A high capacity lithium secondary battery with excellent safety is provided by suppressing expansion of a negative electrode active material during charge and increasing the content of a heat-resistant resin in a separator relative to conventional one. The lithium secondary battery includes: a negative electrode active material that comprises compound particles containing at least one metal element selected from the group consisting of Si, Sn, Al, and Zn; and a separator that has a first porous layer comprising polyolefin and a second porous layer comprising a heat-resistant resin. The separator contains 10 to 60 parts by weight of the second porous layer per 100 parts by weight of the first porous layer.

Lithium Secondary Battery

A nonaqueous electrolyte battery whose electrolyte can be selected from a wider range of materials can be obtained. The nonaqueous electrolyte battery comprises a positive electrode, a negative electrode and a nonaqueous electrolytic solution. At least one of the positive and negative electrodes has a collector which includes a compound containing at least one element selected from the group consisting of transition metal elements, group III elements, group IV Elements, and group V elements.

Nonaqueous electrolyte battery

A subject for the invention is to improve the cycle characteristics of a high-capacity secondary battery containing an active material packed at a high density, by using a particulate active material having a low aspect ratio. The invention relates to a nonaqueous-electrolyte secondary battery comprising a negative electrode and a positive electrode each capable of occluding/releasing lithium, a separator, and a nonaqueous electrolyte solution comprising a nonaqueous solvent and a lithium salt, characterized in that the separator comprises a porous film made of a thermoplastic resin containing an inorganic filler, and at least either of the following is satisfied: the active material contained in the negative electrode is a particulate active material having an aspect ratio of from 1.02 to 3; and the active material contained in the positive electrode is a particulate active material having an aspect ratio of from 1.02 to 2.2.

Nonaqueous electrolyte secondary battery

Provided is a lithium secondary battery that is capable of preventing thermal runaway inside the battery due to a short circuit. Included are cathodes (3) having cathode active material that stores and discharges lithium ions, anodes (4) that store and discharge lithium ions, and a dummy laminated body (9) in which dummy cathodes (6) connected to a cathode terminal and dummy anodes (7) connected to an anode terminal are alternately laminated and that has short circuit separators (8) for insulating the dummy cathodes (6) and the dummy anodes (7); and the dummy laminated body (9) is laminated on the outside of the alternately laminated cathodes (3) and anodes (4).

Lithium secondary battery

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery in which an insulation sheet arranged between an inner surface of a cathode can and an anode current collector made of copper foil arranged to be opposed to the inner surface is made so as not to be peeled off in a nonaqueous electrolyte solution.SOLUTION: A hot-melt adhesive agent of an acrylic system such as an EEA resin or the like is used as an adhesion means between one anode current collector arranged to opposed the cathode can and the insulation sheet.

PROBLEM TO BE SOLVED: To provide a flat nonaqueous electrolyte secondary battery attempting reduction of defects in manufacturing batteries due to loose electrodes and improved battery performance. SOLUTION: The flat nonaqueous electrolyte secondary battery comprises a sealed structure having a negative electrode metal case and a positive electrode metal case which are caulked through an insulating gasket. The structure contains a group of electrodes made by wounding a positive electrode, a negative electrode and a separator, and a nonaqueous electrolyte. A positive electrode component and a negative electrode component, having conductivity respectively to one or the other of the outer surfaces of the electrodes in the direction parallel to the flat surface of the flat battery, are exposed and connected either to the positive electrode case or a battery case. The leading end parts of the outer periphery of the positive electrode and the negative electrode in the group of electrodes formed by wounding sheet electrode units, a separator positioned at the inner surface thereof, and the other electrode positioned at the inner surface of the separator are respectively individually stopped winding at both of the two side R parts of the group of electrodes. This structure prevents the electrodes from loosening and shifting, improves the battery performance and can prevent a short circuit between the group of electrodes and the battery case. COPYRIGHT: (C)2002,JPO

Flat nonaqueous electrolyte secondary battery

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Flat nonaqueous electrolyte secondary battery