GB1427602A - Primary cell - Google Patents

Abstract

1427602 Primary cell VARTA BATTERIE AG 21 May 1973 [24 May 1972] 24159/73 Heading H1B [Also in Division C7] In a primary cell including a negative magnesium electrode, a positive manganese dioxide depolarizer electrode mass and an aqueous electrolyte which contains magnesium perchlorate in a concentration range of 2N-3N, there is at least 0À4 part by weight of water per part by weight of manganese dioxide. The electrolyte may have a small amount of an inhibitor, e.g. lithium chromate, added. In an example the concentration of magnesium perchlorate in the electrolyte is from 24 to 27À5% by weight. The total electrolyte in the cell may be included in the depolarizer mix, which may have the following composition in per cent by weight:- 57% manganese dioxide, 6% carbon black, 34À5% aqueous magnesium perchloride electrolyte, 2% barium chromate and 0À5% magnesium oxide. The negative magnesium electrode may also contain 1À6- 2À5% Al, less than 0À15% Mn, 0À8-1À6% Zn, less than 0À005% Fe, less than 0À05% Cu, less than 0À05% Si, less than 0À003% Ni, 0À1-0À25% Ca and less than 0À3% of other impurities.