Hitachi, Ltd.

Other

Akihiro Gotoh

Tatsuo Horiba

Katsunori Nishimura

Hidetoshi Honbo

Mamoru Mizumoto

Takeshi Miyazaki

Kunihiro Maeda

Yokuo Saitoh

Shinsuke Higuchi

Masahiro Kasai

Kyoko Honbo

Yoshiji Hotta

Noriaki Okamoto

Yasushi Muranaka

Kousaku Wakatsuki

Toyoji Okuwaki

A lithium secondary battery characterized by a high power capacity and a long service life has a negative electrode , a positive electrode and a non-aqueous electrolyte containing lithium salt. The lithium secondary battery is characterized by further comprising multiple oxide represented by a general formula Li Mn M Q O (where M denotes at least one element selected from among Ni, Fe, Co, Cu and Cr; Q denotes at least one element selected from among C, N, S, P, Si, F, Cl, I and Br; and x, a, b, c and d are within the range of 0&lE;x&lE;) 1.1, 0&lE;a&lE;0.5, 0.05&lE;b&lE;1.0, 0.000001&lE;c<0.05 and 0&lE;d&lE;0.1, respectively) as a positive electrode activator.

Positive electrode activator for lithium secondary battery and lithium secondary battery

A lithium secondary battery having a longer life than conventional battery at a high temperature for electric power storage and electric vehicles is obtained. A lithium secondary battery having a long life at a high temperature can be obtained by using a material specified in Li/Mn atomic ratio, lattice constant, half value width, specific surface area, and average primary particle size as the positive electrode active material; and a material specified in density.

Lithium secondary battery

A treating fluid is in contact with a negative electrode containing lithium of a lithium cell under a first condition to react a surface portion of the negative electrode, and a treating fluid is in contact with lithium existing inside an article formed on the surface of the above-described negative electrode under a second condition. The cells can be effectively treated under safety condition to collect either the valuable substances, or the cell constructive components.

Lithium cell treating apparatus

Lithium cell treating method

A safe and controllable method of treating a secondary battery having at least one component containing alkali metal, comprises the steps of opening the battery casing, and introducing a gas containing at least one of water vapor and alcohol vapor into a closed chamber containing the battery thereby to form alkali metal hydroxide. To control hydrogen concentration, the rate of introduction of water and/or alcohol vapor may be varied. Apparatus for carrying out this method is also described.

Apparatus for treatment of a battery containing alkali metal

Lithium cell treating method and lithium cell treating apparatus

Method and apparatus for treatment of a battery containing alkali metal

The present invention provides a magnetic disc file which comprises a thin film magnetic disc for recording information, a motor for rotating the thin film magnetic disc, a magnetic head for writing and reading information, the head being provided with a flying slider, and a carriage for supporting the magnetic head and changing the position of the head in respect of the thin film magnetic disc, the flying height of the flying slider from the thin film magnetic disc being set in the range of 0.05 to 0.15 .mu.m, and the slider being not in contact with the thin film magnetic disc during the seeking operation on the thin film magnetic disc, the slider being a sintered body containing a metal oxide or oxides in an amount of 50 vol % or more based on the total of said body and containing 0.01 wt % to 2 wt % of fluorine based on the total of the body; a thin film magnetic head which comprises a flying slider of the same sintered body as mentioned above, and a head element formed on the surface of the slider; and a wafer for making thin film magnetic heads, which comprises the same sintered body as mentioned above.

Magnetic disc file including a slider which exhibits reduced deformation

The present invention provides; a magnetic disk recorder comprising (i) magnetic disks having magnetic recording media, (ii) thin-film magnetic heads for recording information in the recording media and reproducing information therefrom, and (iii) a carriage for moving the magnetic heads to intended positions, the recorder being wherein the thin-film magnetic heads are formed on sliders and these sliders comprise sintered bodies containing a non-magnetic metal oxide of spinel structure and harder ceramic particles than the metal oxide which are dispersed in the metal oxide; a sintered body useful particularly as a material for the magnetic head slider, a method for making the sintered body, and a magnetic head and a magnetic head slider, for recording and reproducing information, which are made by using the sintered body.

Magnetic recorder provided with a magnetic head slider having a

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Hitachi, Japan

Akihiro Gotoh