Capacity recovery effect in lithium sulphur batteries for electric vehicles

Lithium sulphur batteries have a promisingly high theoretical specific energy density of about 2600 Wh/kg and an expected practical specific energy density of about 500-600 Wh/kg. Therefore, it is a highly promising future energy storage technology for electric vehicles. Beside these advantages, this technology shows a low cell capacity at high discharge currents. Due to the capacity recovery effect up to 20%of the total cell capacity become available again with some rest time. This study shows a newly developed capacity recovery model for lithium sulphur batteries. Due to long rest periods of electric vehicles, this effect has important influence on the usable cell capacity and depth of discharge in lithium sulphur batteries.