Nitrogen and Sulfur Doped Carbon Cloth as Current Collector and Polysulfide Immobilizer for Magnesium-Sulfur Batteries

AbstractThe combination of Mg and S is considered as an attractive candidate for metal‐sulfur batteries due to their high volumetric energy density and adequate existence of natural resources. However, Mg−S batteries suffer from polysulfide dissolution and shuttling which leads to reduced cycle life and stability. Here we report the significance of the chemical interaction between magnesium polysulfide and N, S dual‐doped carbon cloth for improving the cycle life. Compared to undoped carbon cloth, the dual‐doped carbon cloth as current collector shows improved electrochemical performance. When the dual‐doped carbon cloth as current collector is used in Mg−S cell, it retains the capacity up to 388 mAhg−1 after 40 cycles. The mechanisms of Mg−S battery and chemical interaction of polysulfides with dopant are investigated using X‐ray photoelectron spectroscopy technique. The report clearly directs a new way to improve the performance of Mg−S battery using a modified current collector.