Abstract
HighlightsMoSe2/MoC/C multiphase boundaries boost ionic transfer kinetics.MoSe2 (5–10 nm) with rich edge sites is uniformly coated in N-doped framework.The obtained MoSe2 nanodots achieved ultralong cycle performance in LIBs and high capacity retention in full cell.Interface engineering has been widely explored to improve the electrochemical performances of composite electrodes, which governs the interface charge transfer, electron transportation, and structural stability. Herein, MoC is incorporated into MoSe2/C composite as an intermediate phase to alter the bridging between MoSe2- and nitrogen-doped three-dimensional (3D) carbon framework as MoSe2/MoC/N–C connection, which greatly improve the structural stability, electronic conductivity, and interfacial charge transfer. Moreover, the incorporation of MoC into the composites inhibits the overgrowth of MoSe2 nanosheets on the 3D carbon framework, producing much smaller MoSe2 nanodots. The obtained MoSe2 nanodots with fewer layers, rich edge sites, and heteroatom doping ensure the good kinetics to promote pseudo-capacitance contributions. Employing as anode material for lithium-ion batteries, it shows ultralong cycle life (with 90% capacity retention after 5000 cycles at 2 A g−1) and excellent rate capability. Moreover, the constructed LiFePO4//MoSe2/MoC/N–C full cell exhibits over 86% capacity retention at 2 A g−1 after 300 cycles. The results demonstrate the effectiveness of the interface engineering by incorporation of MoC as interface bridging intermediate to boost the lithium storage capability, which can be extended as a potential general strategy for the interface engineering of composite materials.
Highlights
Transition metal dichalcogenide (TMD) materials MX2 (M = transition metal; X = chalcogen) with lamellar struc‐ ture have received broad attentions in the fields of batteries, supercapacitors, catalysts, and sensors due to their large layer distance and high surface area [1,2,3,4,5,6]
The results demonstrate the effectiveness of the interface engineering by incorporation of MoC as interface bridging intermediate to boost the lithium storage capability, which can be extended as a potential general strategy for the interface engineering of composite materials
As a nitrogen-rich carbon network source, polyvinyl pyrrolidone (PVP) is a nonionic surfactant that can adsorb molybdate ions to facilitate the in situ forma‐ tion of Mo–C bond
Summary
The large contact area between electrode materials and electrolyte may increase the side reaction and cause the dissolution of the electrode materials Another effective strat‐ egy is making TMD and carbon composites, in which carbon serves as a soft matrix to buffer the volume variations and fast electron conductor [20,21,22,23]. The difficult can be attributed to the weak bonding between the active material and carbon substrates, or the mismatch of their volume variations, which degrade the structural stability of the electrode upon long-term cycling. 3D porous M oSe2/MoC/N–C electrodes deliver much improved long-term cycling stability. It retains 90% of its initial capacity after 5000 cycles at 2 A g−1. The assem‐ bled LiFePO4//MoSe2/MoC/N–C full cell exhibits a high reversible capacity and good cyclic stability (86% capacity retention after 300 cycles at 2 A g−1)
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