Electron-Injection and Atomic-Interface Engineering toward Stabilized Defected 1T-Rich MoS₂ as High Rate Anode for Sodium Storage

Abstract

1T-phase MoS2 is a promising electrode material for electrochemical energy storage due to its metallic conductivity, abundant active sites, and high theoretical capacity. However, because of the habitual conversion of metastable 1T to stable 2H phase via restacking, the poor rate capacity and cycling stability at high current densities hamper their applications. Herein, a synergetic effect of electron-injection engineering and atomic-interface engineering is employed for the formation and stabilization of defected 1T-rich MoS2 nanoflowers. The 1T-rich MoS2 and carbon monolayers are alternately intercalated with each other in the nanohybrids. The metallic 1T-phase MoS2 and conductive carbon monolayers are favorable for charge transport. The expanded interlayer spacing ensures fast electrolyte diffusion and the decrease of the ion diffusion barrier. The obtained defected 1T-rich MoS2/m-C nanoflowers exhibit high Na-storage capacity (557 mAh g–1 after 80 cycles at 0.1 A g–1), excellent rate capacity (411 mAh g–1 at 10 A g–1), and long-term cycling performance (364 mAh g–1 after 1000 cycles at 2 A g–1). Furthermore, a Na-ion full cell composed of the 1T-rich MoS2/m-C anode and Na3V2(PO4)3/C cathode maintains excellent cycling stability at 0.5 A g–1 during 400 cycles. Theoretical calculations are also performed to evaluate the phase stability, electronic conductivity, and Na+ diffusion behavior of 1T-rich MoS2/m-C. The energy storage performance demonstrates its excellent application prospects.

Anion Defects Engineering of Ternary Nb-Based Chalcogenide Anodes Toward High-Performance Sodium-Based Dual-Ion Batteries

“…Furthermore, the density of states (DOS) value of NbSSe is higher than that of NbS 2 , which indicates the introduction of anion defect can optimize the electronic structure and facilitate electron transfer efficiency, agreeing with the electrical conductivity result (Fig. 4 j) [ 44 ]. As indicated in Figs.…”

Rational design of coral ball-like MoS2/N-doped carbon nanohybrids via atomic interface engineering for effective sodium/potassium storage

“…S10 (ESI †), the voltage range of 0.5-3.7 V for the full cell is optimized according to the voltage ranges of the MoS 2 /N-C anode and NVP/C cathode. 39 The full cell was evaluated at 0.5 A g À1 within a cutoff voltage window of 0.5-3.7 V and the capacity is calculated based on the MoS 2 /N-C anode in the full cell. The galvanostatic discharge-charge curves (Fig.…”

An interlayer spacing design approach for efficient sodium ion storage in N-doped MoS2

“…11 Metal dihalide compounds are suitable electrode materials for batteries because of their large interlayer spacing, which enables more ions to be stored. [12][13][14][15][16] Among them, the twodimensional (2D) nanomaterial MoS 2 with a special S-Mo-S sandwich structure has been widely used as an electrode material for rechargeable batteries. [17][18][19] MoS 2 has attracted great attention due to its high theoretical capacity (670 mA h g À1 ), which is double that of graphite, and it is comparatively cheaper.…”