Abstract: A cathode active material for a lithium-ion secondary battery includes a spinel lithium manganese composite oxide expressed by the general formula: Lia(NixMn2?x?q?rQqRr)O4, wherein 0.4?x?0.6, 0<q, 0?r, x+q+r<2, 0<a<1.2, Q is at least one element selected from the group consisting of Na, K and Ca, and R is at least one element selected from the group consisting of Li, Be, B, Mg and Al.

Abstract: A life of a secondary battery is extended, increase in a resistance when storing a secondary battery at an elevated temperature is prevented, and increase in a resistance during a charge-discharge cycle is prevented. A positive electrode active material comprising a lithium manganate and a lithium nickelate are used. The lithium manganate is a compound represented by the following formula (1) or the compound in which some of Mn or O sites are replaced with another element: Li1+xMn2?xO4??(1) (in the above-shown formula (1), 0.15?x?0.24).

Abstract: A positive electrode active material containing lithium manganate having a spinel structure is used, wherein the value of a* of the L*a*b* color specification system is made to satisfy the requirement: ?3.2?a*??1.4. Or, the value of a* is made to satisfy the requirement: ?5.8?a*??4.2. Or, the value of L* is made to satisfy the requirement: 24?L*?27.

Abstract: A cathode active material having an average discharge potential of 4.5 V or more with respect to Li metal is used, and as an electrolyte, a solvent with higher dielectric constant such as ethylene carbonate, and at least one of dimethyl carbonate and ethylmethyl carbonate are used in combination. A higher operating voltage can be realized while suppressing capacity reduction after cycles and reduction of reliability at a higher temperature.

Abstract: A cathode active material for a lithium-ion secondary battery includes a spinel lithium manganese composite oxide expressed by the general formula: Lia(NixMn2−x−q−rQqRr)O4, wherein 0.4≦x≦0.6, 0<q, 0≦r, x+q+r<2, 0<a<1.2, Q is at least one element selected from the group consisting of Na, K and Ca, and R is at least one element selected from the group consisting of Li, Be, B, Mg and Al.

Abstract: A cathode active material for a secondary battery including a lithium-manganese composite oxide having a spinel structure and represented by the following general formula (I), Lia(MxMn2-x-y-zYyAz)(O4-wZw) (I), wherein 0.5≦x≦1.2, 0≦y, 0≦z, x+y+z<2, 0≦a≦1.2 and 0≦w≦1; M contains at least Co and may further contains at least one element selected from the group consisting of Ni, Fe, Cr and Cu; Y is at least one element selected lo from the group consisting of Li, Be, B, Na, Mg, Al, K and Ca; A is at least one of Ti and Si; and Z is at least one of F and Cl. When the cathode active material for the secondary battery is used as the cathode for the a secondary battery, a higher operating can be realized while suppressing the reliability reduction such as the capacity decrease after the cycles and the deterioration of the crystalline structure at a higher temperature.

Abstract: A non-aqueous-electrolyte based secondary battery includes a mixture of lithium manganate and lithium nickelate as a cathode active material, and includes at least one element selected from Bi, Pb, Sb and Sn.

Abstract: A secondary battery including an electricity generating element, which includes at least a positive electrode implemented by a lithium-manganese compound oxide, a negative electrode, an electrolyte and a separator, and films encasing the electricity generating element is disclosed. The secondary battery further includes a composition causing the electrolyte to react with water to thereby produce hydrogen ions, and a hydrogen ion uptaking agent so positioned as to contact the electrolyte existing in the battery. The battery is desirable in charge-discharge cycle characteristic, storage characteristic, and safety. In addition, the battery swells little despite a repeated charge-discharge cycle or storage.

Abstract: A positive electrode of a nonaqueous electrolyte solution secondary battery comprises (A) a lithium-manganese composite oxide and (B1) at least one lithium-nickel composite oxide which has a specific surface area X of 0.3≦X (m2/g) and which is selected from a group consisting of LiNiO2, Li2NiO2, LiNi2O4, Li2Ni2O4 and LiNi1−xMxO2 (0<x≦0.5 is satisfied, and M represents at least one metal element selected from a group consisting of Co, Mn, Al, Fe, Cu and Sr), whereby it is possible to obtain a nonaqueous electrolyte solution secondary battery which is superior in battery properties, especially charge and discharge cycle properties, retention properties and safety.

Abstract: The present invention provides a lithium manganese oxide, wherein a content of sulfur is not more than 0.32% by weight, and an averaged diameter of pores is not less than 120 nanometers, and the lithium manganese oxide is represented by Li1+xMn2−x−yMyO4, where “M” is at least one of metals and 0.032≦x≦0.182; 0≦y≦0.2, and also provides a non-aqueous electrolyte secondary battery using the above lithium manganese compound oxide as a positive electrode active material.

Abstract: A positive electrode active material for a secondary battery contains a spinel lithium manganese composite oxide expressed by a general formula of Lia(MxMn2−x−yAy)O4 where x, y and z are positive values which satisfy 0.4<x, 0<y, x+y<2, and 0<a<1.2. “M” denotes Ni and at least one metal element selected from the group consisting of Co, Fe, Cr and Cu. “A” denotes at least one metal element selected from the group consisting of Si and Ti. The ratio y of A has a value of 0.1<y in case where A includes only Ti. Accordingly, it is possible to acquire a material for the positive electrode of a lithium ion secondary battery, which has a high capacity and a high energy density with a high voltage of 4.5 V or higher with respect to Li.

Abstract: In a secondary battery using an Li-containing oxide for a positive electrode, a nitride such as TiN or ZrN or an oxide such as MoO3, TiO, Ti2O3, NbO, or RuO2 is employed as an electroconductive giving agent. Thereby a secondary battery that is excellent in battery performance, especially excellent in capacity retaining performance and charge and discharge cycle performance at a high temperature, and more specifically, a high-voltage secondary battery the energy density of which is high can be obtained.

Abstract: A nonaqueous electrolyte secondary battery uses a lithium manganese composite oxide as its positive electrode active material, and is improved in cycle life at a high temperature, and also improved in capacity retention properties. A negative electrode active material of the battery is capable of doping and undoping a lithium ion. The buttery contains in its inside at least one of: an oxide of at least one element selected from the group consisting of La, Sr, Nd, and Sm; a carbonate of at least one element selected from the group consisting of La, Sr, Nd, and Sm; and, a composite oxide of manganese combined with at least one element selected from the group consisting of La, Sr, Nd, and Sm. The battery uses an electrolyte, the electrolyte containing LiPF6 or LiBF4 as its supporting salt.

Abstract: A secondary battery including an electricity Generating element, which includes at least a positive electrode implemented by a lithium-manganese compound oxide, a negative electrode, an electrolyte and a separator, and films encasing the electricity generating element is disclosed. The secondary battery further includes a composition causing the electrolyte to react with water to thereby produce hydrogen ions, and a hydrogen ion uptaking agent so positioned as to contact the electrolyte existing in the battery. The battery is desirable in charge-discharge cycle characteristic, storage characteristic, and safety. In addition, the battery swells little despite a repeated charge-discharge cycle or storage.