Accession Number:

AD0861898

Title:

Improved Cathode Systems for High-Energy Primary Batteries.

Descriptive Note:

Final rept. 1 Jul 68-30 Jun 69,

Corporate Author:

ATOMICS INTERNATIONAL CANOGA PARK CA

Personal Author(s):

Report Date:

1969-10-15

Pagination or Media Count:

53.0

Abstract:

The improvement of cathode performance in primary organic electrolyte batteries by conversion of the active material to an electronic semiconductor was investigated in this program. A series of n-type cadmium fluoride single crystals was prepared by a two-stage high-temperature doping process. Initial efforts to prepare n-type manganous fluoride by analogous procedures did not yield a conductive material. The cadmium fluoride crystals were characterized by the measurement of bulk and contact resistivities, using indium amalgam contacts. The crystal specimens were then examined electrochemically by cathodic discharge at constant current density in a lithium perchlorate - propylene carbonate electrolyte. An electronic mechanism for the discharge of n-type cadmium fluoride was confirmed by the observation of cadmium deposition at the semiconductorelectrolyte interface. An undoped crystal was inactive when examined in the same electrode configuration. Two problems were encountered in the use of semiconducting cadmium fluoride as a cathode material 1 passivation of the crystal surface, and 2 a requirement for careful preparation of the contact between the semiconductor and the external circuit. Recommendations for future work include investigation of the passivation process and means for its control, comparison of reaction rates for electronic and other discharge mechanisms, and continued efforts to prepare semiconducting transition metal halides. Author

Subject Categories:

  • Electrical and Electronic Equipment
  • Electrochemical Energy Storage
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE