Patents by Inventor Kazuhiko Kikuya
Kazuhiko Kikuya has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20210384503Abstract: The present invention relates to a lithium transition metal composite oxide capable of being used as a positive electrode (cathode) active material for non-aqueous electrolyte lithium secondary batteries having a general formula Li1+a(1?x?y?z)M1xM2yM3(1?a)(1?x?y?z)M3?a(1?x?y?z)M4zO2+a(1?x?y?z), in which 0.7?x<1, y=(1?x)/2, 0?z?0.05 and 0<a(1?x?y?z)?0.05, and where M1 is Ni having an oxidation state of three, M2 is one or more metal cations having an oxidation state of three, M3? and M3 are identically one or more metal cations with at least one ion being Mn, wherein the one or more metal cations M3 have an oxidation state of four and the one or more metal cations M3 have an oxidation state of three, and M4 is one or more metal cations selected from of Mg, Al and B. Further, the present invention relates and a method for preparing the lithium transition metal composite oxide and to a non-aqueous electrolyte lithium secondary battery containing the lithium transition metal composite oxide.Type: ApplicationFiled: October 10, 2019Publication date: December 9, 2021Inventors: Yasuo ANNO, Kazuhiko KIKUYA, Takehiko SUWA, Tetsuya MAKINO, Koki INOUE, Takuma SAKAMOTO, Young Chul CHANG, Seung Joon LEE, Su Jin YOON, Ju Yong KIM, Hwamyung JANG
-
Patent number: 9764962Abstract: The present invention provides lithium composite compound particles having good high-temperature storage property and excellent cycle characteristics as an active substance for a non-aqueous electrolyte secondary battery, and a secondary battery using the lithium composite compound particles. The Li—Ni composite oxide particles for a non-aqueous electrolyte secondary battery according to the present invention have a BET specific surface area of 0.05 to 0.8 m2/g; an atomic ratio (Ma/Ni) of a concentration of an amphoteric metal to a concentration of Ni on an outermost surface of the respective Li—Ni composite oxide particles is 2 to 6; and the concentration of the amphoteric metal on the outermost surface of the respective Li—Ni composite oxide particles is higher than a concentration of the amphoteric metal at a position spaced by 50 nm from the outermost surface toward a center of the respective Li—Ni composite oxide particles.Type: GrantFiled: April 12, 2012Date of Patent: September 19, 2017Assignee: TODA KOGYO CORPORATIONInventors: Taiki Imahashi, Hiroyasu Watanabe, Kazuhiko Kikuya, Hideaki Sadamura
-
Patent number: 9698420Abstract: The present invention relates to Li-Ni composite oxide particles that exhibit a high initial discharge capacity and are excellent in thermal stability when used as a positive electrode active substance for non-aqueous electrolyte secondary batteries, and a process for producing the Li-Nicomposite oxide particles. The Li-Ni composite oxide particles of the present invention have a composition of LixNi1?y?a?bCoyM1aM2bO2 wherein x, y, a and b represent 1.00?x?1.10; 0<y?0.25; 0<a?0.25; and 0?b?0.10, respectively; M1 is at least one element selected from the group consisting of Al and Mn; and M2 is at least one element selected from the group consisting of Zr and Mg, in which a product of a metal occupancy (%) of lithium sites of the Li-Ni composite oxide as determined by Rietveld analysis of X-ray diffraction thereof and a crystallite size (nm) of the Li-Ni composite oxide as determined by the Rietveld analysis is not less than 700 and not more than 1400.Type: GrantFiled: October 15, 2013Date of Patent: July 4, 2017Assignee: TODA KOGYO CORP.Inventors: Kazutoshi Ishizaki, Kazuhiko Kikuya, Takahiko Sugihara, Teruaki Santoki, Takamitsu Harada, Masaki Nishimura, Yuji Mishima, Hideaki Sadamura
-
Patent number: 9455444Abstract: The present invention relates to lithium composite compound particles having a composition represented by the formula: Li1+xNi1?y?zCoyMzO2 (M=B or Al), wherein the lithium composite compound particles have an ionic strength ratio A (LiO?/NiO2?) of not more than 0.3 and an ionic strength ratio B (Li3CO3+/Ni+) of not more than 20 as measured on a surface of the respective lithium composite compound particles using a time-of-flight secondary ion mass spectrometer. The lithium composite compound particles of the present invention can be used as a positive electrode active substance of a secondary battery which has good cycle characteristics and an excellent high-temperature storage property.Type: GrantFiled: December 3, 2009Date of Patent: September 27, 2016Assignee: TODA KOGYO CORPORATIONInventors: Hiroyasu Watanabe, Taiki Imahashi, Kazuhiko Kikuya, Nobuyuki Tagami, Hideaki Sadamura
-
Patent number: 9249034Abstract: Positive electrode active substance particles including a compound having at least a crystal system belonging to a space group of R?3m and a crystal system belonging to a space group of C2/m, and boron. The compound is a composite oxide comprising at least Li, Mn, and Co and/or Ni; a relative intensity ratio [(a)/(b)] of a maximum diffraction peak intensity (a) observed at 2?=20.8±1° in a powder X-ray diffraction pattern of the positive electrode active substance as measured using a Cu-Ku ray to a maximum diffraction peak intensity (b) observed at 2?=18.6±1° in the powder X-ray diffraction pattern, is 0.02 to 0.5; a content of Mn in the positive electrode active substance particles such that a molar ratio of Mn/(Ni+Co+Mn) is not less than 0.55; and the positive electrode active substance particles include boron in an amount of 0.001 to 3% by weight.Type: GrantFiled: September 28, 2010Date of Patent: February 2, 2016Assignee: TODA KOGYO CORPORATIONInventors: Manabu Yamamoto, Daisuke Nishikawa, Kazutoshi Ishizaki, Kazuhiko Kikuya, Teruaki Santoki, Osamu Sasaki, Hideaki Sadamura
-
Publication number: 20150280211Abstract: The present invention relates to Li—Ni composite oxide particles having a composition of Lix(NiyCo2(1-y)/5Mn3(1-y)/5)1-zMzO2 wherein x, y and z represent 1.00?x?1.10; 0.65<y<0.82; and 0?z<0.05, respectively; and M is at least one element selected from the group consisting of Al, Zr and Mg. The Li—Ni composite oxide particles of the present invention exhibit a high initial discharge capacity and are excellent in first-cycle charge/discharge efficiency when used as a positive electrode active substance for non-aqueous electrolyte secondary batteries.Type: ApplicationFiled: October 15, 2013Publication date: October 1, 2015Inventors: Kazuhiko Kikuya, Kazutoshi Ishizaki, Masaki Nishimura, Yuji Mishima, Hideaki Sadamura
-
Publication number: 20150249248Abstract: The present invention relates to Li—Ni composite oxide particles that exhibit a high initial discharge capacity and are excellent in thermal stability when used as a positive electrode active substance for non-aqueous electrolyte secondary batteries, and a process for producing the Li—Ni composite oxide particles. The Li—Ni composite oxide particles of the present invention have a composition of LixNi1-y-a-bCoyM1aM2bO2 wherein x, y, a and b represent 1.00?x?1.10; 0<y?0.25; 0<a?0.25; and 0?b?0.10, respectively; M1 is at least one element selected from the group consisting of Al and Mn; and M2 is at least one element selected from the group consisting of Zr and Mg, in which a product of a metal occupancy (%) of lithium sites of the Li—Ni composite oxide as determined by Rietveld analysis of X-ray diffraction thereof and a crystallite size (nm) of the Li—Ni composite oxide as determined by the Rietveld analysis is not less than 700 and not more than 1400.Type: ApplicationFiled: October 15, 2013Publication date: September 3, 2015Inventors: Kazutoshi Ishizaki, Kazuhiko Kikuya, Takahiko Sugihara, Teruaki Santoki, Takamitsu Harada, Masaki Nishimura, Yuji Mishima, Hideaki Sadamura
-
Publication number: 20140087262Abstract: The present invention provides lithium composite compound particles having good high-temperature storage property and excellent cycle characteristics as an active substance for a non-aqueous electrolyte secondary battery, and a secondary battery using the lithium composite compound particles. The Li—Ni composite oxide particles for a non-aqueous electrolyte secondary battery according to the present invention have a BET specific surface area of 0.05 to 0.8 m2/g; an atomic ratio (Ma/Ni) of a concentration of an amphoteric metal to a concentration of Ni on an outermost surface of the respective Li—Ni composite oxide particles is 2 to 6; and the concentration of the amphoteric metal on the outermost surface of the respective Li—Ni composite oxide particles is higher than a concentration of the amphoteric metal at a position spaced by 50 nm from the outermost surface toward a center of the respective Li—Ni composite oxide particles.Type: ApplicationFiled: April 12, 2012Publication date: March 27, 2014Applicant: TODA KOGYO CORPORATIONInventors: Taiki Imahashi, Hiroyasu Watanabe, Kazuhiko Kikuya, Hideaki Sadamura
-
Publication number: 20130330626Abstract: The present invention relates to Li—Ni-based composite oxide particles comprising Mn, and Co and/or Al, wherein Co and Al are uniformly dispersed within the particles, and Mn is present with a gradient of its concentration in a radial direction of the respective particles such that a concentration of Mn on a surface of the respective particles is higher than that at a central portion thereof. The Li—Ni-based composite oxide particles can be produced by allowing an oxide and a hydroxide comprising Mn to mechanically adhere to Li—Ni-based oxide comprising Co and/or Al; and then heat-treating the obtained material at a temperature of not lower than 400° C. and not higher than 1,000° C. The Li—Ni-based composite oxide particles of the present invention are improved in thermal stability and alkalinity.Type: ApplicationFiled: August 15, 2013Publication date: December 12, 2013Applicant: TODA KOGYO CORPORATIONInventors: Akihisa KAJIYAMA, Kazuhiko KIKUYA, Teruaki SANTOKI, Osamu SASAKI, Satoshi NAKAMURA, Taiki IMAHASHI, Hideaki SADAMURA
-
Patent number: 8574765Abstract: Li—Ni composite oxide particles for a non-aqueous electrolyte secondary battery with a large charge/discharge capacity and excellent thermal stability in a charged condition. The Li—Ni composite oxide secondary particles form core particles having a composition Lix1Ni1-y1-z1-w1Coy1Mnz1Mw1O2 in which 0.9?x1?1.3; 0.1?y1?0.3; 0.0?z1?0.3; 0?w1?0.1; and M is Al or Fe. The Li—Ni composite oxide has a composition Lix2Ni1-y2-z2-w2Coy2Mnz2Mw2O2 in which 0.9?x2?1+z2; 0?y2?0.33; 0?z2?0.5; 0?w2?0.1; and M is Al, Fe, Mg, Zr or Ti and is coated or present on a surface of the secondary particles.Type: GrantFiled: March 5, 2008Date of Patent: November 5, 2013Assignee: Toda Kogyo CorporationInventors: Kazuhiko Kikuya, Osamu Sasaki, Teruaki Santoki, Hiroshi Yamamoto
-
Patent number: 8546018Abstract: The present invention relates to Li—Ni-based composite oxide particles comprising Mn, and Co and/or Al, wherein Co and Al are uniformly dispersed within the particles, and Mn is present with a gradient of its concentration in a radial direction of the respective particles such that a concentration of Mn on a surface of the respective particles is higher than that at a central portion thereof. The Li—Ni-based composite oxide particles can be produced by allowing an oxide and a hydroxide comprising Mn to mechanically adhere to Li—Ni-based oxide comprising Co and/or Al; and then heat-treating the obtained material at a temperature of not lower than 400° C. and not higher than 1,000° C. The Li—Ni-based composite oxide particles of the present invention are improved in thermal stability and alkalinity.Type: GrantFiled: November 11, 2008Date of Patent: October 1, 2013Assignee: Toda Kogyo CorporationInventors: Akihisa Kajiyama, Kazuhiko Kikuya, Teruaki Santoki, Osamu Sasaki, Satoshi Nakamura, Taiki Imahashi, Hideaki Sadamura
-
Publication number: 20120217435Abstract: The present invention relates to positive electrode active substance particles comprising a compound having at least a crystal system belonging to a space group of R?3m and a crystal system belonging to a space group of C2/m, and boron, wherein the compound is a composite oxide comprising at least Li, Mn, and Co and/or Ni; a relative intensity ratio [(a)/(b)] of a maximum diffraction peak intensity (a) observed at 2?=20.8±1° in a powder X-ray diffraction pattern of the positive electrode active substance as measured using a Cu-Ka ray to a maximum diffraction peak intensity (b) observed at 2?=18.6±1° in the powder X-ray diffraction pattern, is 0.02 to 0.5; a content of Mn in the positive electrode active substance particles is controlled such that a molar ratio of Mn/(Ni+Co+Mn) therein is not less than 0.55; and the positive electrode active substance particles comprise the boron in an amount of 0.001 to 3% by weight.Type: ApplicationFiled: September 28, 2010Publication date: August 30, 2012Inventors: Manabu Yamamoto, Daisuke Nishikawa, Kazutoshi Ishizaki, Kazuhiko Kikuya, Teruaki Santoki, Osamu Sasaki, Hideaki Sadamura
-
Patent number: 8066913Abstract: The present invention relates to Li—Ni composite oxide particles for a non-aqueous electrolyte secondary cell which have a large charge/discharge capacity, an excellent packing density and excellent storage performance. The Li—Ni composite oxide particles for a non-aqueous electrolyte secondary cell which have a composition represented by the formula: LixNi1-y-zCoyAlz02 in which 0.9<x<1.3; 0.1<y<0.3; and 0<z<0.3, wherein the composite oxide particles have a rate of change in specific surface area of not more than 10% as measured between before and after applying a pressure of 1 t/cm2 thereto, and a sulfate ion content of not more than 1.0%, can be produced by mixing Ni—Co hydroxide particles having a sulfate ion content of not more than 1.0% whose surface is coated with an Al compound having a primary particle diameter of not more than 1 ?m, with a lithium compound; and calcining the resulting mixture.Type: GrantFiled: June 5, 2009Date of Patent: November 29, 2011Assignee: Toda Kogyo CorporationInventors: Kazuhiko Kikuya, Osamu Sasaki, Teruaki Santoki, Hiroshi Yamamoto
-
Publication number: 20110281168Abstract: The present invention relates to lithium composite compound particles having a composition represented by the formula: Li1+xNi1-y-zCoyMzO2 (M=B or Al), wherein the lithium composite compound particles have an ionic strength ratio A (LiO?/NiO2?) of not more than 0.3 and an ionic strength ratio B (Li3CO3+/Ni+) of not more than 20 as measured on a surface of the respective lithium composite compound particles using a time-of-flight secondary ion mass spectrometer. The lithium composite compound particles of the present invention can be used as a positive electrode active substance of a secondary battery which has good cycle characteristics and an excellent high-temperature storage property.Type: ApplicationFiled: December 3, 2009Publication date: November 17, 2011Applicant: TODA KOGYO CORPORATIONInventors: Hiroyasu Watanabe, Taiki Imahashi, Kazuhiko Kikuya, Nobuyuki Tagami, Hideaki Sadamura
-
Publication number: 20100316910Abstract: The present invention relates to Li—Ni-based composite oxide particles comprising Mn, and Co and/or Al, wherein Co and Al are uniformly dispersed within the particles, and Mn is present with a gradient of its concentration in a radial direction of the respective particles such that a concentration of Mn on a surface of the respective particles is higher than that at a central portion thereof. The Li—Ni-based composite oxide particles can be produced by allowing an oxide and a hydroxide comprising Mn to mechanically adhere to Li—Ni-based oxide comprising Co and/or Al; and then heat-treating the obtained material at a temperature of not lower than 400° C. and not higher than 1,000° C. The Li—Ni-based composite oxide particles of the present invention are improved in thermal stability and alkalinity.Type: ApplicationFiled: November 11, 2008Publication date: December 16, 2010Inventors: Akihisa Kajiyama, Kazuhiko Kikuya, Teruaki Santoki, Osamu Sasaki, Satoshi Nakamura, Taiki Imahashi, Hideaki Sadamura
-
Publication number: 20100099027Abstract: The present invention relates to Li—Ni composite oxide particles for a non-aqueous electrolyte secondary battery which have a large charge/discharge capacity and are excellent in thermal stability under a charged condition. The above object can be achieved by the Li—Ni composite oxide particles for a non-aqueous electrolyte secondary battery, comprising a Li—Ni composite oxide whose secondary particles form core particles thereof and have a composition represented by the formula: Lix1Ni1-y1-z1-w1Coy1Mnz1Mw1O2 (in which 0.9?x1?1.3; 0.1?y1?0.3; 0.0?z1?0.3; 0?w1?0.1; and M is at least one metal selected from the group consisting of Al and Fe), wherein a Li—Ni composite oxide having a composition represented by the formula: Lix2Ni1-y2-z2-w2Coy2Mnz2Mw2O2 (in which 0.9?x2?1+z2; 0?y2?0.33; 0?z2?0.5; 0?w2?0.1; and M is at least one metal selected from the group consisting of Al, Fe, Mg, Zr and Ti, is coated or present on a surface of the respective secondary particles.Type: ApplicationFiled: March 5, 2008Publication date: April 22, 2010Inventors: Kazuhiko Kikuya, Osamu Sasaki, Teruaki Santoki, Hiroshi Yamamoto
-
Publication number: 20090272940Abstract: The present invention relates to Li—Ni composite oxide particles for a non-aqueous electrolyte secondary cell which have a large charge/discharge capacity, an excellent packing density and excellent storage performance. The Li—Ni composite oxide particles for a non-aqueous electrolyte secondary cell which have a composition represented by the formula: LixNi1-y-zCoyAlz02 in which 0.9<x<1.3; 0.1<y<0.3; and 0<z<0.3, wherein the composite oxide particles have a rate of change in specific surface area of not more than 10% as measured between before and after applying a pressure of 1 t/cm2 thereto, and a sulfate ion content of not more than 1.0%, can be produced by mixing Ni—Co hydroxide particles having a sulfate ion content of not more than 1.0% whose surface is coated with an Al compound having a primary particle diameter of not more than 1 ?m, with a lithium compound; and calcining the resulting mixture.Type: ApplicationFiled: June 5, 2009Publication date: November 5, 2009Applicant: TODA KOGYO CORPORATIONInventors: Kazuhiko Kikuya, Osamu Sasaki, Teruaki Santoki, Hiroshi Yamamotoa
-
Patent number: 6325988Abstract: A process for preparing a spinel lithium manganese complex oxide having the general formula LixMn2−yAlyO4 (wherein 0.9≦x≦1.1, and 0.002≦y≦0.5) the process comprising the steps of reacting a manganese complex hydroxide represented by the general formula (IIa) Mn2+(1−a)Al3+a(OH)[2+a−nz](An−)2·mH2O (wherein An− is an anion having a valence n, 0.001≦a≦0.25, 0.03<z<0.3 and 0<m) with a water-soluble lithium compound in a molar ratio of Li/(Mn+Al) of 0.45˜0.55 in an aqueous medium to obtain a slurry, spray- or freeze-drying the obtained slurry, and heating the resultant dry material at a temperature of 600˜900° C.Type: GrantFiled: October 25, 1999Date of Patent: December 4, 2001Assignee: Fuji Chemical Industry Co., Ltd.Inventors: Hidetoshi Inoue, Kazuhiko Kikuya, Hitoshi Machimura, Yukio Matsubara