Forschungszentrum Juelich Gmbh

Olivier Guillon

Frank Tietz

Qianli Ma

Robert Vassen

Jesus Gonzalez

Apurv Dash

Martin Bram

Sven Uhlenbruck

Sahir Naqash

Juergen Dornseiffer

Hans-Gregor Gehrke

Tu Lan

Manuel Krott

Marc Rubat Du Merac

The invention relates to a method for producing a non-oxide ceramic powder comprising a nitride, a carbide, a boride or at least one MAX phase with the general composition Mn+1AXn, where M=at least one element from the group of transition elements (Sc, Ti, V, Cr, Zr, Nb, Mo, Hf and Ta), A=at least one A group element from the group (Si, Al, Ga, Ge, As, Cd, In, Sn, Tl and Pb), X=carbon (C) and/or nitrogen (N) and/or boron (B), and n=1, 2 or 3. According to the invention, corresponding quantities of elementary starting materials or other precursors are mixed with at least one metal halide salt (NZ), compressed (pellet), and heated for synthesis with a metal halide salt (NZ). The compressed pellet is first enveloped with another metal halide salt, compressed again, arranged in a salt bath and heated therewith until the melting temperature of the salt is exceeded. Optionally, melted silicate can be added, which prevents the salt from evaporating at high temperatures. Advantageously, the method can be carried out in the presence of air.

Method for producing non-oxide ceramic powders

Provided is a method for producing an electrode for a solid-state battery comprising providing a multilayer solid ceramic electrolyte that comprises at least one dense layer having a total ion conductivity of at least 1 mS/cm at 25&#xb0; C. and at least one porous layer having continuous and open pores having an average pore diameter between 1 and 50 &#x3bc;m; providing an aqueous infiltration fluid comprising at least one organic additive that can be at least partially converted into carbon; introducing the aqueous infiltration fluid into the at least one porous layer of the multilayer solid ceramic electrolyte; and subjecting the multilayer solid ceramic electrolyte to a thermal treatment in the form of sintering in a reducing atmosphere at temperatures between 400&#xb0; C. and 900&#xb0; C., whereby the electrode material is synthesized from the precursor of the electrode material on the surface of the pores in situ.

Solid state battery and method for producing same

A method for sintering metallic and/or non-oxide components includes completely encapsulating, in a metal halide salt, a green body comprising at least one metallic and/or non-oxide powder, and compressing the encapsulated green body so as to be gastight. The method further includes heating, together with a metal halide salt in the presence of oxygen up to sintering temperatures, the compressed, encapsulated green body. The method additionally includes at least partially dissolving, after cooling, the metal halide salt in a liquid so that the sintered component can be removed.

Method for sintering metals, non-oxide ceramics and other oxidation-sensitive materials

A method for producing a transparent polycrystalline ceramic includes forming at least one planar transparent region near a surface within the ceramic, wherein the at least one planar transparent region has a lower thermal expansion coefficient than other regions of the ceramic. The method further includes generating compressive stresses in the at least one planar transparent region near the surface after a thermal treatment and cooling.

Method for reinforcing transparent ceramics, and ceramic

A method for preparing electrolyte material having a NASICON structure, based on a NaScZr(SiO)(PO) compound where 0&#x2264;x&#x3c;2. The method includes providing an acidic, aqueous solution which, according to a desired stoichiometry, comprises sodium, scandium and zirconium in the form of water-soluble nitrates, acetates or carbonates, and soluble silicates or orthosilicic acids or organic silicon compounds in dissolved form; subsequently adding phosphoric acid or ammonium dihydrogenphosphate or other soluble phosphates, according to the desired stoichiometry, complex zirconium dioxide phosphates forming as colloidal precipitations; and subsequently drying and calcining the mixture.

Electrolyte material having a NASICON structure for solid-state sodium ion batteries and method for the production thereof

A method for producing a ceramic cathode layer on an electrically conductive substrate includes applying a coating to the electrically conductive substrate, the coating being in a form of a suspension including at least one suspending agent and at least one ceramic material. The method further includes heating the coating in a reducing atmosphere such that the ceramic material is completely or in part reduced to a fusible reaction product, heating the coating in a reducing atmosphere to temperatures above the melting point of the reaction product so as to form a melt, densifying or sintering the coating in a reducing atmosphere at temperatures that are 100&#xb0; C. greater than a melting temperature of the reaction product, and reoxidizing the densified or sintered coating in an oxidizing atmosphere in a temperature range of between 400&#xb0; C. and 1,200&#xb0; C.

Method for producing ceramic cathode layers on current collectors

A method for preparing a lithium titanium phosphate, wherein a sol-gel process is used to prepare the phosphate, includes producing a sol from source materials; converting the sol to a gel; and drying the gel to obtain a corresponding powder comprising the lithium titanium phosphate. In a substep, the method further includes adding titanium(IV) isopropoxide to water to produce precipitates of titanium hydroxide oxide, cooling a system down to a temperature of less than 10&#xb0; C., and redissolving the precipitates by adding nitric acid to form an aqueous TiOnitrate solution. The lithium titanium phosphate has a general composition LiMTi(PO)(SiO), wherein M=Al, Ga, In, Sc, V, Cr, Mn, Co, Fe, Y, La&#x2014;Lu, wherein 0&#x2264;x&#x2264;0.5, and wherein 0&#x2264;y&#x2264;0.5.

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Juelich, Germany

Olivier Guillon