Abstract
Thermal batteries are adopted as the power sources for devices, due to the high power density and long life for storage. So far, disulfides, such as FeS2, CoS2, Fe1-xCoxS2 (0<x<1) are selected as the best cathodes. But limitations are existed, for example, FeS2 is low conductive, and CoS2 exhibits poor environmental stability. Therefore, structure modifications are used to improve the properties. We have done lots of work on constructing the materials with core-shell structure, such as CoS2@FeS2, C@CoS2, FeS2@CoS2, for conductivity, stability and wetting improvement. The results show that performance enhancements of thermal batteries are achieved, with proper adjustment of the composition and thickness of the shell layer. Fig. 1 illustrates the discharge curves of CoS2, with surface covered by the molten salt adsorbent, which is used to enhance the wettability of molten salt on CoS2. The discharge capacity of CoS2 is increased from ~310 mAh/g to ~380 mAh/g, with a current of 200 mA cm-2 at 525 °C, by surface reconstruction. Figure 1
Published Version
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