The secondary battery according to claim 16 , wherein
the positive electrode includes a positive electrode active material layer containing a plurality of positive electrode active material particles; and
the solid electrolyte is composed of a plurality of coats individually covering the plurality of the positive electrode active material particles.