Anion-doped polypyrrole three-dimensional framework enables adsorption and conversion in lithium–sulfur batteries

Inhibiting the shuttle effect and propelling polysulfide conversion by introducing a suitable sulfur container has been proven as a promising strategy to enhance the cycle life of lithium-sulfur (Li–S) batteries. Here, a unique three-dimensional (3D) inter-connected framework assembled with SO 4 2− -doped polypyrrole (PPy-SO 4 ) nanowires is proposed. The doping SO 4 2− anion in a polymer skeleton could confine lithium polysulfides (LiPSs) by polar-polar interaction to inhibit the shuttle effect and enhance the conductivity of PPy to accelerate polysulfide conversion. Moreover, the electrostatic coupling between SO 4 2− anion and Li + , as well as between –N + – and S n 2− , at polypyrrole /electrolyte interface can effectively regulate the redox kinetics of polysulfide. Besides, the inter-connected framework creates a large contact surface for sulfur and high-flux paths for electron transport. Consequently, the Li–S batteries assembled with PPy-SO 4 /S cathode exhibit a stable capacity of 501 mAh g −1 after 350 cycles at 1C, showing a low decay rate of 0.09% per cycle. Notably, the efficiency of the anion doping strategy is further verified in the pouch cell, realizing a capacity of 480 mAh g −1 after 250 cycles. This work illustrates that anion doping with rational structural design is a feasible solution to boost the electrochemical performance of Li–S batteries.