The Furukawa Battery Co., Ltd.

Furukawa Denchi Kabushiki Kaisha

Sumitomo Osaka Cement Co., Ltd.

Tokyo Metropolitan University

The Furukawa Electric Co., Ltd.

Hidetoshi Abe

Kiyoshi Kanamura

Mitsumasa Saito

Tomonori Suzuki

Takashi Eguro

Michio Ohkubo

Jun Furukawa

Toshimichi Takada

Toshio Tani

Naoki Uno

Michihiro Shimada

Daisuke Monma

Haruo Sawa

Yosuke Hirayama

Miyu Aita

A method of manufacturing a multicomponent lithium phosphate compound particle with an olivine structure of formula LiM1M2PO, M1 is Fe, Mn or Co; Y satisfies 0.9&#x2266;Y&#x2266;1.2; M2 is Mn, Co, Mg, Ti or Al; and Z satisfies 0&#x3c;Z&#x2266;0.1, in which the M2 concentration is continuously lowered from a surface of the particle to a core portion of the particle. The method includes mixing a lithium M1 phosphate compound with an olivine structure of formula LiM1PO, M1 is Fe, Mn or Co, and X satisfies 0.9&#x2266;X&#x2266;1.2, and a precursor of a lithium M2 phosphate compound with an olivine structure of formula LiM2PO, M2 is Mn, Co, Mg, Ti or Al, and X satisfies 0.9&#x2266;X&#x2266;1.2, to form a mixture; and subjecting the mixture to heating in an inert atmosphere or a vacuum.

Method of manufacturing a multicomponent system lithium phosphate compound particle having an olivine structure

An object of the present invention is to provide a cathode active material which contains small-particle sized and low-crystalline lithium transition metal silicate and which undergoes charge-discharge reaction at room temperature. The cathode active material for a non-aqueous electrolyte secondary battery is characterized by containing a lithium transition metal silicate and exhibits diffraction peaks having half widths of 0.175 to 0.6&#xb0;, the peaks observed through powder X-ray diffractometry within a 2&#x3b8; range of 5 to 50&#xb0;.

Cathode active material, cathode, secondary battery and manufacturing methods for the same

There is disclosed a multi-component system lithium phosphate compound particles having an olivine structure and represented by a general formula of LiM1M2POin which M1 is one metal element selected from the group consisting of Fe, Mn and Co, Y is a number satisfying a formula of 0.9&#x2266;Y&#x2266;1.2, M2 is at least one metal element selected from the group consisting of Mn, Co, Mg, Ti and Al, and Z is an number satisfying a formula of 0&#x3c;Z&#x2266;0.1, wherein a concentration of the metal element M2 existing on a surface of the particle is higher than the concentration of that existing in core portion of the particle and that the concentration of the metal element M2 is continuously lowered from the surface of particle to a core portion of the particle.

Multi-component-system lithium phosphate compound particle having an olivine structure and lithium secondary battery employing the lithium phosphate compound particle as a positive electrode material

There is disclosed a lead storage battery comprising a group of plates housed in a battery jar, and an electrolyte injected therein to impregnate the group of plates with the electrolyte, thus performing formation treatment, the lead storage battery being adapted to be used in a partial state of charge where the state of charge is confined within the range of more than 70% to less than 100%, wherein the group of plates are formed of a stack constituted by a large number of negative substrates comprising grid substrates filled with a negative active material, by a large number of positive substrates comprising grid substrates filled with a positive active material, and by a porous separator interposed between the negative electrodes and positive electrodes, and the electrolyte contains at least one kind of ion selected from the group consisting of aluminum ions, selenium ions and titanium ions.

Lead storage battery and manufacturing method of the same

There is provided a method of producing an active material of a positive electrode used for an alkaline secondary battery which is difficult to be oxidized, and high in its reactivity with an alkaline electrolyte to form a cobalt electric conductive matrix improved in electric conductivity. The method of producing thereof is characterized in that nickel hydroxide powder is dispersed in an aqueous solution of a strongly acidic cobalt salt and the dispersed solution thereof is, while being stirred, added gradually with an aqueous alkali solution to made to react one with another to precipitate a cobalt hydroxide while maintaining the reaction solution in the region of acidity to neutrality, and a solid part in which the cobalt hydroxide is mixed in the nickel hydroxide is separated from the reaction solution which is in the region of acidity to neutrality after the completion of the reaction, and is then washed with water. By this method of producing, there is obtained an active material of a positive electrode used for an alkaline secondary battery in which the amorphous to microcrystal cobalt hydroxide is mixed in the nickel hydroxide. Thus, using this active material of the positive electrode, a paste-type nickel electrode improved in utilization rate is obtained, and using the nickel electrode, an alkaline storage battery which has a high capacity and is excellent in the battery characteristics such as discharging characteristics, etc. is obtained.

Method for manufacturing positive pole active material for alkaline secondary battery, paste nickel pole, and alkaline secondary battery and method for manufacturing thereof

Disclosed is a novel process for preparing a compound, in which materials difficult to prepare at low temperature can be prepared even if the temperature is such a low temperature as room temperature. In this process, a solid catalyst is disposed in a vessel, a sub-reaction field f is formed on the surface of the solid catalyst, and materials for reaction are supplied to the sub-reaction field f whereby the reaction is progressed to synthesize an objective compound.

Process for preparing compound

There is provided a battery activating method for an alkaline rechargeable battery, in which the capacity is not decreased even when the battery voltage is decreased by continuous load connection or self discharge. The temperature at the start of charging is set at 30.degree. to 80.degree. C. when activation is performed by charging the alkaline rechargeable battery having a nickel electrode, in which the powder of divalent cobalt compound, for example, CoO powder is contained in an active substance mixture, as a positive electrode.

Method for activating an alkaline rechargeable battery

There is provided a nickel electrode for an alkaline secondary battery, in which the coefficient of use of nickel hydroxide, which is an active substance, is high, the swell restricting effect is high, and the charging/discharging cycle life characteristic is high. The nickel electrode is formed by filling a conductive, porous substance of a three-dimensional network structure with a mixture containing an active substance consisting mainly of nickel hydroxide. The nickel hydroxide is such that, when thermogravimetric analysis is performed at a heating rate of 10.degree. C./min and the TG curve is plotted, the value obtained by subtracting the weight decrease percentage at a temperature of T.degree.C. at which the DTG curve, the differential curve of the TG curve, turns to an upward curve from the weight decrease percentage of the nickel hydroxide at a temperature of 100.degree. C. is 0.6 to 1.5%.

Growing community of inventors

Iwaki, Japan

Hidetoshi Abe