| 摘要 |
A water-activated primary battery using magnesium or alloys thereof as the anode and a cathode of various material having a redox potential allowing a charge transfer reaction is described, said battery comprising one or more electrochemical cells enclosed in a casing (1), characterized in that it contains a pH buffer system formed by at least one acid having a ionization constant Ka<=0.1 moles/liter, in order to maintain in the electrolytic solution the concentration of the hydroxyl ions yielded by the reactionMg+2 H2O->Mg2++2 OH-+H2↑below the threshold value that causes the Mg(OH)2 precipitation, said precipitation being also provoked by the increase of the Mg2+ concentration due to the anodic reactionMg->Mg2++2 ethereby avoiding the deposition of Mg (OH)2 on the cathode with the consequent decrease of the voltage output from said battery. |
