Abstract: Suitable as active cathode material for an electrochemical lithium secondary cell are oxygen-deficient spinels Li1+xMn2−xO4−&dgr; , where 0≦x≦0.33 and 0.01≦&dgr;≦0.5. Their region of existence in a phase diagram laid out between the corner points MnO, MnO2 and Li2MnO3 for lithium manganese oxide compounds is defined by the corner compounds LiMn2O4, Li2Mn4O7, Li8Mn10O21 and Li4/3Mn5/3O4, all the compounds along the lines LiMn2O4—Li4/3Mn5/3O4 and LiMn2O4—Li2Mn2O4 being excepted. The spinels are produced by a modified ceramic process from a mixture of Li-containing and Mn-containing starting substances whose reaction product is reduced by roasting in an Ar/H2 atmosphere. The Li components x can be replaced partially or completely by foreign monovalent or multivalent cations from the series consisting of Co, Mg, Zn, Ni, Ca, Bi, Ti, V, Rh or Cu.

Abstract: The invention relates to a laminated lithium-ion cell which comprises flexible layers, wherein the negative electrode is lithium metal, lithium alloy or a metallic bonded fiber web or a foam, which comprises a lithium-intercalating material such as carbon, graphite, tungsten dioxide, molybdenum dioxide, titanium dioxide, titanium disulfide or vanadium pentoxide as the active component, the separator is made of a porous polymer in which a non-aqueous electrolyte is immobilized, and the positive electrode as the active material comprises lithiated manganese dioxide, manganese spinel, lithium-metal oxides, lithium-metal mixed oxides or lithium-metal sulfides.

Abstract: Nontoxic, chemically stable lithium tris(fluorosulphonyl)methanide, LiC(SO.sub.2 F).sub.3, is used as a conducting salt for rechargeable lithium cells containing nonaqueous electrolytes based on esters or polymeric electrolytes such as polyethylene oxide. The cell electrolyte is preferably comprised of an approximately 1 molar solution of the salt in a mixture of 50% by volume of ethylene carbonate (EC) and 50% by volume of diethyl carbonate (DEC).