Relationship between compacting pressure, green density, and green strength of powder compacts sued in thermal batteries

摘要

Compressibility behaviour was studied for powders used in thermal batteries, including a cathode using iron disulphide, an electrolyte made of LiCI-KCI eutectic and an anode using a lithium alloy. It appeared that two models (Kawakita and Halldinet al.) are suitable in explaining the densification process. Furthermore, the use of both models is necessary to qualitatively and quantitatively characterize the compression events in the entire pressure range studied (0-800 MPa). In a second part ofthe study, the mechanical properties of the compacts were considered; the experimental results indicated a linear increase of green strength with compacting pressure. Green strength characterization was carried out using three mathematical models(Duckworth, Halldin et al., and German). All of them predicted a green strength increase with increasing density. Finally, the green strength of the powders was found to be sensitive to the size of the interparticle contact area.