Abstract
The polymer binder, poly(imide-co-siloxane) (PIS), was synthesized and applied to form a thin cathode layer of composites for a thermal battery that has an unusually high operating temperature of 450 °C. The PIS was prepared through cross-linking of the polyimide with polysiloxane. The morphology of FeS2/PIS composites showed that FeS2 particles was coated with the PIS cross-linked gel. The FeS2/PIS composites enabled to fabricate mechanically stable thin cathode layer that was 10–20% of the thickness of a conventional pellet-type cathode. The FeS2/PIS composites were stable up to 400 °C and maintained their morphology at this temperature. PIS coating layers decomposed at 450 °C, and a new residue was generated, which was observed by transmission electron microscopy, and the compositional change was analyzed. The FeS2/PIS composites showed enhanced thermal stability over that of FeS2 in thermogravimetric analysis. The thermal battery with the PIS polymer binder showed a 20% discharge capacity increase when compared to a conventional pellet-type cathode.
Highlights
Much attention has been drawn to the functional materials for energy storage devices that are suitable for improving performance and efficient manufacturing processes [1,2]
We show that a thin cathode film with mechanical stability can be formed with the PIS binder
PIS was formed by cross-linking polyimide and polysiloxane at high temperatures
Summary
Much attention has been drawn to the functional materials for energy storage devices that are suitable for improving performance and efficient manufacturing processes [1,2]. Among the various energy storage devices, thermal batteries have had little progress in their applied materials over the long history of development due to their high operating temperature up to 450 ◦ C. Thermal batteries are primarily used for emergency power sources and military purposes (for example, missiles, ordnances, and nuclear weapons) due to their exceptional mechanical robustness, reliability, and long shelf life [4,5,6,7,8]. Optimization of the molding and manufacturing process of the individual components of thermal batteries is very important because the mechanical strength and reliability of thermal batteries are critical for emergency and military applications [9]
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