Rechargeable Li-S Battery with Specific Energy 350 Wh/kg and Specific Power 3000 W/kg.

Abstract

Rate capability improvements of Li-S cells are reported. The main goal of this work, to achieve the maximum high power benefit from the liquid polysulfide cathode system, was realized. Higher rate capability has been achieved through reduction of the electrode stack Area Specific Resistance (ASR) to below 10 Ohm*cm2, contact design improvements, and better current distribution uniformity along the electrodes and current collectors. Maximal specific power delivered by 2.5 Ah cells at 30 A pulses was 3500 W/kg. At a continuous discharge, with specific power at ~1500 W/kg, the 2.5 Ah cells delivered specific energy in excess of 200 Wh/kg.