A method for preparing a solid-state electrolyte powder includes the following steps. An oxygen-free sintering process is performed at a first sintering temperature, such that a refined salt mixture forms a solid-state electrolyte powder precursor mixture. An oxygen-containing sintering process is performed at a second sintering temperature, such that the solid-state electrolyte powder precursor mixture forms a solid-state electrolyte powder, in which the second sintering temperature is higher than the first sintering temperature.

This document describes processes for preparing ceramics, especially lithium-based ceramics. The ceramics produced by this process and their use in electrochemical applications are also described as well as electrode materials, electrodes, electrolyte compositions, and electrochemical cells comprising them.

The present disclosure relates to an oxide-based solid electrolyte for low-temperature sintering process and a method of manufacturing the same, and more particularly to a low-temperature sintering process having no problem of side reaction between a positive electrode active material and an oxide-based solid electrolyte through use of a low-melting point dissimilar oxide and a method of manufacturing an all-solid-state battery including a positive electrode manufactured thereby.

The disclosure relates to porous garnet ribbons and methods of making such porous garnet ribbons.

Some embodiments of the present invention provide solid oxide cells and components thereof having a metal oxide electrolyte that exhibits enhanced ionic conductivity. Certain of those embodiments have two materials, at least one of which is a metal oxide, disposed so that at least some interfaces between the domains of the materials orient in a direction substantially parallel to the desired ionic conductivity.

A lithium ion conductor includes a compound of Formula 1:

Li.sub.7−a*α−(b−4)*β−xM.sup.αLa.sub.3Zr.sub.2−βM.sup.b.sub.βO.sub.12−x−δX.sub.xN.sub.δ  Formula 1 wherein in Formula 1, M.sup.a is a cationic element having a valence of a, M.sup.b is a cationic element having a valence of b, and X is an anion having a valence of −1, wherein, when M.sup.a comprises H, 0≤α≤5, otherwise 0≤a≤0.75, and wherein 0≤β≤1.5, 0≤x≤1.5, (a*α+(b-4)β+x)>0, and 0<δ≤6.

Disclosed is a scandia-stabilized zirconia electrolyte for a solid oxide fuel cell, which is configured such that at least one oxide selected from among gadolinium oxide (Gd.sub.2O.sub.3) and samarium oxide (Sm.sub.2O.sub.3) is co-doped with ytterbium oxide (Yb.sub.2O.sub.3) to thus improve stability in a reducing atmosphere. The scandia-stabilized zirconia electrolyte of the invention can be stabilized into a cubic crystal structure at room temperature while retaining the inherently high oxygen ionic conductivity of a scandia-stabilized zirconia electrolyte (11ScSZ), and can also ensure stability in a reducing atmosphere by solving the problem with a conventional ceria (CeO.sub.2)-doped scandia-stabilized zirconia in which the ionic conductivity continuously deteriorates in a reducing atmosphere.

The present invention inexpensively provides an electrode material for a fuel electrode, the electrode material having CO.sub.2 resistance and being capable of forming a fuel cell having high electricity generation performance. An electrode material for a fuel electrode, the electrode material constituting a fuel electrode of a fuel cell including a proton-conductive solid electrolyte layer, includes a perovskite-type solid electrolyte component and a nickel (Ni) catalyst component, in which the solid electrolyte component includes a barium component, a zirconium component, a cerium component, and a yttrium component, and the mixture ratio of the zirconium component to the cerium component in the solid electrolyte component is set to be 1:7 to 7:1 in terms of molar ratio.

Disclosed is a rapid, reproducible solution-based method to synthesize solid sodium ion-conductive materials. The method includes: (a) forming an aqueous mixture of (i) at least one sodium salt, and (ii) at least one metal oxide; (b) adding at least one phosphorous precursor as a neutralizing agent into the mixture; (c) concentrating the mixture to form a paste; (d) calcining or removing liquid from the paste to form a solid; and (e) sintering the solid at a high temperature to form a dense, non-porous, sodium ion-conductive material. Solid sodium ion-conductive materials have electrochemical applications, including use as solid electrolytes for batteries.

Disclosed are a highly ionic conductive zirconia electrolyte and a high-efficiency solid oxide fuel cell using the same. The highly ionic conductive zirconia electrolyte is configured such that a scandia (Sc.sub.2O.sub.3) stabilized zirconia (ZrO.sub.2) electrolyte is simultaneously doped with cerium oxide (CeO.sub.2) and at least one oxide of gadolinium oxide (Gd.sub.2O.sub.3), samarium oxide (Sm.sub.2O.sub.3), and ytterbium oxide (Yb.sub.2O.sub.3) so that an ionic conductivity drop rate is mitigated.