TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Material: The glass fiber is a boro-silicate glass or a quartz glass.    TECHNOLOGY FOCUS - METALLURGY - Preferred Material: The lithium-aluminum-manganese alloy is an alloy manufactured by electrochemical insertion of lithium into an aluminum-manganese alloy. Preferred Composition: The manganese content in the lithium-aluminum-manganese alloy is 0.1-10 wt.%.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The lithium perfluoroalkylsulfonyl imide is contained in the non-aqueous electrolyte as the solute.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The solvent comprises polyethylene glycol dialkyl ether. EXAMPLE - Lithium manganese oxide powder having a spinel structure, carbon black powder as a conductive agent and a fluororesin powder as a binding agent were mixed in a ratio by weight of 85:10:5 to prepare a positive electrode mixture. The mixture was fabricated into a disc by foundry molding, and was dried at 250degreesC for 2 hours under vacuum to prepare a positive electrode. Lithium film in an amount which provided a lithium concentration of 15 mol% relative to aluminum was put on an aluminum-manganese alloy plate, and the plate was dipped in non-aqueous electrolyte prepared below to occlude lithium electrochemically in the aluminum-manganese alloy and to prepare a lithium-aluminum-manganese alloy. The lithium-aluminum-manganese alloy was punched out into a disc to prepare a negative electrode. Lithium bis(trifluoromethylsulfonyl)imide as a solute was dissolved in, as a non-aqueous solvent, diethylene glycol dimethyl ether to a concentration of 1 mol/L to prepare a non-aqueous electrolyte. A non-woven fabric of boro-silicate glass fibers was used as a separator. The separator was impregnated with the non-aqueous electrolyte. The separator was placed between the negative electrode and positive electrode and was placed in a battery case comprising positive electrode can (5) and negative electrode can (4). The positive electrode was connected to the positive electrode can through the positive electrode current collector (7). The negative electrode was connected to the negative electrode can through the negative electrode current collector (6). Chemical energy generated in the battery can be taken outside as electrical energy through terminals of the positive can and the negative can.