Solid electrolyte and magnesium secondary battery using same
A solid electrolyte according to the present disclosure has a composition represented by Mg x Zr y (PO z ) 2 (0<x≤3.5, 0≤y<1.5, and 3≤z≤4.25), and includes an amorphous part. The composition may be represented by Mg x (PO z ) 2 (3≤x≤3.5 and 3≤z≤4.25). The composition may be represented by Mg x Zr y (PO z ) 2 (0<x<3.5, 0<y<1.5, and 3≤z≤4.25).
1. An electrode material of a magnesium secondary battery, the electrode material comprising:
an electrode active material particle of the magnesium secondary battery; and
a surface layer covering the electrode active material particle, wherein
the surface layer includes a covering material, and
the covering material includes a solid electrolyte having a composition represented by Mg x (PO z ) 2 , where 3.1≤x≤3.5 and 3≤z≤4.25, and comprising an amorphous part.
2. The electrode material of the magnesium secondary battery according to claim 1 , wherein
the electrode active material particle is a positive electrode active material particle.
3. The electrode material of the magnesium secondary battery according to claim 1 , wherein
the electrode active material particle is a negative electrode active material particle.
4. An electrode layer of a magnesium secondary battery, the electrode layer comprising the electrode material according to claim 1 .
5. An electrode layer of a magnesium secondary battery, the electrode layer comprising:
an electrode active material layer including electrode active material particles of the magnesium secondary battery; and
a surface layer that is disposed on one principal surface of the electrode active material layer and includes a covering material covering an electrode active material of the magnesium secondary battery,
wherein the covering material includes a solid electrolyte having a composition represented by Mg x (PO z ) 2 , where 3.1≤x≤3.5 and 3≤z≤4.25, and comprising an amorphous part.
6. The electrode layer of the magnesium secondary battery according to claim 5 , wherein
the electrode active material particles are positive electrode active material particles.
7. The electrode layer of the magnesium secondary battery according to claim 5 , wherein
the electrode active material particles are negative electrode active material particles.
8. An electrode of a magnesium secondary battery, the electrode comprising:
the electrode layer according to claim 4 ; and
a current collector supporting the electrode layer and being in electrical contact with the electrode layer.
9. A magnesium secondary battery comprising:
the electrode according to claim 8 ; and
an electrolyte solution containing a nonaqueous solvent and a magnesium salt dissolved in the nonaqueous solvent.
10. The electrode material of the magnesium secondary battery according to claim 1 , wherein 4<z≤4.25.