The present invention concerns specific new compounds of formula Li.sub.(2x)Na.sub.(x)MO.sub.(2y/2)F.sub.(1+y) (where 0x0.2 and 0.6y0,8 and M is a transition metal), cathode material comprising the new compounds, batteries and lithium-cells comprising said new compound or cathode material, a process for the production of the new compound and their use.

A method for preparing an ordered cross-stacked metal oxide nanowire array is provided. The method includes the following steps: conducting synthesis by using an amphiphilic diblock copolymer as a structure directing agent, tetrahydrofuran (THF) as a solvent and polyoxometalates (POMs) as an inorganic precursor, where the diblock copolymer can interact with POMs via an electrostatic force to form a core-shell cylindrical micelle in the solvent, which self-assembles to form an ordered multilayer-crossed organic-inorganic composite nanostructure during an evaporation process; the template is removed by calcination in air, thereby obtaining ordered and crossed metal oxide nanowires with various elements doping. The nanowire array material has a high specific surface area, a high crystallinity, and realizes uniform doping of heteroatoms.

A sulfide solid electrolyte represented by Formula 1 and a sodium all-solid secondary battery including the same:

Na.sub.3xP.sub.1(y1+y2)W.sub.y1M.sub.y2S.sub.4zX.sub.zFormula 1

wherein in Formula 1, M may be a trivalent element, a tetravalent element, or a combination thereof, X is a halogen atom, or a combination thereof, 0x1, 0<y150.5, 0z1, and 0y20.5, wherein if z=0, y2 is not 0.

According to one embodiment, provided is a tungsten oxide powder including primary particles having an average particle size of 100 nm or less. Each of the primary particles include a crystal phase and an amorphous phase coexisting in each primary particle.

According to one embodiment, a tungsten oxide material containing potassium is provided. The tungsten oxide material has a shape of particles including a central section and a peripheral section adjacent to the central section, and having an average particle size of 100 nm or less. A periodicity of a crystal varies between the central section and the peripheral section. In addition, a tungsten oxide powder mass for an electrochromic device including 80% by mass to 100% by mass of the tungsten oxide material is provided. Moreover, a slurry for producing an electrochromic device containing the above tungsten oxide material is provided.

The present invention relates to a process for preparing ammonium metatungstate using a reverse osmosis cell, and to a device for performing the process according to the invention.

Provided is an Anderson-type polyoxometalate including titanium (Ti) as a heteroatom in the center of the Anderson-type polyoxometalate. A method for preparing an Anderson-type polyoxometalate includes mixing a titanium precursor and a tungsten precursor to prepare a mixture, sealing the mixture in a container and heating to form a hydrothermal synthetic solution, and cooling the hydrothermal synthetic solution and then adding a solute to form an Anderson-type polyoxometalate.

A mixed ionic and electronic conductors (MIEC) material for a battery includes a combination of niobium (Nb), tungsten (W), titanium (Ti), and/or oxygen (O) forming a super-MIEC material with an increased alkali ion metal diffusivity. In one example, the MIEC material is a NbWTi-0 material with an anion-to-cation ratio ranging from about 2.33 to about 2.8 where the anion is O and the cation is Nb, W, and Ti. The MIEC material may be a coarse-grained material that includes particles consisting essentially of Nb, W, Ti, and/or O and having a dimension of at least 0.1 m. The MIEC material may have an open pore structure with pores having a pore diameter from about 2.5 to about 2.8 . The MIEC material may also include carbon (C) that coats each particle. The MIEC material may be incorporated into an anode or a cathode of a lithium-ion battery.

Disclosed is a composition for a hydrogen sulfide gas sensor containing copper, lithium and NiWO.sub.4, wherein the NiWO.sub.4 is co-doped with the copper and the lithium. Also disclosed is a method for preparing a composition for a hydrogen sulfide gas sensor, the method including steps of: (1) mixing NiO, Li.sub.2CO.sub.3, CuO and WO.sub.3 powders together at a molar ratio of 0.720 to 0.725:1.0 to 1.05:0.0120 to 0.0125:0.25 to 0.255, followed by calcination, thus preparing a powder mixture; (2) applying pressure to the powder mixture by a cold isostatic pressing process, thus preparing a green body; and (3) subjecting the green body to normal-pressure sintering.

Complex tungsten oxide particles containing a complex tungsten oxide, wherein the complex tungsten oxide is represented by a general formula: M.sub.xW.sub.yO.sub.z (where an element M is one or more selected from alkali metals, alkaline earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, 0.20x/y0.37, and 2.2z/y3.3.), the crystal system is hexagonal, when the complex tungsten oxide particles are observed via a (010) plane, the occupation ratio of the length of a side formed by a plane parallel with the c-axis among the sides surrounding the (010) plane is 60% or more.