MOF-Enhanced Sulfur-Containing Polymer for Boosting Lithium-Ion Diffusion in Lithium-Sulfur Battery

Organic sulfur batteries, with their high theoretical specific capacity and energy density, have emerged as promising candidates. However, their application is hindered by challenges in lithium-ion diffusion within dense molecular structures, particularly in polymers with high sulfur content. In this study, we report the synthesis of a novel MOF-based sulfur-containing polymer, MOF808-D@PS, designed to enhance lithium-ion diffusion and optimize electrochemical performance. The introduction of N-containing organic ligands within the MOF architecture led to a 103-fold increase in the lithium-ion diffusion coefficient compared to unmodified sulfur-containing polymer cathodes. The MOF808-D@PS electrode, with a sulfur content of 69.4%, exhibited exceptional electrochemical performance, achieving a capacity of 1213 mAh g-1 at 0.3 C. Even at high rate of 5 C, the material retained a significant capacity of 726 mAh g-1. These results demonstrate the potential of MOF-based strategies in advancing the design of high-rate sulfur-containing polymer electrodes, providing a pathway toward the commercial viability of lithium-sulfur (Li-S) batteries.