Toda Kogyo Corporation

Denka Company Limited

Ryuta Masaki

Akihisa Kajiyama

Kazutoshi Matsumoto

Daisuke Morita

Kazumichi Koga

Hiroaki Masukuni

Hideaki Sadamura

Hiroyasu Watanabe

Shoichi Fujino

Manabu Yamamoto

Tsuyoshi Wakiyama

Takashi Kawasaki

Hiroshi Yokota

Kenji Okinaka

Seiji Okazaki

Akira Yoda

Teruaki Santoki

Osamu Sasaki

Minoru Yamasaki

Wataru Oda

Toshiaki Hiramoto

Akino Sato

Takahiko Sugihara

Taro Inada

Masashi Kobino

Katsuhiro Fujita

Takayuki Yamamura

Tetsuya Kodaira

Tetsuya Kashima

Akino Ito

Provided herein are processes for producing positive electrode active substance particles for non-aqueous electrolyte secondary batteries which is excellent in life characteristics of a battery with respect to a repeated charging and discharging performance thereof, as well as a non-aqueous electrolyte secondary battery. In particular, provided herein are processes for producing a positive electrode active substance for non-aqueous electrolyte secondary batteries comprising lithium transition metal layered oxide having a composition represented by the formula: Li(NiCoMn)Owherein a is 1.0&#x2264;a&#x2264;1.15; x is 0&#x3c;x&#x3c;1; and y is 0&#x3c;y&#x3c;1, in which the positive electrode active substance is in the form of secondary particles formed by aggregating primary particles thereof, and a coefficient of variation of a compositional ratio: Li/Me wherein Me is a sum of Ni, Co and Mn as measured on a section of the secondary particle is not more than 25%.

Processes for preparing positive electrode active substance for non-aqueous electrolyte secondary batteries

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

An object of the present invention is to provide a positive electrode mixture capable of conducting stable charging and discharging with a less amount of gasses generated which has an operating voltage or an initial crystal phase transition voltage of not less than 4.5 V on the basis of lithium. The present invention relates to a positive electrode mixture comprising carbon black having a bulk density of not more than 0.1 g/cm, a crystallite size of 10 to 40 &#x212b;, an iodine adsorption of 1 to 150 mg/g, a volatile content of not more than 0.1% and a metal impurity content of not more than 20 ppm, and a positive electrode active substance having an operating voltage or an initial crystal phase transition voltage of not less than 4.5 V on the basis of lithium.

Positive electrode mixture 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.

The present invention relates to positive electrode active substance particles for non-aqueous electrolyte secondary batteries, comprising an oxide having a spinel structure and comprising at least Li and Mn as main components and an oxide comprising at least Li and Zr, in which the oxide comprising at least Li and Zr forms a mixed phase comprising two or more phases, and a content of the oxide comprising at least Li and Zr in the positive electrode active substance particles is 0.1 to 4% by weight. The present invention provides positive electrode active substance particles for non-aqueous electrolyte secondary batteries which are excellent in high-temperature characteristics and a process for producing the positive electrode active substance particles, and a non-aqueous electrolyte secondary battery.

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

The present invention relates to nickel-cobalt-manganese-based compound particles which have a volume-based average secondary particle diameter (D50) of 3.0 to 25.0 &#x3bc;m, wherein the volume-based average secondary particle diameter (D50) and a half value width (W) of the peak in volume-based particle size distribution of secondary particles thereof satisfy the relational formula: W&#x2266;0.4&#xd7;D50, and can be produced by dropping a metal salt-containing solution and an alkali solution to an alkali solution at the same time, followed by subjecting the obtained reaction solution to neutralization and precipitation reaction. The nickel-cobalt-manganese-based compound particles according to the present invention have a uniform particle size, a less content of very fine particles, a high crystallinity and a large primary particle diameter, and therefore are useful as a precursor of a positive electrode active substance used in a non-aqueous electrolyte secondary battery.

Nickel-cobalt-maganese-based compound particles and process for producing the nickel-cobalt-manganese-based compound particles, lithium composite oxide particles and process for producing the lithium composite oxide particles, and non-aqueous electrolyte secondary battery

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Yamaguchi-ken, Japan

Ryuta Masaki