Ethanol Molecule Engineering Toward Stabilized 1T-MoS₂ with Extraordinary Sodium Storage Performance

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• 1T-molybdenum disulfide (1T-MoS₂) is a promising anode for sodium-ion batteries (SIBs) due to its conductivity and interlayer spacing.
• Its practical use is limited by thermodynamic metastability, complicating synthesis of stable, high-purity 1T-MoS₂.

Purpose of the Study:

• To develop a method for synthesizing stable 1T-MoS₂ for SIBs.
• To investigate the sodium storage mechanism and performance of the synthesized material.

Main Methods:

• Synergetic ethanol molecule intercalation and electron injection engineering to form and stabilize 1T-MoS₂ (E-1T MoS₂).
• Characterization of E-1T MoS₂ structure, including nanosheet morphology and interlayer spacing.
• Electrochemical testing of E-1T MoS₂ as an anode in SIBs.
• Kinetics analysis and ex-situ structural characterizations to elucidate the sodium storage mechanism.

Main Results:

• Successfully synthesized E-1T MoS₂ with sphere-like, few-layered nanosheets and expanded interlayer spacing.
• The material exhibited enhanced Na⁺ and e^- transport due to high conductivity and enlarged spacing.
• The nanosheet structure effectively managed volume changes and improved Na⁺ diffusion kinetics.
• A novel reaction mechanism involving MoS₂ nanocluster formation was identified, contributing to pseudocapacitive storage and accelerated kinetics.
• The E-1T MoS₂ electrode demonstrated excellent sodium storage performance.

Conclusions:

• The developed method effectively synthesizes stable 1T-MoS₂ for advanced SIBs.
• The unique structure and reaction mechanism of E-1T MoS₂ significantly enhance sodium storage capabilities.
• This work offers valuable insights into the synthesis and mechanism analysis of metastable metal sulfides for energy storage applications.