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A sodium–sulfur battery is a type of molten-salt battery constructed from liquid sodium and sulfur. This type of battery has a high energy density , high efficiency of charge/discharge and long cycle life , and is fabricated from inexpensive and non-toxic materials. The operating temperatures of 300 to 350 °C and the highly corrosive nature of the sodium polysulfides, primarily make them suitable for stationary energy storage applications. The cell becomes more economical with increasing size. Commercially available cells are typically large with high capacities. This is because larger cells cool down at a slower rate than smaller cells, making it possible to maintain the high operating temperatures.
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