A solid electrolyte material having high ion conductivity and a all-solid-state lithium-ion secondary battery using this solid electrolyte material are provided. The solid electrolyte material has a garnet-related structure crystal represented by the chemical composition Li.sub.7xyLa.sub.3Zr.sub.2xyTa.sub.xNb.sub.yO.sub.12 (0.05x+y0.2, x0, y0), which belongs to an orthorhombic system and a space group belonging to Ibca. The solid electrolyte material has lithium-ion conductivity at 25 C. of at least 1.010.sup.4 S/cm. Also, in this solid electrolyte material, the lattice constants are 1.29 nma1.32 nm, 1.26 nmb1.29 nm, and 1.29 nmc1.32 nm, and three 16f sites and one 8d site in the crystal structure are occupied by lithium-ions. The all-solid-state lithium-ion secondary battery has a positive electrode, a negative electrode, and a solid electrolyte, the solid electrolyte comprising this solid electrolyte material.

There is provided a hydrogen-substituted garnet-type oxide containing at least Li, H, La and Zr and has an amount of hydrogen a (moll unit) per one unit of a garnet-type oxide in a range of 1.85.

A solid state ionic conductive electrolyte membrane may include a garnet-like structure oxide material. A solid state ionic conductive electrolyte membrane may include a multi-channel porous support structure and a solid state ionic conductive electrolyte in the multi-channel porous support structure. Systems and methods for selectively extracting alkaline metals include the solid state ionic conductive electrolyte membrane.

An all-solid-state battery having a positive electrode, a negative electrode having a negative electrode active material layer, and a solid electrolyte layer between the positive electrode and the negative electrode material layer. The negative electrode active material layer contains 60% by volume or more of an oxide having a LISICON-type crystal structure. The solid electrolyte layer contains a solid electrolyte having at least one of an oxide having a garnet-type crystal structure or an oxide having a LISICON-type crystal structure.

A device including an LED light source optically coupled to a green-emitting U.sup.6+-doped phosphor having a composition selected from the group consisting of U.sup.6+-doped phosphate-vanadate phosphors, U.sup.6+-doped halide phosphors, U.sup.6+-doped oxyhalide phosphors, U.sup.6+-doped silicate-germanate phosphors, U.sup.6+-doped alkali earth oxide phosphors, and combinations thereof, is presented. The U.sup.6+-doped phosphate-vanadate phosphors are selected from the group consisting of compositions of formulas (A1)-(A12). The U.sup.6+-doped halide phosphors are selected from the group consisting of compositions for formulas (B1)-(B3). The U.sup.6+-doped oxyhalide phosphors are selected from the group consisting of compositions of formulas (C1)-(C5). The U.sup.6+-doped silicate-germanate phosphors are selected from the group consisting of compositions of formulas (D1)-(D11). The U.sup.6+-doped alkali earth oxide phosphors are selected from the group consisting of formulas (E1)-(E11).

An electrolyte according to the present disclosure contains a lithium composite metal oxide represented by the following compositional formula.

Li.sub.7-xLa.sub.3(Zr.sub.2-xA.sub.x)O.sub.12-yF.sub.y

In the formula, 0.1x1.0, 0.0<y1.0, and A represents two or more types of Ta, Nb, and Sb.

The embodiments herein relate to electrochromic stacks, electrochromic devices, and methods and apparatus for making such stacks and devices. In various embodiments, an anodically coloring layer in an electrochromic stack or device is fabricated to include nickel-tungsten-niobium-oxide (NiWNbO). This material is particularly beneficial in that it is very transparent in its clear state.

Doped titanium niobate is provided, which has a chemical structure of Ti.sub.(1-x)M1.sub.xNb.sub.(2-y)M2.sub.yO.sub.(7-z)Q.sub.z or Ti.sub.(2-x)M1.sub.xNb.sub.(10-y)M2.sub.yO.sub.(29-z)Q.sub.z, wherein M1 is Li, Mg, or a combination thereof; M2 is Fe, Mn, V, Ni, Cr, or a combination thereof; Q is F, Cl, Br, I, S, or a combination thereof; 0x0.15; 0y0.15; 0.01z2; 0x0.3; 0y0.9; and 0.01z8.

A mixed conductor represented by Formula 1:

A.sub.4+xM.sub.5-yM.sub.yO.sub.12-,Formula 1

wherein, in Formula 1, A is a monovalent cation, M is at least one of a divalent cation, a trivalent cation, or a tetravalent cation, M is at least one of a monovalent cation, a divalent cation, a trivalent cation, a tetravalent cation, a pentavalent cation, or a hexavalent cation, M and M are different from each other, and 0.3x<3, 0.01<y<2, and 01 are satisfied.

A production method of a battery active material of the present embodiment includes a step of obtaining a coprecipitated product containing Ti and Nb by mixing a solution with a pH of 5 or lower, in which a Ti compound is dissolved, and a solution with a pH of 5 or lower, in which a Nb compound is dissolved, such that molar ratio of Ti and Nb (Nb/Ti) is adjusted within a range of 1Nb/Ti28, and then further mixing with an alkali solution with a pH of 8 or higher; and a step of burning the coprecipitated product under condition of 635 C. or higher and 1200 C. or lower.