Abstract: An object of the present disclosure is to provide an all solid fluoride ion battery that has a favorable capacity property. The present disclosure achieves the object by providing an all solid fluoride ion battery comprising: a cathode layer, an anode layer, and a solid electrolyte layer formed between the cathode layer and the anode layer; wherein the anode layer includes a metal fluoride containing an M1 element, an M2 element, and a F element; the M1 element is a metal element that fluorination and defluorination occur at a potential, versus Pb/PbF2, of ?2.5 V or more; the M2 element is a metal element that neither fluorination nor defluorination occur at a potential, versus Pb/PbF2, of ?2.5 V or more; and the M2 element is a metal element that, when in a form of a fluoride, fluoride ion conductivity is 1×10?4 S/cm or more at 200° C.

Abstract: A main object of the present disclosure is to provide a solid electrolyte with high fluoride ion conductivity. The present disclosure achieves the object by providing a solid electrolyte to be used for a fluoride ion battery, the solid electrolyte comprising: a composition of Ce1-x-yLaxSryF3-y, in which 0<x, 0<y, and 0<x+y<1; and a crystal phase that has a Tysonite structure.

Abstract: An object of the present disclosure is to provide an all solid fluoride ion battery that has a favorable capacity property. The present disclosure achieves the object by providing an all solid fluoride ion battery comprising: a cathode layer, an anode layer, and a solid electrolyte layer formed between the cathode layer and the anode layer; wherein the anode layer includes a metal fluoride containing an M1 element, an M2 element, and a F element; the M1 element is a metal element that fluorination and defluorination occur at a potential, versus Pb/PbF2, of ?2.5 V or more; the M2 element is a metal element that neither fluorination nor defluorination occur at a potential, versus Pb/PbF2, of ?2.5 V or more; and the M2 element is a metal element that, when in a form of a fluoride, fluoride ion conductivity is 1×10?4 S/cm or more at 200° C.

Abstract: An object of the present disclosure is to provide an all solid fluoride ion battery that has a favorable capacity property. The present disclosure achieves the object by providing an all solid fluoride ion battery comprising: a cathode layer, an anode layer, and a solid electrolyte layer formed between the cathode layer and the anode layer; wherein the anode layer includes a metal fluoride containing an M1 element, an M2 element, and a F element; the M1 element is a metal element that fluorination and defluorination occur at a potential, versus Pb/PbF2, of ?2.5 V or more; the M2 element is a metal element that neither fluorination nor defluorination occur at a potential, versus Pb/PbF2, of ?2.5 V or more; and the M2 element is a metal element that, when in a form of a fluoride, fluoride ion conductivity is 1×10?4 S/cm or more at 200° C.

Abstract: A main object of the present disclosure is to provide a solid electrolyte with high fluoride ion conductivity. The present disclosure achieves the object by providing a solid electrolyte to be used for a fluoride ion battery, the solid electrolyte comprising: a composition of Ce1-x-yLaxSryF3-y, in which 0<x, 0<y, and 0<x+y<1; and a crystal phase that has a Tysonite structure.

Abstract: An object of the present disclosure is to provide a solid electrolyte material with excellent fluoride ion conductivity. The present disclosure achieves the object by providing a solid electrolyte material to be used for a fluoride ion battery, the solid electrolyte material comprising: a composition of BixM1?xF2+x, in which 0.4?x?0.9, and M is at least one kind of Sn, Ca, Sr, Ba, and Pb; and a crystal phase that has a Tysonite structure.

Abstract: A main object of the present disclosure is to provide a solid electrolyte including excellent fluoride ion conductivity. The present disclosure achieves the object by providing a solid electrolyte including fluoride ion conductivity, the solid electrolyte comprising: a crystal phase having a perovskite structure or a layered perovskite structure; the crystal phase contains A cation positioned in A site, B cation positioned in B site, and a fluoride ion; the A cation contains R1R2R3R4N+ cation (each of R1 to R4 is independently a hydrogen element or a hydrocarbon group with two or less carbon atoms) or a hydrocarbon cation with two or less carbon atoms; and the B cation contains a divalent metal cation and a monovalent metal cation.

Abstract: An object of the present disclosure is to provide an all solid fluoride ion battery that has a favorable capacity property. The present disclosure achieves the object by providing an all solid fluoride ion battery comprising: a cathode layer, an anode layer, and a solid electrolyte layer formed between the cathode layer and the anode layer; wherein the anode layer includes a metal fluoride containing an M1 element, an M2 element, and a F element; the M1 element is a metal element that fluorination and defluorination occur at a potential, versus Pb/PbF2, of ?2.5 V or more; the M2 element is a metal element that neither fluorination nor defluorination occur at a potential, versus Pb/PbF2, of ?2.5 V or more; and the M2 element is a metal element that, when in a form of a fluoride, fluoride ion conductivity is 1×10?4 S/cm or more at 200° C.

Abstract: An object of the present disclosure is to provide a solid electrolyte material with excellent fluoride ion conductivity. The present disclosure achieves the object by providing a solid electrolyte material to be used for a fluoride ion battery, the solid electrolyte material comprising: a composition of BixM1-xF2+x, in which 0.4?x?0.9, and M is at least one kind of Sn, Ca, Sr, Ba, and Pb; and a crystal phase that has a Tysonite structure.

Abstract: A secondary battery is provided with a positive electrode active material layer a containing a positive electrode active material, a negative electrode active material layer containing a negative electrode active material, an electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer, and a modification material disposed at an interface between an electrolyte material and at least one electrode active material among the positive electrode active material and the negative electrode active material, and having a higher relative permittivity than the relative permittivity of the electrolyte material.

Abstract: A secondary battery is provided with a positive electrode active material layer a containing a positive electrode active material, a negative electrode active material layer containing a negative electrode active material, an electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer, and a modification material disposed at an interface between an electrolyte material and at least one electrode active material among the positive electrode active material and the negative electrode active material, and having a higher relative permittivity than the relative permittivity of the electrolyte material.