US 11,685,694 B2 · Facile synthesis of solid sodium ion-conductive electrolytes

Abstract

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.

Claims26

Dependent claims

A method comprising:

(a) forming an alkaline mixture by mixing together in a liquid,
(i) at least one sodium salt comprising a sodium cation and a basic anion, and
(ii) at least one metal oxide;
(b) neutralizing the alkaline mixture with a solution comprising at least one phosphorous precursor;
(c) concentrating the neutralized mixture by heating at 180° C. for 1-2 hours to form a paste;
(d) calcinating the paste at 700° C. for 3 hours to remove liquid from the paste and to form a solid;
and
(e) sintering the solid at a temperature in the range of 900° C. to 1250° C. for 2-4 hours, wherein the sintered solid is an ion-conductive ceramic comprising sodium, at least one metal, oxygen, and phosphorous.

5 more elements

A method comprising:

(a) forming an aqueous mixture by mixing together in a liquid,
(i) at least one sodium salt comprising a sodium cation and a basic anion,
(ii) at least one metal oxide, and
(iii) at least one phosphorous precursor as a neutralizing agent;
(b) concentrating the aqueous mixture by heating at 180° C. for 1-2 hours to form a paste;
(c) calcinating the paste at 700° C. for 3 hours to remove any liquid from the paste and to form a solid;
and
(d) sintering the solid at a temperature in the range of 900° C. to 1250° C. for 2-4 hours, wherein the sintered solid is an ion-conductive ceramic comprising sodium, at least one metal, oxygen, and phosphorous.

5 more elements

Dependencies are inferred from the claim text.

Facile synthesis of solid sodium ion-conductive electrolytes

Life of this patent

Facile synthesis of solid sodium ion-conductive electrolytes

Life of this patent

Abstract

Claims26