Multi-channel-contained few-layered MoSe ₂ nanosheet/N-doped carbon hybrid nanofibers prepared using diethylenetriamine as anodes for high-performance sodium-ion batteries

A facile new strategy for the synthesis of multi-channel-contained N-doped carbon nanofibers composed of few-layered MoSe ₂ nanosheets (denoted as MC-NCNF/MoSe ₂ ) was introduced and the composite was demonstrated as an anode material for sodium-ion batteries. This was the first time that diethylenetriamine was introduced as a pore generator in the electrospinning process and played a key role in generating multi-channels in the structure by phase-separation from the molybdenum salt and subsequent volatilization without any additional process. Polyvinylpyrrolidone was used as a carbon precursor and played the role of a N-doping source for the carbon matrix. MC-NCNF/MoSe ₂ achieved a high reversible discharge capacity of 386 mA h g ⁻¹ at a current density of 0.5 A g ⁻¹ after the 300th cycle and superior rate capability of 285 mA h g ^-1 at 10.0 A g ⁻¹ . The multi-channeled structure of MC-NCNF/MoSe ₂ facilitated effective Na ⁺ and electron diffusion during repeated discharge/charge processes and accommodated the huge volume expansion of the MoSe ₂ nanosheets induced by electrochemical reaction of the Na ⁺ ion.