Abstract: A solid electrolyte for an all-solid-state sodium battery, represented by formula: Na3?xSb1?x?xS4, wherein ? is selected from elements that provide Na3?xSb1?x?xS4 exhibiting a higher ionic conductivity than Na3SbS4, and x is 0<x<1.

Abstract: The present invention addresses the problem of providing a countermeasure against deposition of an alkali metal in cases where the alkali metal is used as a negative electrode. The above-described problem is solved by a negative electrode composite body that contains: a negative electrode active material which contains, as main components, Li and an element M that is solid soluble in Li; and a substance X which has a higher redox potential than the negative electrode active material, or a substance X which does not have electrode activity.

Abstract: An object is to provide an electrode active material having a novel structure, said electrode active material enabling Li2S to be used as an electrode. The problem is solved by a solid solution with an antifluorite crystal structure comprising Li, Cu, and S as main constituents.

Abstract: An object is to provide an electrode active material that can provide an alkali metal battery having a longer charge/discharge life and a higher capacity. The problem is solved by means of an electrode active material for an alkali metal battery, represented by formula: Aa1MSa2Xa3 wherein A is selected from Li and Na; M is selected from V, Nb, Ta, Ti, Zr, Hf, Cr, Mo, and W which are group 4 to 6 elements; X is selected from F, Cl, Br, I, CO3, SO4, NO3, BH4, BF4, PF6, ClO4, CF3SO3, (CF3SO2)2N, (C2F5SO2)2N, (FSO2)2N, and [B(C2O4)2]; a1 is 1 to 9; a2 is 2 to 6; when a3 is 3 and a3 is 0, a2 is not 4; and when M does not include V, a3>0.

Abstract: An amorphous oxide-based positive electrode active material that is a production material of a positive electrode for an all-solid secondary battery, wherein the amorphous oxide-based positive electrode active material (i) comprises an alkali metal selected from Li and Na; a second metal selected from Co, Ni, Mn, Fe, Cr, V, Cu, Ti, Zn, Zr, Nb, Mo, Ru and Sn; an ionic species selected from phosphate ion, sulfate ion, borate ion, silicate ion, aluminate ion, germanate ion, nitrate ion, carbonate ion and halide ion; and an oxygen atom (except for the oxygen atom constituting the ionic species); (ii) contains at least an amorphous phase; and (iii) is a production material of a positive electrode with a thickness of 20 ?m or more.

Abstract: A solid electrolyte for all-solid sodium battery expressed by Na3-xSbS4-xAx, wherein A is selected from F, Cl, Br, I, NO3, BH4, BF4, PF6, ClO4, BH4, CF3SO3, (CF3SO2)2N, (C2F5SO2)2N, (FSO2)2N, and [B(C2O4)2]; and x is 0<x<3.

Abstract: A solid electrolyte for an all-solid-state sodium battery, represented by formula: Na3?xSb1?x?xS4, wherein ? is selected from elements that provide Na3?xSb1?x?xS4 exhibiting a higher ionic conductivity than Na3SbS4, and x is 0<x<1.

Abstract: A solid electrolyte for all-solid sodium battery expressed by Na3-xSbS4-xAx, wherein A is selected from F, Cl, Br, I, NO3, BH4, BF4, PF6, ClO4, BH4, CF3SO3, (CF3SO2)2N, (C2F5SO2)2N, (FSO2)2N, and [B(C2O4)2]; and x is 0<x<3.

Abstract: A positive electrode for an all-solid secondary battery, comprising a positive electrode active material expressed by A2S.AX, wherein A is an alkali metal; and X is selected from I, Br, Cl, F, BF4, BH4, SO4, BO3, PO4, O, Se, N, P, As, Sb, PF6, AsF6, ClO4, NO3, CO3, CF3SO3, CF3COO, N(SO2F)2 and N(CF3SO2)2.

Abstract: A forming solution for forming a layer containing a solid electrolyte for an all-solid-state alkali metal secondary battery comprising a component derived from A2S and MxSy (A is selected from Li and Na; M is selected from P, Si, Ge, B, Al and Ga; and x and y are a number that gives a stoichiometric ratio in accordance with a species of M) as a starting material for manufacturing the solid electrolyte, a nonpolar organic solvent and a polar organic solvent having a polarity value higher than that of the nonpolar organic solvent by 0.3 or more.

Abstract: An amorphous oxide-based positive electrode active material that is a production material of a positive electrode for an all-solid secondary battery, wherein the amorphous oxide-based positive electrode active material (i) comprises an alkali metal selected from Li and Na; a second metal selected from Co, Ni, Mn, Fe, Cr, V, Cu, Ti, Zn, Zr, Nb, Mo, Ru and Sn; an ionic species selected from phosphate ion, sulfate ion, borate ion, silicate ion, aluminate ion, germanate ion, nitrate ion, carbonate ion and halide ion; and an oxygen atom (except for the oxygen atom constituting the ionic species); (ii) contains at least an amorphous phase; and (iii) is a production material of a positive electrode with a thickness of 20 ?m or more.

Abstract: An ion conductive glass ceramics having the formula Na2S—P2S5, wherein the Na2S in the ion conductive glass ceramics is contained in an amount of from 70 to 75 mole %, and wherein the ion conductive glass ceramics has a state where crystal parts are dispersed in the glass ingredient of an amorphous state and where the crystal parts contain tetragonal Na3PS4.

Abstract: A positive electrode for an all-solid secondary battery, comprising a positive electrode active material expressed by A2S.AX, wherein A is an alkali metal; and X is selected from I, Br, Cl, F, BF4, BH4, SO4, BO3, PO4, O, Se, N, P, As, Sb, PF6, AsF6, ClO4, NO3, CO3, CF3SO3, CF3COO, N(SO2F)2 and N(CF3SO2)2.

Abstract: An ion conductive glass ceramics having the formula Na2S—P2S5, wherein the Na2S in the ion conductive glass ceramics is contained in an amount of from 70 to 75 mole %, and wherein the ion conductive glass ceramics has a state where crystal parts are dispersed in the glass ingredient of an amorphous state and where the crystal parts contain tetragonal Na3PS4.

Abstract: An ion conducting glass-ceramics represented by the general formula (I): Na2S-MxSy—NaSb, wherein M and N are different and selected from P, Si, Ge, B, Al and Ga; x, y, a and b are integers indicating the stoichiometric ratio depending on the species of M and N; and the content of Na2S is more than 60 mol % and less than 80 mol %.

Abstract: An all-solid-state secondary cell is provided comprising at least a positive electrode, a negative electrode and a solid electrolyte layer which is positioned between the positive electrode and the negative electrode. The positive electrode contains a positive electrode active material consisting of Na2Sx (x=1 to 8) and the solid electrolyte layer contains an ion conductive glass ceramics represented by a formula (I): Na2S-MxSy, wherein M is P, Si, Ge, B or Al; x and y each is an integer giving a stoichiometric ratio depending upon the type of M; and Na2S is contained in an amount of more than 67 mole % and less than 80 mole %.

Abstract: A sulfide solid electrolyte with excellent ion conductivity and a method for producing a crystallized glass contained in the sulfide solid electrolyte. A sulfide solid electrolyte comprising a crystallized glass represented by the following chemical formula yLi2S•(100-x-y)P2S5•xP2O5, wherein 0<x<25 and 67<y<80.

Abstract: A forming solution for forming a layer containing a solid electrolyte for an all-solid-state alkali metal secondary battery comprising a component derived from A2S and MxSy (A is selected from Li and Na; M is selected from P, Si, Ge, B, Al and Ga; and x and y are a number that gives a stoichiometric ratio in accordance with a species of M) as a starting material for manufacturing the solid electrolyte, a nonpolar organic solvent and a polar organic solvent having a polarity value higher than that of the nonpolar organic solvent by 0.3 or more.

Abstract: A solid electrolyte material for an all solid-state lithium secondary battery represented by Li2S-MIaSb-MIIxOy, wherein MI is selected from P, Si, Ge, B and Al; “a” and “b” respectively represent numbers that give a stoichiometric ratio in accordance with the kind of MI; MII is selected from Fe, Zn and Bi; and “x” and “y” respectively represent numbers that give a stoichiometric ratio in accordance with the kind of MII.

Abstract: The main object of the present invention is to provide a sulfide solid electrolyte material with less hydrogen sulfide generation amount. The present invention solves the above-mentioned problem by providing a sulfide solid electrolyte material using a raw material composition containing Li2S and sulfide of an element of the group 14 or the group 15 in the periodic table, containing substantially no cross-linking sulfur and Li2S.