JP2558519B

PURPOSE:To improve the charge and discharge characteristics of a lithium organic secondary battery by using a negative electrode made by superimposing a Li plate and a hardened Al or Al alloy plate upon each other and then electrochemically alloying these plates together in the presence of a liquid electrolyte. CONSTITUTION:Performing hardening such as work hardening or aging hardening on an Al plate or an Al alloy plate results in increased intergranulation or dislocation in the plate. The presence of increased intergranulation or dislocation in the plate facilitates either electrochemical alloying of Li with Al or an Al alloy or dispersion of Li into Al crystals to increase the amount and speed of alloying thereby resulting in improved charge-and-discharge characteristics of the battery. Therefore, the negative electrode 3 of the lithium organic secondary battery of this invention is made by superimposing a Li plate 3a and a hardened Al or Al alloy plate 3b upon each other and then bringing these plates 3a and 3b into contact with a liquid electrolyte to alloy the plates 3a and 3b together. If the Li content of the plate 3a is at least about 48atom%, the plates 3a and 3b are alloyed together into a unified plate. But, if the Li content of the plate 3a is at most about 48atom%, the plates 3a and 3b are alloyed together to form a Li-Al alloy layer and an Al layer.