In metal--air batteries a conventional but improved metal electrode is combined with an alternately operating oxygen electrode. Iron electrodes with amalgamated expanded copper support were subjected to long time tests over 500 total discharging cycles with a load of 40 mA/cm exp 2 . No losses in electrode potential or in capacity were observed. The conversion of the active mass corresponds to approximately 50%. The oxygen electrode is composed of three layers: a hydrophilic cover layer for the O sub 2 evolution, a hydrophobic carbon layer for the O sub 2 reduction, and a porous PTFE sheet. The carbon is activated with doped silver. Service times of 500 cycles with an alternating cathodic and anodic load of 40 mA/cm exp 2 in a 6 hours rhythm are reproducibly achieved. A specific power of 20 W/kg and a specific energy of 60 Wh/kg can be derived for the system from experimental values of a 70-W battery. For this battery consisting of 10 cells a voltage decay of 1 volt did not occur before 140 cycles. From experimental results and calculations it follows that a hybrid system consisting of an iron--air and a lead--acid battery increases the range of action for an electric vehicle twice in comparison with the lead--acid accumulator of the same weight. 218 figures, 82 references.

  • Supplemental Notes:
    • U.S. Sales Only.
  • Corporate Authors:

    Siemens Aktiengesellschaft

    Postfach 3240
    8520 Erlangen,   Germany 
  • Authors:
    • Cnobloch, H
    • Drabek, V
    • Groeppel, D
    • Kuehl, D
    • Nippe, W
  • Publication Date: 1976-12

Media Info

  • Pagination: 344 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00198431
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Files: TRIS
  • Created Date: Oct 17 1980 12:00AM