NiCl2 Cathode with the High Load Capacity for High Specific Power Thermal Battery

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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