Electrode-Electrolyte Interfaces in Lithium-Sulfur Batteries with Liquid or Inorganic Solid Electrolytes

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Electrode-electrolyte interfacial properties critically impact lithium-sulfur (Li-S) battery cycling performance.
• Key interfacial issues include reactions, layer formation, ionic transport, and thermodynamic/kinetic behaviors.
• Unique electrolyte compositions in Li-S batteries (ether-based solvents, LiNO3) necessitate distinct interfacial theories compared to Li-ion batteries.

Purpose of the Study:

• To review state-of-the-art understanding of solid-electrolyte interphase (SEI) formation and properties in liquid-electrolyte Li-S batteries.
• To explore interfacial challenges and research progress in all-solid-state and hybrid-electrolyte Li-S batteries.
• To suggest future research directions for optimizing electrode-electrolyte interfaces in Li-S batteries.

Main Methods:

• Review of existing literature on SEI in liquid-electrolyte Li-S batteries.
• Analysis of interfacial properties in solid-state and hybrid-electrolyte Li-S battery concepts.
• Discussion of strategies for improving SEI stability and electrode-solid electrolyte interfaces.

Main Results:

• SEI properties significantly affect overall Li-S battery performance.
• Solid-state and hybrid electrolytes face challenges with low ionic conductivity and poor electrode-electrolyte interfacial properties.
• Current approaches have not yet yielded satisfactory cell performance.

Conclusions:

• Further research into electrode-electrolyte interfacial behaviors is essential for advancing Li-S battery technology.
• Developing strategies to manipulate and stabilize these interfaces is key to overcoming current limitations.
• Exploring novel concepts like semi-solid-state Li-S batteries may offer new avenues for improvement.