| 摘要 |
PURPOSE:To improve the energy efficiency of battery by setting higher the fiber filling ratio to the outer layer of a cathode conductive layer, while by setting lower those of the inner and outer layers. CONSTITUTION:A cathode conductive material M formed with carbon filter of mat and cylinder shape is formed of three layers, i.e. an outer cathode conductive layer Ma abutting against the inner face of a cathode vessel 2, an inner cathode conductive layer Mb abutting against the outer peripheral face of a solid electrolytic tube 5, and an intermediate cathode conductive layer Mc positioned between both layers. The carbon fiber filling ratio to the layer Ma is sufficiently set higher, for example 80% or more, while the ratios to the layers Mb, Mc lower, for example 30%. Since the filling ratio to the layer Ma is set high, even if the liquid surface S of a cathode active material (sulfur) is lowered downward in the layers Mb and Mc at the time of changing of battery, the whole inner peripheral face of the vessel 2 is immersed with sulfur as shown by dotted lines by the soaking up retaining action due to the capillary phenomenon, the lowering of electric resistance is restrained while the passing area of the vessel 2 is sufficiently ensured, and the flow of current is smoothened, thereby the energy efficiency of battery can be increased. |
