PURPOSE: To improve stability and energy efficiency in an Na/X battery by preventing Na electrode resistance from increasing or preventing recharge from becoming impossible through the whole battery charge/discharge period.
CONSTITUTION: An Na/X battery is constituted in such a way that a negative electrode active material 7 using Na as its essential component is housed in a negative electrode container 4, and a positive electrode active material 5 using NaCl, FeCl, Se, bivalent S or quadrivalent S and so on as its essential component is housed in a positive electrode container 3, and a solid electrolyte tube 1 which only an Na ion can pass through is arranged between the negative electrode active material 7 and the positive electrode active material 5, and an Na filling tube and current collecting tube 8 arranged as an electric conductor between the negative electrode active material 7 and the negative electrode container 4 is blocked up in its bottom part, and an Na supply hole 16 is formed in the upper part, and Na is filed always in the Na filling and current collecting tube 8.
WATABIKI NAOHISA
NEMOTO KIYOMITSU
KAWASAKI KATSUO
INOUE HISAMICHI
SHIMOYASHIKI SHIGEHIRO
