MoO₃@MoS₂ Core-Shell Structured Hybrid Anode Materials for Lithium-Ion Batteries.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Transition metal sulfides (TMSs) are promising anode materials for lithium-ion batteries (LIBs).
• Achieving high electrochemical performance in TMSs requires effective strategies like phase engineering.
• Molybdenum disulfide (MoS2) and molybdenum trioxide (MoO3) are key materials in this domain.

Purpose of the Study:

• To investigate a phase engineering strategy for improving the electrochemical performance of transition metal sulfides in LIB anodes.
• To synthesize and characterize MoS2 nanostructures with controllable MoS2 and MoO3 phases.
• To evaluate the performance of a phase-engineered MoO3@MoS2 hybrid as an anode material for LIBs.

Main Methods:

• One-pot hydrothermal synthesis of MoS2 nanostructures.
• Controlled calcination at temperatures between 200-300 °C to tune MoS2 and MoO3 phases.
• Electrochemical testing of synthesized materials as anode materials in LIBs.
• Analysis of Coulombic efficiency, capacity retention, and rate capability.

Main Results:

• A MoO3@MoS2 hybrid was successfully synthesized at an optimized calcination temperature of 250 °C.
• The optimized MoO3@MoS2 hybrid exhibited superior performance compared to pristine MoS2 and MoO3.
• The hybrid anode retained 564 mAh g-1 after 100 cycles with >99% Coulombic efficiency and 278 mAh g-1 at 700 mA g-1.
• Single MoS2 and MoO3 phases were produced at 200 °C and 300 °C, respectively.

Conclusions:

• Phase engineering via MoO3@MoS2 hybridization is an effective strategy to enhance LIB anode performance.
• The improved performance is attributed to the MoO3 passivation layer and reactive interfaces facilitating ion transport.
• The MoO3@MoS2 hybrid demonstrates significant potential for next-generation lithium-ion batteries.