Speaker
Description
Sodium-nickel chloride batteries are a highly efficient and intrinsically safe energy storage technology. [The research activities at the Fraunhofer IKTS address the comprehensive investigation of all related materials, components, and processes. This covers the electrochemical cell behavior described with the given equation.
Ni + 2 NaCl ⇌ NiCl2 + 2 Na E0=2.58 V at 300 °C
The cathode material consisting of nickel, sodium chloride, and some additives is crucial for the later full-cell performance. In general, sodium-nickel chloride batteries use a high amount of nickel to provide excellent electrical conductivity. To exchange and save the costly and critical nickel, carbon materials were coated with a small layer of nickel to substitute the over-stoichiometric amount of nickel at sufficient electrical conductivity.
The nickel-coated carbon materials were prepared by dry compaction to granules. The feasibility study showed that the high compaction force does not destroy the nickel surface. The electrochemical test reached a specific capacity of up to 180 mAh*g-1 at a nickel reduction of up to 36 %. These are promising results for further development in the field of sodium-nickel chloride batteries.
References
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| Keywords | Sodium-nickel chloride batteries, nickel coated carbon core-shell |
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