Sodiumsulphur batteries

The sodium-sulphur battery is a high-temperature battery. It operates at 300°C and contains liquid sodium which will explode if allowed in contact with water. Safety is a major issue with these batteries. However the battery has a very-high-energy density which makes it attractive, particularly for automotive applications.

The battery is being developed for utility applications in Japan. Demonstration and early commercial projects have ranged in size from 500 kW to 6 MW. Most are in Japan but a small unit was commissioned in the USA in 2002.

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