Ceramatec, Inc.

Roger Marc Flinders

Raymond Ashton Cutler

Shekar H Balagopal

Spencer Jackman

Darin Ray

Lithium-ion-conducting ceramic materials are disclosed having characteristics of high lithium-ion conductivity at low temperatures, good current efficiency, and stability in water and corrosive media under static and electrochemical conditions. Some general formulas for the lithium-ion-conducting materials include MMMMMPOand MMMMPO, wherein Mcomprises Li, Na, or mixtures thereof; 0.05&#x3c;x&#x3c;0.5, 0.05&#x3c;y&#x3c;2, 0&#x2266;z&#x3c;3, and 0&#x2266;&#x3b4;&#x3c;0.5; Mcomprises Al, Hf, Sc, Y, La, or mixtures thereof; Mcomprises Zr, Ge, Sn, or mixtures thereof; Mcomprises Ti; and Mcomprises Si, Ge, Sn, or mixtures thereof. In some cases, the lithium-ion conducting materials are formed through a process in which the materials' powdered precursors are milled after being calcined and before being sintered. The milling process may include using milling media of multiple sizes.

Lithium-ion-conducting materials

Pressureless sintering of silicon carbide with fracture toughness in excess of about 4 MPa-mas measured by the single-edge precracked beam (SEPB) technique while maintaining a density greater than 3.1 g/cc for compositions with SiC greater than about 94 wt. % is made possible through the use of metallic Al to promote sintering and grain growth. Boron and carbon may be used as traditional sintering aids, with nitrogen to suppress grain growth, and additions of yttrium and/or lanthanide elements to promote intergranular fracture.

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West Valley, UT, United States of America

Roger Marc Flinders