Stable Li⁺/Na⁺ Batteries with Anodes Boosted by Hollow Tubular-Structured MoS₂ Nanosheet/N-Doped Carbon Nanosheet Composites

Engineering a hollow architecture has been regarded as an efficient strategy for boosting energy storage and conversion. Herein, hollow hierarchical carbon nanotubes coupled with MoS2 nanosheets were successfully designed and fabricated to construct high-performance lithium-/sodium-ion batteries. A tubular Mo–polydopamine hybrid precursor was formed by a simple metal chelation reaction and a self-template effect, and subsequently in situ converted into MoS2 nanosheets embedded into carbon nanotubes after heat treatment. Benefiting from the synergistic effect between strong coupling hierarchical carbon/MoS2 nanosheets and a tubular hollow structure, the as-prepared electrode exhibited an outstanding storage capacity and an ultrastable cycling stability for lithium-/sodium-ion storage. Evaluated as an anode for a lithium-ion battery, it presented a high-rate capacity of 1228.2 mA h g–1 at 1000 mA g–1. As for a sodium-ion battery, a capacity of 210.1 mA h g–1 can be maintained after 9000 cycles under a high current density of 8000 mA g–1. The storage mechanism analysis indicated that the charge–discharge process was dominated by a pseudocapacitive behavior. The present work highlights the synthesis of electrode materials with a hierarchical hollow structure to boost the development of electrochemical energy storage.