Sodium-sulfur battery energy storage container installation

What is a sodium sulfur battery?

Sodium sulfur batteries produced by NGK Insulators Ltd. offer an established, large-scale energy storage technology with the possibility for installation virtually anywhere. With a wide array of advanced features, from large capacity to compactness, NAS battery is a welcome addition into the long-duration energy storage industry.

How long does a sodium sulfur battery last?

Lifetime is claimed to be 15 year or 4500 cycles and the efficiency is around 85%. Sodium sulfur batteries have one of the fastest response times, with a startup speed of 1 ms. The sodium sulfur battery has a high energy density and long cycle life. There are programmes underway to develop lower temperature sodium sulfur batteries.

Who makes sodium sulfur batteries?

Utility-scale sodium–sulfur batteries are manufactured by only one company, NGK Insulators Limited (Nagoya, Japan), which currently has an annual production capacity of 90 MW . The sodium sulfur battery is a high-temperature battery. It operates at 300°C and utilizes a solid electrolyte, making it unique among the common secondary cells.

What temperature should sodium sulfur batteries be kept at?

However, sodium–sulfur batteries have to be kept at high temperatures above 300 °C to keep the reactants liquid, which entails additional effort for heating and thermal insulation, while relatively low round-trip efficiency and further safety concerns over its explosiveness have constrained its wide-scale implementation.