Nonaqueous secondary battery with lithium titanium cathode
AssigneeHitachi Maxell, Ltd.
InventorsShinji Yamasaki, Takatomo Nishino, Akira Asada
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Abstract
A method for manufacturing a lithium secondary cell comprising a positive electrode containing a lithium titanate as an active material, a negative electrode containing a carbonaceous material as an active material, and an electrolytic solution comprising a solution of a lithium salt in an organic solvent. The lithium titanate preferably has a composition of the formula: LixTiyO4 (0.8≦x≦1.4 and 1.6≦y≦2.2). The lithium secondary cell has a high capacity suitable for use as a power source for a wristwatch and good charge-discharge properties, at a nominal voltage of 1.5 V.
Claims18
A method of manufacturing a lithium secondary cell which comprises:
- assembling a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, in an electrolytic solution, the positive electrode containing lithium titanate as an active material, the negative electrode containing carbonaceous material as an active material, and the electrolytic solution comprising a lithium salt in an organic solvent;
- doping lithium ions into the negative electrode, wherein the doping is performed by placing metallic lithium in the cell in an amount corresponding to about 80% of an electric capacity of the positive electrode;
- and
- sealing the positive electrode, the negative electrode, the separator and the electrolytic solution in a space formed by a positive electrode can, a negative electrode can and an insulation packing.
Dependencies are inferred from the claim text.