Abstract: The present invention provides a lithium manganese-based composite oxide represented by the compositional formula: Li1+x(Mn1-m-nFemTin)1?xO2, wherein 0<x<?, 0?m?0.75, 0.01?n?0.75, and 0.01?m+n<1, and comprising a crystal phase of layered rock-salt type structure. The composite oxide is capable of maintaining an average discharge voltage of 3 V or more over long charge/discharge cycles. The composite oxide can be prepared using lower-cost starting materials, and exhibits improved charge/discharge characteristics over conventional low-cost positive electrode materials.

Abstract: The present invention provides a lithium manganese-based composite oxide represented by the compositional formula: Li1+x(Mnl-m-nFemTin)1-xO2, wherein 0<x<?, 0?m?0.75, 0.01?n?0.75, and 0.01?m+n<1, and comprising a crystal phase of layered rock-salt type structure. The composite oxide is capable of maintaining an average discharge voltage of 3 V or more over long charge/discharge cycles. The composite oxide can be prepared using lower-cost starting materials, and exhibits improved charge/discharge characteristics over conventional low-cost positive electrode materials.

Abstract: The present invention provides a single-phase lithium ferrite based oxide which is suitable as a cathode material for a secondary battery, a process for preparing the oxide, and its uses, the oxide having a layered rock salt-type structure and comprising lithium ferrite (LiFeO2)−Li2-xMO3-y solid solution wherein M is at least one species selected from the group consisting of Mn, Ti and Sn, 0≦x<2, 0≦y≦1 such that the proportion of iron is 0.1≦Fe/(Fe+M)≦0.9.

Abstract: A lithium cobalt oxide (LiCoO2) having a layered rock-salt type structure produced at low temperatures by hydrothermally treating at least one water-soluble cobalt salt in an aqueous solution containing a water-soluble lithium salt and an alkali metal hydroxide at 105 to 300° C. in the presence of an oxidizing agent. An inexpensive salt of divalent cobalt is used as a starting material in this process. The lithium cobalt oxide thus obtained is useful as a cathode material for rechargeable lithium batteries.

Abstract: The present invention provides a single-phase lithium ferrite based oxide which is suitable as a cathode material for a secondary battery, a process for preparing the oxide, and its uses, the oxide having a layered rock salt-type structure and comprising lithium ferrite (LiFeO2)- Li2-xMO3-y solid solution wherein M is at least one species selected from the group consisting of Mn, Ti and Sn, 0≦×<2, 0 ≦y ≦1 such that the proportion of iron is 0.1≦Fe/(Fe+M)≦0.9.

Abstract: A sintered lithium titaniumphosphate is produced by subjecting the powder of a mixture consisting of a Li source, a Ti source, and a P source to spark plasma sintering under an increased pressure.

Abstract: Hydrothermal treatment of at least one manganese source material, for example, an oxide of manganese, such as Mn2O3, MnO, or MnO2, in an aqueous solution containing at least one water-soluble lithium salt, such as lithium hydroxide, lithium chloride, lithium nitrate, lithium fluoride, or lithium bromide, and an alkaline metal hydroxide, such as potassium hydroxide, at 130 to 300° C. can realize the preparation of a lithium manganese oxide (LiMnO2) having a layered rock-salt structure in a single stage.

Abstract: A method of determining the charge and/or discharge capacities of non-aqueous batteries with an operating voltage of about 4 volts, is provided including determining an inverse molar susceptibility value at each of a plurality of different temperatures for a plurality of lithium manganese spinel oxide cathode materials having different respective Mn valencies; plotting the inverse molar susceptibility values against temperatures for each of the plurality of lithium manganese spinel oxide cathode materials; determining values of at least one of two paramagnetic parameters, Weiss temperature and effective magnetic moment, by obtaining the temperature dependence of the above inverse molar susceptibility from a plot derived from the Curie-Weiss law, the Weiss temperature corresponding to a temperature value extrapolated to a zero point of the inverse molar susceptibility and the effective magnetic moment being obtainable from the gradient value of the plot; producing plural rechargeable lithium batteries in which

Abstract: A process for preparing LiFeO.sub.2 having a layered rock salt type structure is characterized in that at least one member selected from the group consisting of water-soluble iron salts, iron hydroxides, iron oxide hydroxides, and metallic iron is subjected to a hydrothermal treatment in an aqueous solution containing lithium hydroxide and at least one of sodium hydroxide and potassium hydroxide at 130.degree. to 300.degree. C.

Abstract: Yellow iron oxide crystals having lengths in the range of 100 to 1000 nm and a major axis/motor axis length ratio in the range of 1.5 to 4.5 are produced by adding an aqueous ferric salt solution to an aqueous alkali solution, causing the two solutions to react with each other at a temperature in the range of -5.degree. to 30.degree. C. thereby inducing precipitation of iron hydroxide, allowing the precipitate to age, then subjecting the aged precipitate to a hydrothermal treatment thereby producing crystals and, when necessary, further allowing the crystals to grow.

Abstract: In the manufacture of iron oxide flakes by the steps of mixing an aqueous ferric salt solution with an aqueous alkali solution for thereby inducing an amorphous precipitate and subjecting the precipitate to a hydrothermal treatment, iron oxide flakes of an increased flake size are obtained by adding boric acid or a salt thereof to the mixture prior to the step of hydrothermal treatment.

Abstract: Synthetic yellow iron oxide (.alpha.-FeOOH) is dispersed in an aqueous 0 - 10N alkali solution and the resultant dispersion is subjected to a hydrothermal treatment at 100.degree.- 250.degree.C. This treatment improves the synthetic yellow iron oxide in that it converts imperfect crystals present in said iron oxide into perfect crystals, changes particles thereof from the shape of needles to that of rods, makes the particle size substantially uniform and heightens the resistivity thereof to heat by about 50.degree.C. The modified synthetic yellow iron oxide thus obtained is innoxious and can be used as a pigment in paints.