March 2, 2021

New electrolyte makes lithium-sulfur batteries safe and durable

New electrolyte makes lithium-sulfur batteries safe and durable

Otis Energy has developed a stable and long-lasting lithium-sulfur battery with twice the capacity of existing lithium-ion batteries.

Lithium sulfur batteries have existed since the 1960syears and are well known for their high energy density and low cost. Their main disadvantage is that lithium polysulfides dissolve well in the electrolytes used, which is why the cathode quickly melts.

Researchers at Otis Energy claim to have developed a safe, non-flammable electrolyte that retains metallic lithium for much longer. This extends the battery life to 250 charge / discharge cycles, and within two years, engineers plan to increase this indicator to 500 cycles, which is the average level of modern lithium-ion batteries.

In addition, the team used in theirThe design of the passivating layer is ceramic lithium sulfide, which blocks the flow of electricity preventing overheating, sudden discharge and gradual leakage of energy during downtime.

The created battery has an energy capacity of more than 500 Wh / kg, which is much better than modern commercial lithium-ion batteries.

New electrolyte makes lithium-sulfur batteries safe and durable

Otis Energy has already signed a contract with aviationBye Aerospace, which will use the developed lithium-sulfur batteries in its small electric planes. According to the designers, this will increase the flight range by 50-100%, by reducing the mass of energy stores.

If the joint project is successful, the companies will consider the prospects of electrifying aircraft for regional transportation.

Due to limited lithium reserves, researchersall over the world are searching for effective alternatives from more common elements, and recently in Skoltech have developed high-power potassium batteries, charging in 10 seconds.

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