Toho Titanium Co., Ltd.

The Gakushuin School Corporation

Nakashima Sangyo Co., Ltd.

Mamoru Nakashima

Hideki Sakai

Mikio Nakashima

Daisuke Taki

Yoshiyuki Inaguma

A method for producing a potassium titanate easily produces a potassium titanate having a high single phase ratio and a significantly reduced fibrous potassium titanate content in high yield. The method for producing a potassium titanate includes: a mixing step that mixes a titanium raw material with a potassium raw material, the titanium raw material including 0 to 60 mass % of titanium oxide having a specific surface area of 1 to 2 m/g, 40 to 100 mass % of titanium oxide having a specific surface area of 7 to 200 m/g, and 0 to 4.5 mass % in total of one or more materials selected from titanium metal and titanium hydride, and the potassium raw material including a potassium compound; a calcination step that calcines a raw material mixture obtained by the mixing step at a calcination temperature of 950 to 990&#xb0; C.; and a grinding step that grinds a calcined powder obtained by the calcination step using one or more means selected from a vibrating mill and an impact pulverizer.

Process for producing potassium titanate

Provided is an alkali-metal titanate in which the content and adhesivity of the fibrous potassium titanate is significantly reduced. The alkali-metal titanate includes 0.5 mol to 2.2 mol of potassium oxide in terms of potassium atoms, 0.05 mol to 1.4 mol of sodium oxide in terms of sodium atoms, and 0 mol to 1.4 mol of lithium oxide in terms of lithium atoms relative to 1 mol of alkali-metal hexatitanate, in which a total content of potassium oxide in terms of potassium atoms, sodium oxide in terms of sodium atoms, and lithium oxide in terms of lithium atoms relative to 1 mol of alkali-metal hexatitanate is 1.8 mol to 2.3 mol; and the alkali-metal titanate has a single phase conversion ratio of 85% to 100%, a fiber ratio of 0% by volume to 10% by volume, and a moisture content of 0% by mass to 1.0% by mass.

Alkali-metal titanate and friction material

A lithium-lanthanum-titanium oxide sintered material has a lithium ion conductivity 3.0&#xd7;10Scmor more at a measuring temperature of 27&#xb0; C., the material is described by one of general formulas (1&#x2212;a)LaLiTiO-aSrTiO, (1&#x2212;a)LaLiTiO-aLaKTiO, LaLiTiMO, SrLaLiTiTaO(0.55&#x2266;x&#x2266;0.59, 0&#x2266;a&#x2266;0.2, M=at least one of Fe or Ga), amount of Al contained is 0.35 mass % or less as AlO, amount of Si contained is 0.1 mass % or less as SiO, and average particle diameter is 18 &#x3bc;m or more.

Lithium-lanthanum-titanium oxide sintered material, solid electrolyte containing the oxide, and lithium air battery and all-solid lithium battery including the solid electrolyte

A lithium-lanthanum-titanium oxide sintered material has a lithium ion conductivity 3.0&#xd7;10Scmor more at a measuring temperature of 27&#xb0; C., the material is described by one of general formulas (1-a)LaLiTiO-aSrTiO, (1-a)LaLiTiO-aLaKTiO, LaLiTiMO, and SrLaLiTiTaO(0.55&#x2266;x&#x2266;0.59, 0&#x2266;a&#x2266;0.2, M=at least one of Al, Fe and Ga), and concentration of S is 1500 ppm or less. The material is obtained by sintering raw material powder mixture having S content amount of 2000 ppm or less in the entirety of raw material powders for mixture, that is, titanium raw material, lithium raw material, and lanthanum raw material.

Lithium-lanthanum-titanium oxide sintered material, solid electrolyte containing the oxide, lithium air battery and all-solid lithium battery including the solid electrolyte, and method for producing the lithium-lanthanum-titanium oxide sintered material

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Yokohama, Japan

Mamoru Nakashima