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Sulfur-Rich Molybdenum Sulfide as a Cathode Material for Room Temperature Sodium–Sulfur Batteries

The low cost, abundance,
and high capacity of sodium and sulfur
make them attractive battery materials. However, formation and migration
of polysulfides in sulfur batteries causes rapid capacity fade, limiting
battery cycle life. Most strategies to mitigate polysulfide shuttling
address migration rather than formation and require complicated or
expensive synthetic steps. Here, we introduce an amorphous, sulfur-rich
molybdenum sulfide as a sulfur equivalent cathode that is simple and
easy to make and shows excellent cycling performance with a specific
capacity of 537 mAh g–1 at 50 mA g–1, retaining over 200 mAh g–1 at a rate of 1 A g–1.