Self‐Polymerized Disordered Carbon Enabling High Sodium Storage Performance through Expanded Interlayer Spacing by Bound Sulfur Atoms

An effective strategy to fabricate sulfur‐doped carbon with tunable doping sites is developed using a one‐step pyrolytic technique. Applied as Na‐storage anode, this sulfur‐doped carbon exhibits high reversible capacity, excellent rate capability (330 mAh g −1 at 0.02 A g −1 and 158 mAh g −1 at 5 A g −1 ), as well as superior durability (159 mAh g −1 over 10000 cycles at 2 A g −1 with 95.7 % retention). Experimental characterization and theoretical calculation reveal that interlayer C−S−C bonds not only expand the d 002 spacing, but also provide an alternative pathway for electron transport. This improves Na + ion intercalation/deintercalation capability and electronic conductivity.