Toda Kogyo Corporation

Manabu Yamamoto

Hideaki Sadamura

Osamu Sasaki

Daisuke Nishikawa

Akihisa Kajiyama

Kazumichi Koga

Kazutoshi Matsumoto

Hiroyasu Watanabe

Hiroaki Masukuni

Ryuta Masaki

Daisuke Morita

Teruaki Santoki

Kazutoshi Ishizaki

Kazuhiko Kikuya

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.

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.

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.

Growing community of inventors

Yamaguchi-ken, Japan

Manabu Yamamoto