Tailoring Artificial Solid Electrolyte Interphase via MoS₂ Sacrificial Thin Film for Li-Free All-Solid-State...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Anode-free all-solid-state batteries (AFASSBs) offer high energy density and stability for electric mobility.
• Stabilizing the interface between sulfide solid electrolytes (SEs) and anode-free current collectors (CCs) is crucial but challenging.
• Controllable incorporation of materials like molybdenum disulfide (MoS2) into AFASSBs remains an unmet need.

Purpose of the Study:

• To develop a controllable strategy for interface stabilization in AFASSBs using MoS2 sacrificial thin films.
• To investigate the mechanism of MoS2 in improving lithium plating and solid electrolyte interface formation.
• To evaluate the performance enhancement of AFASSBs with MoS2-modified current collectors.

Main Methods:

• Controllable growth of MoS2 on current collectors via metal-organic chemical vapor deposition (MOCVD).
• Formation of a Mo/Li2S interlayer through a conversion reaction between MoS2 and SEs.
• Fabrication and electrochemical testing of asymmetrical and full AFASSBs with and without MoS2.

Main Results:

• The MoS2 sacrificial layer formed a beneficial Mo/Li2S interlayer, promoting uniform lithium plating by reducing nucleation overpotential.
• The MoS2-based interlayer facilitated a uniform and robust SE interface, significantly enhancing AFASSB stability.
• AFASSBs with MoS2 exhibited improved performance, including a 1.18-fold increase in initial discharge capacity and a sevenfold improvement in capacity retention compared to unmodified CCs.

Conclusions:

• Controllable MoS2 thin films effectively stabilize interfaces in AFASSBs.
• The MoS2 strategy offers a promising pathway for advancing high-performance anode-free solid-state batteries.
• Optimized MoS2 thickness is key to maximizing performance gains in AFASSBs for next-generation energy storage.