Toda Kogyo Corporation

Hiroaki Masukuni

Kazumichi Koga

Kazutoshi Matsumoto

Hideaki Sadamura

Masayuki Uegami

Akihisa Kajiyama

Ryuta Masaki

Hiroyasu Watanabe

Manabu Yamamoto

Daisuke Morita

Kazutoshi Ishizaki

Positive electrode active material particle powder includes lithium manganese oxide particle powder having Li and Mn as main components and a cubic spinel structure with an Fd-3m space group. The lithium manganese oxide particle powder is composed of secondary particles, which are aggregates of primary particles, an average particle diameter (D50) of the secondary particles being from 4 &#x3bc;m to 20 &#x3bc;m, and at least 80% of the primary particles exposed on surfaces of the secondary particles each have a polyhedral shape in which each (111) plane thereof is adjacent to at least one (100) plane thereof.

Positive electrode active material particle powder for non-aqueous electrolyte secondary battery, method for producing 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

Positive electrode active material particle powder includes: lithium manganese oxide particle powder having Li and Mn as main components and a cubic spinel structure with an Fd-3m space group. The lithium manganese oxide particle powder is composed of secondary particles, which are aggregates of primary particles, an average particle diameter (D50) of the secondary particles being from 4 &#x3bc;m to 20 &#x3bc;m, and at least 80% of the primary particles exposed on surfaces of the secondary particles each have a polyhedral shape having at least one plane that is adjacent to two planes.

Positive electrode active material particle powder for non-aqueous electrolyte secondary battery, method for manufacturing same, and non-aqueous electrolyte secondary battery

Positive electrode active material particle powder includes: lithium manganese oxide particle powder having Li and Mn as main components and a cubic spinel structure with an Fd-3m space group. The lithium manganese oxide particle powder is composed of secondary particles, which are aggregates of primary particles, an average particle diameter (D50 ) of the secondary particles being from 4 &#x3bc;m to 20 &#x3bc;m, and at least 80% of the primary particles exposed on surfaces of the secondary particles each have a polyhedral shape having at least one (110) plane that is adjacent to two (111) planes.

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 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 positive electrode active substance particles for lithium ion batteries, comprising lithium manganate particles comprising Li and Mn as main components and having a cubic spinel structure (Fd-3m), wherein primary particles of the positive electrode active substance have a dodecahedral or higher-polyhedral shape in which none of crystal planes equivalent to the (111) plane are located adjacent to each other, and flat crystal planes are crossed with each other to form a clear ridge, and an average primary particle diameter of the primary particles is not less than 1 &#x3bc;m and not more than 20 &#x3bc;m. The positive electrode active substance particles according to the present invention are excellent in packing property, load characteristics and high-temperature stability.

Positive electrode active material for secondary batteries with nonaqueous electrolytic solution, process for the production of the active material, and secondary batteries with nonaqueous electrolytic solution

According to the present invention, there is provided a process for producing lithium manganate particles having a high output and an excellent high-temperature stability. The present invention relates to a process for producing lithium manganate particles comprising the steps of mixing a lithium compound, a manganese compound and a boron compound with each other; and calcining the resulting mixture in a temperature range of 800 to 1050&#xb0; C., wherein an average particle diameter (D) of the boron compound is not more than 15 times an average particle diameter (D) of the manganese compound, and wherein the lithium manganate particles have a composition represented by the following chemical formula:LiMnY1O+Bin which Y1 is at least one element selected from the group consisting of Ni, Co, Mg, Fe, Al, Cr and Ti, and x and y satisfy the conditions of 0.03&#x2266;x&#x2266;0.15 and 0&#x2266;y&#x2266;0.20, respectively.

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Yamaguchi, Japan

Hiroaki Masukuni