Medium‐temperature liquid sodium (ZEBRA) battery cells, employing solid transition metal dichloride cathodes, are under active development. This paper details key aspects of the development of a Ni,
NiCl2
positive electrode, operating in
NaAlCl4
molten salt electrolyte. Cells using these materials have achieved a high degree of reversibility and long cell life (>2000 cycles) and operate over the temperature range 200°–350°C. The cell has an open‐circuit voltage of 2.58V at 300°C and is an attractive contender for use in high‐energy and power density advanced batteries. Mention is made to the related Fe‐based electrode.
ChemInform Abstract A medium-temp. liquid sodium (ZEBRA) cell with a porous Ni,NiCl2 cathode that operates in a NaAlCl4 molten salt electrolyte is described and its electrochemical performance is studied in detail. Additions of sulfur to the NaAlCl4 electrolyte results in the development of a modified, high surface area, active metallic phase which is stable on charge/discharge cycling for many hundreds of cycles. The cells exhibit a high degree of reversibility and long cell life (> 2000 cycles) and operate in the temp. range 200-350 rc C. The cell has an open-circuit voltage of 2.58 V at 300 rc C and is an attractive candidate for use in high-energy and power density advanced batteries.
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