Single‐atomic tungsten‐doped Co ₃ O ₄ nanosheets for enhanced electrochemical kinetics in lithium–sulfur batteries

The practical application of lithium–sulfur batteries (LSBs) is severely hindered by the undesirable shuttling lithium polysulfides (LiPSs) and sluggish redox kinetics sulfur species. Herein, a series ultrathin single-atomic tungsten-doped Co3O4 (Wx-Co3O4) nanosheets as catalytic additives in cathode for LSBs are rationally designed synthesized. Benefiting from enhanced activity optimized electronic structure W doping, Wx-Co3O4 not only reduces LiPSs but also decreases energy barrier reactions species, leading to accelerated electrode kinetic. As result, LSB cathodes with use 5.0 wt% W0.02-Co3O4 electrocatalyst show high reversible capacities 1217.0 558.6 mAh g−1 at 0.2 C, respectively, maintain capacity 644.6 1.0 C (1.0 = 1675 mA g−1) after 500 cycles. With loading 5.5 mg cm−2 electrolyte–electrode ratio 8 μLelectrolyte mgsulfur−1, W0.02-Co3O4-based retains areal 3.86 0.1 50 cycles an initial retention 84.7%.