Electronic modulation and structure engineered MoSe2 with multichannel paths as an advanced anode for sodium-ion half/full batteries

Owing to the abundance and low price of sodium, researches on sodium-ion batteries (SIBs) as a lithium-ion battery (LIB) alternative are emerging as a consensus. It is crucial to develop electrode materials suitable for sodium storage. In recent years, two-dimensional (2D) layered transition metal disulfide compounds (TMDs) have trigered interest in the realm of energy and environmental fields. In particular, MoSe2 is thought to be a suitable material for SIBs due to its wide original layer spacing and high conductivity. Herein, N-doped dual carbon-coated MoSe2 with multichannel paths (MoSe2/multichannel carbon nanofibers (MCFs)@NC) is fabricated via electrospinning, followed by a selenation and carbonization process. The existence of a 3D conductive network, abundant void spaces, and sufficient electron transportation pathways are conducive to rapid and fast charge transfer kinetics under volume expansion stress. When applied in SIBs, the MoSe2/MCFs@NC shows a high capability (319 mA h g(-1) at 10 A g(-1)), as well as good cycling stability (303 mA h g(-1) after 1100 cycles at 10 A g(-1)). Furthermore, coupled with the Na3V2(PO4)(2)O2F cathode, the full cell also exhibits excellent performance. The theoretical calculation of the MoSe2/MCFs@NC confirms that the superiority of its SIB performance is owing to the strong interaction between the double-doped carbon and MoSe2. This scheme provides a wide space for preparing high-performance electrode materials for SIBs.