Tanaka Chemical Corporation

Nec Corporation

Sumitomo Chemical Company, Limited

Nec C Orporation

Sanoh Industrial Co., Ltd.

Kyousuke Doumae

Ryota Yuge

Mitsuharu Tabuchi

Hideka Shibuya

Noriyuki Tamura

Kenji Takamori

Sadanori Hattori

Kentaro Kuratani

Kentaro Nakahara

Yuichiro Imanari

Hiroyuki Kurita

Daisuke Yamashita

Tetsuri Nakayama

Kimiyasu Nakao

Hideki Kurihara

Masashi Inamoto

Yuichiro Takimoto

Atsushi Honda

Kazuyuki Sugita

Yoshiyuki Arai

Takashi Kitamoto

The invention discloses a positive electrode active material for a magnesium secondary battery or lithium ion secondary battery, including: a particle including a nucleus and a crystal of vanadium oxide grown from the nucleus as a starting point and having a maximum length of 5 μm or less in the major axis direction.

Positive electrode active material, method for producing positive electrode active material, positive electrode, and secondary battery

A positive electrode active material for a lithium secondary battery, comprising a lithium-containing composite metal oxide in the form of secondary particles formed by aggregation of primary particles capable of being doped and undoped with lithium ions, each of the secondary particles having on its surface a coating layer, the positive electrode active material satisfying the following requirements (1) to (3): (1) the metal oxide has an &#x3b1;-NaFeOtype crystal structure of following formula (A):Li(NiCoM)O&#x2003;&#x2003;(A)wherein 0.9&#x2264;a&#x2264;1.2, 0.9&#x2264;b&#x3c;1, 0&#x3c;c&#x2264;0.1, 0.9&#x3c;b+c&#x2264;1, and Mrepresents at least one optional metal selected from Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Cu, Zn, Ga, Ge, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In and Sn; (2) the coating layer comprises Li and M, wherein Mrepresents at least one optional metal selected from Al, Ti, Zr and W; and (3) the active material has an average secondary particle diameter of 2 to 20 &#x3bc;m, a BET specific surface area of 0.1 to 2.5 m/g, and a value of 1.0 to 2.0 as a tamped density/untamped density ratio of the active material.

Positive electrode active material for lithium secondary batteries, positive electrode for lithium secondary batteries, and lithium secondary battery

A lithium-manganese composite oxide containing a lithium-iron-manganese composite oxide represented by the composition formula. Li(FeNiMn)O, where 0&#x3c;x&#x3c;&#x2153;, 0&#x2264;w&#x3c;0.8, 0&#x3c;y&#x3c;1, 0&#x3c;z&#x3c;0.5, y+z&#x3c;1, and 0&#x2264;&#x3b4;&#x3c;0.5, in which at least in a state of charge of a lithium ion battery using the lithium-manganese composite oxide as a positive-electrode active material, at least some of iron atoms are pentavalent.

Lithium-manganese composite oxide, and method for producing same, and positive electrode material, positive electrode and lithium ion secondary battery using same

There is provided a lithium-iron-manganese-based composite oxide capable of providing a lithium-ion secondary battery which has a high capacity retention rate in charge/discharge cycles and in which the generation of a gas caused by charge/discharge cycles is suppressed. A lithium-iron-manganese-based composite oxide having a layered rock-salt structure, wherein at least a part of the surface of a lithium-iron-manganese-based composite oxide represented by the following formula is coated with an oxide of at least one metal selected from the group consisting of La, Pr, Nd, Sm and Eu:LiMMnMFeO wherein 1.05&#x2264;x&#x2264;1.32, 0.33&#x2264;y&#x2264;0.63, 0.06&#x2264;z&#x2264;0.50, 0&#x3c;p&#x2264;0.63, 0.06&#x2264;q&#x2264;0.50, 0&#x2264;&#x3b4;&#x2264;0.80, y&#x2265;p, and z&#x2265;q; Mis at least one element selected from Ti and Zr; and Mis at least one element selected from the group consisting of Co, Ni and Mn.

Lithium-iron-manganese-based composite oxide and lithium-ion secondary battery using same

A positive electrode active material, which has a crystallite size &#x3b1;/crystallite size &#x3b2; ratio (&#x3b1;/&#x3b2;) of 1 to 1.75 or less, wherein the crystallite size &#x3b1; is within a peak region of 2&#x3b8;=18.7&#xb1;1&#xb0; and the crystallite size &#x3b2; is within a peak region of 2&#x3b8;=44.6&#xb1;1&#xb0;, each determined by a powder X-ray diffraction measurement using Cu-K&#x3b1; ray, and has a composition represented by formula (I) below:Li[Li(NiCoMnM)]O&#x2003;&#x2003;(I)wherein 0&#x2264;x&#x2264;0.2, 0.3&#x3c;a&#x3c;0.7, 0&#x3c;b&#x3c;0.4, 0&#x3c;c&#x3c;0.4, 0&#x2264;d&#x3c;0.1, a+b+c+d=1, and M is at least one metal selected from the group consisting of Fe, Cr, Ti, Mg, Al and Zr.

Positive electrode active material for lithium secondary battery, positive electrode for lithium secondary battery, and lithium secondary battery

There is provided a lithium-iron-manganese-based composite oxide capable of providing a lithium-ion secondary battery which has a high capacity retention rate in charge/discharge cycles and in which the generation of a gas caused by charge/discharge cycles is reduced. A lithium-iron-manganese-based composite oxide having a layered rock-salt structure, wherein at least a part of the surface of a lithium-iron-manganese-based composite oxide represented by the following formula (1) is coated with an inorganic material: LiMMnMFeO(1) (wherein 1.05&#x2264;x&#x2264;1.32, 0.33&#x2264;y&#x2264;0.63, 0.06&#x2264;z&#x2264;0.50, 0&#x3c;p&#x2264;0.63, 0.06&#x2264;q&#x2264;0.50, 0&#x2264;&#x3b4;&#x2264;0.80, y&#x2265;p, and z&#x2265;q; Mis at least one element selected from Ti and Zr; and Mis at least one element selected from the group consisting of Co, Ni and Mn).

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Fukui, Japan

Kyousuke Doumae