On the cationic nature of lithium polysulfide in lithium–sulfur batteries

Zhang's group from Tsinghua University provided reliable experimental and theoretical evidence on the existence of cationic LiPSs, which were confirmed to be unfavorable for the cathode redox kinetics and rather reactive towards the Li metal anode. Accordingly, the energy density of Li – S batteries can be enhanced by decreasing the Li salt concentration to suppress the formation of cationic LiPSs.