Toda Kogyo Corporation

Hiroyasu Watanabe

Hideaki Sadamura

Shoichi Fujino

Norimiki Sugiyama

Hideaki Maeda

Taiki Imahashi

Akihisa Kajiyama

Kazumichi Koga

Kazutoshi Matsumoto

Hiroaki Masukuni

Kazuhiko Kikuya

Ryuta Masaki

Manabu Yamamoto

Daisuke Morita

Xiang Sun

Osamu Sasaki

Kazutoshi Ishizaki

Mitsuaki Hatatani

Satoshi Nakamura

Nobuyuki Tagami

The present invention provides lithium nickelate-based positive electrode active substance particles having a high energy density which are excellent in charge/discharge cycle characteristics when highly charged, and hardly suffer from generation of gases upon storage under high-temperature conditions, and a process for producing the positive electrode active substance particles, as well as a non-aqueous electrolyte secondary battery. The present invention relates to positive electrode active substance particles each comprising a core particle X comprising a lithium nickelate composite oxide having a layer structure which is represented by the formula: LiNiCoMOwherein M is at least one element selected from the group consisting of Mn, Al, B, Mg, Ti, Sn, Zn and Zr; a is a number of &#x2212;0.1 to 0.2 (&#x2212;0.1&#x2022;a&#x2022;0.2); b is a number of 0.05 to 0.5 (0.05&#x2022;b&#x2022;0.5); and c is a number of 0.01 to 0.4 (0.01&#x2022;c&#x2022;0.4); a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si; and a coating compound Z comprising an Li element, in which a content of lithium hydroxide LiOH in the positive electrode active substance particles is not more than 0.40% by weight, a content of lithium carbonate LiCOin the positive electrode active substance particles is not more than 0.65% by weight, and a weight ratio of the content of lithium carbonate to the content of lithium hydroxide is not less than 1.

Lithium nickelate-based positive electrode active substance particles and process for producing the same, 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-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 lithium nickelate-based positive electrode active substance particles having a high energy density which are excellent in charge/discharge cycle characteristics when highly charged, and hardly suffer from generation of gases upon storage under high-temperature conditions, and a process for producing the positive electrode active substance particles, as well as a non-aqueous electrolyte secondary battery. The present invention relates to positive electrode active substance particles each comprising a core particle X comprising a lithium nickelate composite oxide having a layer structure which is represented by the formula: LiNiCoMOwherein M is at least one element selected from the group consisting of Mn, Al, B, Mg, Ti, Sn, Zn and Zr; a is a number of &#x2212;0.1 to 0.2 (&#x2212;0.1&#x2264;a&#x2264;0.2); b is a number of 0.05 to 0.5 (0.05&#x2264;b&#x2264;0.5); and c is a number of 0.01 to 0.4 (0.01&#x2264;c&#x2264;0.4); a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si; and a coating compound Z comprising an Li element, in which a content of lithium hydroxide LiOH in the positive electrode active substance particles is not more than 0.40% by weight, a content of lithium carbonate LiCOin the positive electrode active substance particles is not more than 0.65% by weight, and a weight ratio of the content of lithium carbonate to the content of lithium hydroxide is not less than 1.

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 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 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

The present invention aims to provide lithium composite compound particles which can exhibit good cycle characteristics and an excellent high-temperature storage property when used as a positive electrode active substance of a secondary battery, and a secondary battery using the lithium composite compound particles. The present invention relates to lithium composite compound particles having a composition represented by the compositional formula: LiNiCoMnMO, in which the lithium composite compound particles have an ionic strength ratio A (LiO/NiO) of not more than 0.5 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 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

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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Ube, Japan

Hiroyasu Watanabe