Abstract
The advanced thermal batteries with CoS2 cathode are applied to provide high energy, delivering lower specific power, because it is not suitable for high current discharge. NiCl2, possessing a high potential and large current discharge capacity, is considered as one of the cathode candidates for high power thermal battery. LiB/NiCl2 couple outputs effectively specific power of ∼17.3kWkg−1 in this work at 500°C and 0.5Acm−2 (8Ag−1). However, NiCl2 has highly dissolution in LiF-LiCl-LiBr electrolyte (widely used in thermal batteries), resulting in the capacity loss and severe safety problem. Here, cross-sections between NiCl2 cathode and LiF-LiCl-LiBr electrolyte have been characterised by SEM after discharge at 500°C, and 0.5Acm−2-discharged interface exhibits blurrier boundary than that of 0.2Acm−2-discharged.
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