Forming a lithium lanthanum zirconate thin film includes disposing zirconium oxide on a substrate to yield a zirconium oxide coating, contacting the zirconium oxide coating with a solution including a lithium salt and a lanthanum salt, heating the substrate to yield a dried salt coating on the zirconium oxide coating, melting the dried salt coating to yield a molten salt mixture, reacting the molten salt mixture with the zirconium oxide coating to yield lithium lanthanum zirconate, and cooling the lithium lanthanum zirconate to yield a lithium lanthanum zirconate coating on the substrate. In some cases, the zirconium oxide coating is contacted with an aqueous molten salt mixture including a lithium salt and a lanthanum salt, the molten salt mixture is reacted with the zirconium oxide coating to yield lithium lanthanum zirconate, and the lithium lanthanum zirconate is cooled to yield a lithium lanthanum zirconate coating on the substrate.

The present invention relates to a solid oxide fuel cell especially protonic ceramic fuel cell which can operate at intermediate temperature and fuel cell thereof. The composition comprising a formula BaCe.sub.0.7Zr.sub.0.25-xY.sub.xZn.sub.0.05O.sub.3-δ or BaCe.sub.0.7Zr.sub.0.1Y.sub.0.2-xPr.sub.xO.sub.3-δ, wherein x=0.05, 0.1, 0.15, 0.2 or 0.25 to vary Zr and Y percentage at the B-site, and Ba=100%, Ce=70%; and Zn=5%.

The solid electrolyte according to an embodiment of the present disclosure is represented by the following formula (1):

Li.sub.7-2x-yLa.sub.3(Zr.sub.2-xTe.sub.xM.sub.y)O.sub.12  (1) wherein 0.30≤x≤0.80, 0.00≤y 1.50, M is at least one element selected from the group consisting of Nb, Ta, and Sb.

The solid electrolyte according to an embodiment of the present disclosure is represented by the following formula (1):

Li.sub.7−x+y(La.sub.3−yBa.sub.y) (Zr.sub.2−xM.sub.x)O.sub.12   (1) wherein 0.20≤x<1.50, 0.00<y<0.30, M is two or more elements selected from the group consisting of Nb, Ta, and Sb.

Some aspects of the present invention may include a method of fabricating an electrolyte suitable for a fuel cell or electrolyzer, comprising: determining one or more or two or more target material properties of the electrolyte or overall or overall system-level property of the fuel cell or electrolyzer; utilizing a predefined quantitative relationship between a material property and an order parameter involving one or more electrolyte components to determine at least one material ordering that has the target material property; and controlling process parameters to form at least one electrolyte material having the target material property. Some aspects of the present invention may include a method of fabricating an electrolyte suitable for a fuel cell or electrolyzer, to determine at least one or more material orderings that that provides the best overall performance for the device.

A sintered composite ceramic, including: a lithium-garnet major phase; and a grain growth inhibitor minor phase, such that the grain growth inhibitor minor phase has a metal oxide in a range of 0.1 wt. % to 10 wt. % based on the total weight of the sintered composite ceramic.

An all solid battery includes: a solid electrolyte layer; a positive electrode layer provided on a first face of the solid electrolyte layer, a part of the positive electrode layer extending to a first edge portion of the solid electrolyte layer; a first margin layer that is provided on an area of the solid electrolyte layer where the positive electrode is not provided; a negative electrolyte layer provided on a second face of the solid electrolyte layer, a part of the negative electrolyte layer extending to a second edge portion of the solid electrolyte layer; a second margin layer that is provided on an area of the second face of the solid electrolyte layer where the negative electrolyte layer is not provided; wherein a main component of the first margin layer and the second margin layer is solid electrolyte of which ionic conductivity is lower than that of the solid electrolyte layer.

A dense β″-alumina/zirconia composite solid electrolyte and process for fabrication are disclosed. The process allows fabrication at temperatures at or below 1600° C. The solid electrolytes include a dense composite matrix of β″-alumina and zirconia, and one or more transition metal oxides that aid the conversion and densification of precursor salts during sintering. The composite solid electrolytes find application in sodium energy storage devices and power-grid systems and devices for energy applications.

Disclosed is a cathode active material that can lower sintering temperature, the cathode active mated al including a particle of a lithium containing composite oxide having a layered rock-salt crystalline phase, wherein the layered rock-salt crystalline phase is partially deficient in lithium, a percentage of deficient lithium in the layered rock-salt crystalline phase in a surface portion of the particle is higher than that in the layered rock-salt crystalline phase inside the particle, and the particle includes two phases that are different in lattice constant as the layered rock-salt crystalline phase.

The present disclosure belongs to the technical field of solid oxide fuel cell stacks, and particularly relates to a method for preparing a connector-free anode-supported solid oxide fuel cell stack by means of 3D printing. The method includes taking a mixed paste of an anode ceramic powder and a photosensitive resin as a raw material, and preparing a three-dimensional channel honeycomb-type anode-supported matrix by means of 3D printing; and obtaining an anode-supported solid oxide fuel cell by means of an impregnation method, effectively bringing same into contact, and abutting and sealing same in the order of a cathode, an anode and a cathode, and forming the connector-free anode-supported solid oxide fuel cell stack after performing connection in series.