| 摘要 |
PURPOSE:To maintain high energy efficiency by using activated carbon fibers whose iodine absorption is 1800-3000mg/g as the active layer of a carbon plastic electrode. CONSTITUTION:In a metal halogen battery, its electrochemical reaction is accelerated with increase in iodine absorption in an active layer. The relation of the discharge overvoltage of a positive electrode to the iodine absorption is not linear function, and the overvoltage is very high below some level (1800mg/g) of the absorption. The absorption is saturated above a certain level (3000mg/g), and the relation of overvoltage to the absorption shows exponential function. By using activated carbon fibers whose iodine absorption is 1800-3000mg/g, preferably 2000-2500mg/g as the active layer of an electrode, the voltage efficiency, coulomb efficiency, and energy efficiency of a battery is stabilized. |
