Electron Configuration Modulation Induced Stabilized 1T-MoS₂ for Enhanced Sodium Ion Storage.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• 1T-molybdenum disulfide (1T-MoS2) is an ideal anode for sodium-ion batteries (SIBs).
• The metastable nature of 1T-MoS2 hinders direct synthesis and leads to phase transformation into the less conductive 2H phase, degrading battery performance.
• Restacking of 1T-MoS2 layers further diminishes its electrochemical efficiency.

Purpose of the Study:

• To synthesize a stable 1T-MoS2 phase suitable for SIB anodes.
• To enhance the electrochemical properties of MoS2-based anodes through material modification.
• To investigate the potential of a novel anode material in high-performance sodium-ion batteries.

Main Methods:

• Modulating the electron configuration of Molybdenum (Mo) 4d orbitals by introducing Nickel (Ni).
• Constructing a stable 1T-Ni-MoS2 phase through Ni doping.
• Synthesizing and characterizing the 1T-Ni-MoS2 material.
• Evaluating the electrochemical performance of 1T-Ni-MoS2 as an anode in SIBs and full cells.

Main Results:

• Nickel introduction successfully stabilized the 1T phase of MoS2, preventing transformation to the 2H phase.
• The electron injection by Ni altered the Mo 4d orbital configuration, improving electrical conductivity and redox kinetics.
• 1T-Ni-MoS2 demonstrated superior rate capability (266.8 mAh g-1 at 10 A g-1) and excellent cycle life (358.7 mAh g-1 at 1 A g-1 after 350 cycles).
• Na3V2(PO4)3/C||1T-Ni-MoS2 full cells exhibited outstanding electrochemical properties.

Conclusions:

• The developed 1T-Ni-MoS2 is a highly stable and efficient anode material for sodium-ion batteries.
• Nickel doping is an effective strategy to stabilize the 1T phase of MoS2 and enhance its electrochemical performance.
• This material shows significant promise for advanced energy storage devices.