Solid electrolyte, electrode, power storage device, and method for producing solid electrolytes
A solid electrolyte of the present disclosure includes: a porous dielectric having a plurality of pores interconnected mutually; and an electrolyte including a metal salt and at least one selected from the group consisting of an ionic compound and a bipolar compound and at least partially filling an interior of the plurality of pores. Inner surfaces of the plurality of pores of the porous dielectric are at least partially modified by a functional group containing a halogen atom.
1. A solid electrolyte, comprising:
a porous dielectric having a plurality of pores interconnected mutually; and
an electrolyte comprising a metal salt and at least one selected from the group consisting of an ionic compound and a bipolar compound and at least partially filling an interior of the plurality of pores, wherein
inner surfaces of the plurality of pores of the porous dielectric are at least partially modified by a functional group containing a halogen atom, and
the halogen atom is a chlorine atom.
2. The solid electrolyte according to claim 1 , wherein the chlorine atom is present at the end of the functional group.
3. The solid electrolyte according to claim 1 , further comprising a surface adsorption layer adsorbed to the inner surfaces of the plurality of pores to induce polarization.
4. The solid electrolyte according to claim 1 , wherein
the electrolyte comprises a polarization layer adsorbed to the inner surface of the pore of the porous dielectric or an inner surface of the surface adsorption layer,
the polarization layer comprises a first ion layer, a second ion layer, and a third ion layer,
the first ion layer is a layer comprising a plurality of first ions bonded to the porous dielectric or the surface adsorption layer,
the plurality of first ions each have a first polarity,
the second ion layer is a layer comprising a plurality of second ions bonded to the plurality of first ions,
the plurality of second ions each have a second polarity being a polarity opposite to the first polarity,
the third ion layer is a layer comprising a plurality of third ions bonded to the plurality of second ions, and
the plurality of third ions each have the first polarity.
5. The solid electrolyte according to claim 4 , wherein
the plurality of first ions are each an anion derived from the ionic compound or the metal salt,
the plurality of second ions are each a cation derived from the ionic compound, and
the plurality of third ions are each an anion derived from the ionic compound or the metal salt.
6. The solid electrolyte according to claim 1 , wherein the metal salt is a lithium salt.
7. The solid electrolyte according to claim 6 , wherein the lithium salt comprises lithium bis(trifluoromethanesulfonyl)imide.
8. The solid electrolyte according to claim 1 , wherein the ionic compound is an ionic liquid.
9. The solid electrolyte according to claim 8 , wherein the ionic liquid comprises a bis(trifluoromethanesulfonyl)imide anion.
10. The solid electrolyte according to claim 9 , wherein the ionic liquid comprises 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide.
11. The solid electrolyte according to claim 1 , wherein the porous dielectric is porous silica.
12. The solid electrolyte according to claim 1 , wherein
the porous dielectric forms a single layer, and
an outer boundary of the solid electrolyte is defined by the porous dielectric.
13. An electrode, comprising:
the solid electrolyte according to claim 1 ; and
an electrode active material.
14. The electrode according to claim 13 , further comprising at least one selected from a conductive auxiliary agent and a binder.
15. A power storage device, comprising:
a positive electrode; and
a negative electrode, wherein
at least one selected from the positive electrode and the negative electrode is the electrode according to claim 13 .
16. A power storage device, comprising:
a positive electrode;
a negative electrode; and
the solid electrolyte according to claim 1 .
17. A method for producing the solid electrolyte described in claim 1 , comprising:
mixing a precursor of a porous dielectric, at least one selected from the group consisting of an ionic compound and a bipolar compound, a metal salt, water, and an organic solvent to prepare a liquid mixture;
causing gelation of the liquid mixture to form a gel mixture; and
drying the gel mixture to form the solid electrolyte, wherein
the precursor comprises a functional group containing a halogen atom, and
the halogen atom is a chlorine atom.
18. The method for producing the solid electrolyte according to claim 17 , wherein the precursor comprises a metal alkoxide having the functional group containing a chlorine atom.
19. The method for producing the solid electrolyte according to claim 18 , wherein the metal alkoxide having the functional group containing a chlorine atom is a silicon alkoxide having the functional group containing the chlorine atom.