A battery comprising an acidified metal oxide (“AMO”) material, preferably in monodispersed nanoparticulate form 20 nm or less in size, having a pH<7 when suspended in a 5 wt % aqueous solution and a Hammett function H.sub.0>−12, at least on its surface.

Proposed are a layered Group III-V antimony compound, a Group III-V nanosheet that may be prepared using the same, and an electrical device including the materials. There is proposed a layered compound having a composition represented by [Formula 1] M.sub.x−mA.sub.ySb.sub.z (Where M is at least one of Group I elements, A is at least one of Group III elements, x, y, and z are positive numbers which are determined according to stoichiometric ratios to ensure charge balance when m is 0, and 0<m<x).

A battery comprising an acidified metal oxide (“AMO”) material, preferably in monodisperse nanoparticulate form 20 nm or less in size, having a pH<7 when suspended in a 5 wt % aqueous solution and a Hammett function H.sub.0>−12, at least on its surface.

A mixed conductor represented by Formula 1:
A.sub.4±xTi.sub.5−yG.sub.zO.sub.12−δ  Formula 1 wherein, in Formula 1, A is a monovalent cation, G is at least one of a monovalent cation, a divalent cation, a trivalent cation, a tetravalent cation, a pentavalent cation, or a hexavalent cation, with the proviso that G is not Ti or Cr, wherein 0<x<2, 0.3<y<5, 0<z<5, and 0<δ≤3.

The present disclosure provides a thermoelectric conversion material having a composition represented by a chemical formula of Ba.sub.1-a-b-cSr.sub.bCa.sub.cK.sub.aMg.sub.2Bi.sub.2-dSb.sub.d. In the chemical formula, the following relationships are satisfied: 0.002≤a≤0.1, 0≤b, 0≤c, a+b+c≤1, and 0≤d≤2. In addition, the thermoelectric conversion material has a La.sub.2O.sub.3-type crystal structure.

A battery cell having an anode or cathode comprising an acidified metal oxide (“AMO”) material, preferably in monodisperse nanoparticulate form 20 nm or less in size, having a pH<7 when suspended in a 5 wt % aqueous solution and a Hammett function H.sub.0>−12, at least on its surface.

Production method for metal oxide fine particles includes: a step of mixing a fatty acid represented by C.sub.nH.sub.2nO.sub.2 (n=5 to 14) and a metal source consisting of a metal, metal oxide, or metal hydroxide of at least two metal elements selected from the group consisting of Zn, In, Sn, and Sb to obtain a mixture; a step of heating the mixture at a temperature that is equal to or higher than a melting temperature of the fatty acid and lower than a decomposition temperature of the fatty acid to obtain a metal soap which is a precursor of metal oxide fine particles; and a step of heating the precursor at a temperature that is equal to or higher than a melting temperature of the precursor and lower than a decomposition temperature of the precursor to obtain metal oxide fine particles having an average particle diameter of 80 nm or less.

Production method for metal oxide fine particles includes: a step of mixing a fatty acid represented by C.sub.nH.sub.2nO.sub.2 (n=5 to 14) and a metal source consisting of a metal, metal oxide, or metal hydroxide of at least two metal elements selected from the group consisting of Zn, In, Sn, and Sb to obtain a mixture; a step of heating the mixture at a temperature that is equal to or higher than a melting temperature of the fatty acid and lower than a decomposition temperature of the fatty acid to obtain a metal soap which is a precursor of metal oxide fine particles; and a step of heating the precursor at a temperature that is equal to or higher than a melting temperature of the precursor and lower than a decomposition temperature of the precursor to obtain metal oxide fine particles having an average particle diameter of 80 nm or less.

A precursor composition for a solid electrolyte is provided that is capable of achieving a high lithium ion conductivity even if the precursor composition is sintered at a temperature of 1000° C. or lower. The precursor composition for the solid electrolyte is a precursor composition for a garnet-type or garnet-like solid electrolyte containing Li, La, Zr, and M, wherein the M is one or more types of elements selected from Nb, Ta, and Sb, the compositional ratio of Li:La:Zr:M in the solid electrolyte is 7-x:3:2-x:x, a relationship of 0<x<2.0 is satisfied, and the precursor composition exhibits X-ray diffraction intensity peaks at diffraction angles 2θ of 28.4°, 32.88°, 47.2°, 56.01°, and 58.73° in an X-ray diffraction pattern.

The present disclosure provides a thermoelectric conversion material having a composition represented by a chemical formula of Ba.sub.1-a-b-cSr.sub.bCa.sub.cK.sub.aMg.sub.2Bi.sub.2-dSb.sub.d. In the chemical formula, the following relationships are satisfied: 0.002≤a≤0.1, 0≤b, 0≤c, a+b+c≤1, and 0≤d≤2. In addition, the thermoelectric conversion material has a La.sub.2O.sub.3-type crystal structure.