Gas-pressure studies with Li(Si)/FeS2 thermal batteries
Abstract
The internal gas pressure of thermal batteries can serve as an indicator of proper functioning. In the case of overheated batteries, venting of the gases can occur. Little information is available, however, as to the magnitude of the internal gas pressure under normal operating conditions. A study was undertaken to monitor the internal gas pressure of Li(Si)/FeS2 thermal batteries during discharge via a pressure transducer attached to the battery case. Factors that could influence the pressure were examined and included: temperature, FeS2 particle size, catholyte composition (lithiated vs. unlithiated), catholyte processing (fused vs. unfused), anode composition (flooded vs. unflooded), discharge load, and the presence of Li2O in the separator. Representative gas examples were also taken during discharge for analysis by gas chromatography. The gas pressure was strongly influenced by the migration of electrolyte from the separator into the catholyte and anode during activation and discharge which impacted the gettering of gases by the anode.
- Publication:
-
Proposed for presentation at the 35th International Power Sources Symposium
- Pub Date:
- 1991
- Bibcode:
- 1991ips..symp...22G
- Keywords:
-
- Electrolytes;
- Gas Chromatography;
- Gas Pressure;
- Iron Compounds;
- Lithium;
- Pressure Measurement;
- Silicon;
- Sulfides;
- Thermal Batteries;
- Electrical Properties;
- Particle Size Distribution;
- Temperature Dependence;
- Electronics and Electrical Engineering