Toda Kogyo Corporation

Hideaki Sadamura

Hiroyasu Watanabe

Akihisa Kajiyama

Kazutoshi Ishizaki

Shoichi Fujino

Norimiki Sugiyama

Masayuki Uegami

Kazumichi Koga

Kazuhiko Kikuya

Manabu Yamamoto

Mitsuaki Hatatani

Osamu Sasaki

Hideaki Maeda

Kazutoshi Matsumoto

Teruaki Santoki

Hiroaki Masukuni

Junichi Kawano

Katsumi Yamashita

Taiki Imahashi

Daisuke Nishikawa

Yoshiro Okuda

Minoru Yamasaki

Ryuta Masaki

Daisuke Morita

Hiroshi Takahama

Tosiharu Harada

Tatsuya Nakamura

Haruki Kurokawa

Mamoru Tanihara

Tomohisa Moriya

Atsushi Takedoi

Yuji Mishima

Takahiko Sugihara

Toshitada Shigemura

Satoshi Nakamura

Nobuyuki Tagami

Takamitsu Harada

Kazuhisa Inaba

Osamu Okimoto

Masaki Nishimura

Yoshifumi Fukuhara

Kouta Sano

Taisei Inoue

Kouta Sato

The present invention provides a precursor of positive electrode active substance particles for non-aqueous electrolyte secondary batteries which have a high discharge voltage and a high discharge capacity, hardly suffer from side reactions with an electrolyte solution, and are excellent in cycle characteristics, positive electrode active substance particles for non-aqueous electrolyte secondary batteries, and processes for producing these particles, and a non-aqueous electrolyte secondary battery. The present invention relates to positive electrode active substance particles for non-aqueous electrolyte secondary batteries having a spinel structure with a composition represented by the following chemical formula (1), in which the positive electrode active substance particles satisfy the following characteristic (A) and/or characteristic (B) when indexed with Fd-3m in X-ray diffraction thereof: (A) when indexed with Fd-3m in X-ray diffraction of the positive electrode active substance particles, a ratio of I(311) to I(111) [I(311)/I(111)] is in the range of 35 to 43%, and/or (B) when indexed with Fd-3m in X-ray diffraction of the positive electrode active substance particles, a gradient of a straight line determined by a least square method in a graph prepared by plotting sin &#x3b8; in an abscissa thereof and B cos &#x3b8; in an ordinate thereof wherein B is a full-width at half maximum with respect to each peak position 2&#x3b8; (10 to 90&#xb0;) is in the range of 3.0&#xd7;10to 20.0&#xd7;10; andLiMnNiMO&#x2003;&#x2003;Chemical Formula (1)wherein x, y, z fall within the range of &#x2212;0.05&#xb7;x&#xb7;0.15, 0.4&#xb7;y&#xb7;0.6 and 0&#xb7;z&#xb7;0.20, respectively; and M is at least one element selected from the group consisting of Mg, Al, Si, Ca, Ti, Co, Zn, Sb, Ba, W and Bi.

Manganese/nickel composite oxide particles and process for producing the manganese nickel composite oxide particles, positive electrode active substance particles for non-aqueous electrolyte secondary batteries and process for producing the positive electrode active substance particles, and non-aqueous electrolyte secondary battery

The present invention provides a precursor of positive electrode active substance particles for non-aqueous electrolyte secondary batteries which have a high discharge voltage and a high discharge capacity, hardly suffer from side reactions with an electrolyte solution, and are excellent in cycle characteristics, positive electrode active substance particles for non-aqueous electrolyte secondary batteries, and processes for producing these particles, and a non-aqueous electrolyte secondary battery. The present invention relates to positive electrode active substance particles for non-aqueous electrolyte secondary batteries having a spinel structure with a composition represented by the following chemical formula (1), in which the positive electrode active substance particles satisfy the following characteristic (A) and/or characteristic (B) when indexed with Fd&#x2212;3m in X-ray diffraction thereof: (A) when indexed with Fd&#x2212;3m in X-ray diffraction of the positive electrode active substance particles, a ratio of I(311) to I(111) [I(311)/I(111)] is in the range of 35 to 43%, and/or (B) when indexed with Fd&#x2212;3m in X-ray diffraction of the positive electrode active substance particles, a gradient of a straight line determined by a least square method in a graph prepared by plotting sin &#x3b8; in an abscissa thereof and B cos &#x3b8; in an ordinate thereof wherein B is a full-width at half maximum with respect to each peak position 2&#x3b8; (10 to 90&#xb0;) is in the range of 3.0&#xd7;10to 20.0&#xd7;10; andLiMnNiMO&#x2003;&#x2003;Chemical Formula (1)wherein x, y, z fall within the range of &#x2212;0.05&#x2264;x&#x2264;0.15, 0.4&#x2264;y&#x2264;0.6 and 0&#x2264;z&#x2264;0.20, respectively; and M is at least one element selected from the group consisting of Mg, Al, Si, Ca, Ti, Co, Zn, Sb, Ba, W and Bi.

This invention provides lithium manganate which has a high output and is excellent in high-temperature stability. This invention relates to lithium manganate particles which are produced by mixing a lithium compound, a manganese compound, a Y compound and an A compound and then calcining the resulting mixture, and have a composition represented by the following chemical formula 1 and an average secondary particle diameter (D) of 1 to 15 &#x3bc;m, in which Y is at least one element selected from the group consisting of Al and Mg; A is a sintering aid element having a melting point of not higher than 850&#xb0; C.; x and y satisfy 0.03&#x2264;x&#x2264;0.15 and 0&#x2264;y&#x2264;0.20, respectively; z is in the range of 0 to 2.5 mol % based on Mn, wherein the lithium manganate particles have a sulfur content of not more than 100 ppm.LiMnYOA&#x2003;&#x2003;(Chemical Formula 1)

Lithium manganate particles for non-aqueous electrolyte secondary battery, process for producing the same, and nonaqueous electrolyte secondary battery

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&#x2014;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 m/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&#x2014;Ni composite oxide particles is 2 to 6; and the concentration of the amphoteric metal on the outermost surface of the respective Li&#x2014;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&#x2014;Ni composite oxide particles.

Li&#x2014;Ni composite oxide particles and process for producing the same, and non-aqueous electrolyte secondary battery

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 LiNiCoM1M2Owherein x, y, a and b represent 1.00&#x2266;x&#x2266;1.10; 0&#x3c;y&#x2266;0.25; 0&#x3c;a&#x2266;0.25; and 0&#x2266;b&#x2266;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.

Li-Ni composite oxide particles and process for producing the same, and non-aqueous electrolyte secondary battery

The present invention provides positive electrode active substance particles which are improved in charge/discharge capacities, cycle characteristics and thermal stability. The positive electrode active substance particles according to the present invention comprise 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 having a specific peak intensity ratio, in which a content of Mn in the compound is controlled such that a molar ratio of Mn/(Ni+Co+Mn) therein is not less than 0.55; a content of boron in the compound is 0.01 to 1% by weight; a content of fluorine in the compound is 0.01 to 5% by weight; and a content of an element A (at least one element selected from the group consisting of Al, Mg, Ti, Zr, Ca, Fe, Zn, Mo and Bi) in the compound is 0.004 to 9% by weight, and can be produced by calcining a mixture comprising precursor particles comprising Mn and Ni and/or Co, a lithium compound, a boron compound, a fluorine compound and a compound of the element A.

Positive electrode active substance particles and process for producing the same, and non-aqueous electrolyte secondary battery

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, the positive electrode active substance particles having a specific intensity ratio; a content of Mn in the positive electrode active substance particles being 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 comprising an element A (that is at least one element selected from the group consisting of Si, Zr and Y) in an amount of 0.03 to 5% by weight and having a tap density of 0.8 to 2.4 g/cc and a compressed density of 2.0 to 3.1 g/cc. The positive electrode active substance particles can be produced by calcining a mixture of precursor particles comprising the element A, Mn, Ni and/or Co, and a lithium compound.

The present invention relates to lithium manganate particles having a primary particle diameter of not less than 1 &#x3bc;m and an average particle diameter (D) of not less than 2 &#x3bc;m and not more than 10 &#x3bc;m as measured by a particle size distribution meter, and forming particles having substantially a single phase, which have a composition represented by the following chemical formula:LiMnY1O+Y2

Lithium manganate particles for non-aqueous electrolyte secondary battery, process for producing the same, and non-aqueous electrolyte secondary battery

The present invention relates to lithium composite compound particles having a composition represented by the formula: LiNiCoMO(M=B or Al), wherein the lithium composite compound particles have an ionic strength ratio A (LiO/NiO) of not more than 0.3 and an ionic strength ratio B (LiCO/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.

Lithium composite compound particles and process for producing the same, and non-aqueous electrolyte secondary battery

Positive electrode active substance particles including a compound having at least a crystal system belonging to a space group of R&#x2212;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&#x3b8;=20.8&#xb1;1&#xb0; 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&#x3b8;=18.6&#xb1;1&#xb0; 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.

The present invention aims at providing lithium manganate having a high output and an excellent high-temperature stability. The above aim can be achieved by lithium manganate particles having a primary particle diameter of not less than 1 &#x3bc;m and an average particle diameter (D) of kinetic particles of not less than 1 &#x3bc;m and not more than 10 &#x3bc;m, which are substantially in the form of single crystal particles and have a composition represented by the following chemical formula: LiMnYOin which Y is at least one element selected from the group consisting of Al, Mg and Co; x and y satisfy 0.03&#x2266;x&#x2266;0.15 and 0.05&#x2266;y&#x2266;0.20, respectively, wherein the Y element is uniformly dispersed within the respective particles, and an intensity ratio of I(400)/I(111) thereof is not less than 33% and an intensity ratio of I(440)/I(111) thereof is not less than 16%.

Lithium manganate for non-aqueous electrolyte secondary battery, process for producing the same, and non-aqueous electrolyte secondary battery

The present invention relates to Li&#x2014;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&#x2014;Ni-based composite oxide particles can be produced by allowing an oxide and a hydroxide comprising Mn to mechanically adhere to Li&#x2014;Ni-based oxide comprising Co and/or Al; and then heat-treating the obtained material at a temperature of not lower than 400&#xb0; C. and not higher than 1,000&#xb0; C. The Li&#x2014;Ni-based composite oxide particles of the present invention are improved in thermal stability and alkalinity.

Li&#x2014;Ni-based composite oxide particles for non-aqueous electrolyte secondary battery, process for producing the same, and non-aqueous electrolyte secondary battery

The present invention relates to lithium manganate particles having a primary particle diameter of 1 to 8 &#x3bc;m and forming substantially single-phase particles, which have a composition represented by the following chemical formula:LiMnY1O+Y2in which Y1 is at least one element selected from the group consisting of Ni, Co, Mg, Fe, Al, Cr and Ti; Y2 is P and is present in an amount of 0.01 to 0.6 mol % based on Mn; and x and y satisfy 0.03&#x2266;x&#x2266;0.15 and 0.05&#x2266;y&#x2266;0.20, respectively, and

The present invention relates to cobalt oxide particles useful as a precursor of a cathode active material for a non-aqueous electrolyte secondary cell which is capable of showing a stable crystal structure by insertion reaction therein, and producing a non-aqueous electrolyte secondary cell having a high safety and especially a high heat stability, a process for producing the cobalt oxide particles, a cathode active material for a non-aqueous electrolyte secondary cell using the cobalt oxide particles, a process for producing the cathode active material, and a non-aqueous electrolyte secondary cell using the cathode active material.

Cobalt oxide particles and process for producing the same, cathode active material for non-aqueous electrolyte secondary cell and process for producing the same, and non-aqueous electrolyte secondary cell

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Yamaguchi-ken, Japan

Hideaki Sadamura