Advanced Calcium Thionyl Chloride High Power Battery
Abstract
We have made a breakthrough in the development of two advanced calcium thionyl chloride systems which have much better storage properties than the state-of-the-art Ca-SOC12 cell. This has been done by replacing the CaX2 (X=A1C14) electrolyte by SrX2 (type A), or BaX2 (type B). The project's goals are to gain a better understanding of the electrochemistry of the advanced systems and to establish their safety and performance. We present results regarding the properties of MX2-sulfur dioxide-TC solutions (M = calcium, strontium, barium), including Raman spectra, viscosity, and conductivity data. We explain the effect of SO2 and temperature on the conductivity and conduction mechanism. We studied the effect of 70 C storage on performance of the baseline (C-size) cell. A fresh cell delivered, at room temperature, 3.4 Ah and 3.2 Ah on 10 and 4 ohm load respectively. It lost 20% and 55% or more capacity after two and four weeks of storage at 70 C, much more than type A cell. Short circuit, heavy load and reversal tests of type A cells ended with no cell venting or leaking. Ampule corrosion tests of calcium foils in type A electrolyte reveal 0. 5-3% corrosion after four weeks of storage at 70 C. This indicates that a room temperature shelf life of more than ten years is feasible for type A system. Keywords: Electric batteries.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 25, 1988
- Accession Number
- ADA199035
Entities
People
- Emanuel Peled