Advanced Calcium-Thionyl Chloride High-Power Battery
Abstract
Recently we have made a breakthrough in the development of two advanced Ca-TC systems which have much better electric storage properties than the state-of-the-art Ca-SOC 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. In this phase we improved significantly the cell performance. An improved C-size A7 type cell delivers 4.4 Ah at 0.9 A rate and room temperature which is 50% more than similar size commercial lithium cells have. The SAFT LSH14 lithium-thionyl chloride and the Duracell L028SH lithium-SO2 cells have at this rate only 2.9 and 2.7 Ah respectively. During one year of storage at room temperature the heat generation rate of 150 cm2 C-size A7 type cells decreased to a level of 60-70 microwatts. A cell lost 0.3 Ah after this storage period. The effect of several parameters on the corrosion rate of calcium in TC solutions was studied. Preliminary results indicate: SO2 decreases corrosion, there is no stress corrosion due to twisting of Ca foils, the native oxide layer helps in preventing corrosion, Ca foils as received contain only about 90% metallic calcium. The role native calcium oxide layer plays depends on the type of electrolyte used. Keywords: Calcium thionyl chloride battery; Performance; Shelf life; Corrosion of calcium; Characteristics of passive layers; High energy density battery. SEI; Calorimetry.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 15, 1989
- Accession Number
- ADA211856
Entities
People
- E. Peled