OXIS Energy, the well-known lithium-sulfur (Li-S) battery cell developer from the UK, announced this week that is close to achieving an energy density of 500 Wh/kg.

The company said that it has successfully tested its cell prototypes at 471 Wh/kg, and is confident in achieving 500 Wh/kg within 12 months.

Currently, OXIS Energy supplies its customers from Europe, the USA and Japan (on a relatively low scale we guess) with battery cells rated at 400 Wh/kg. The main general problem with Li-S over the years was their low life cycle.

"Consistently shipping cells at 400Wh/kg to its clients in Europe, the USA and Japan, OXIS is collaborating with major European chemical partners to develop an advanced lithium metal protection mechanism to ensure a significant improvement in the Lithium Sulfur (Li-S) life cycle."