Tailoring Cathode-Electrolyte Interface for High-Power and Stable Lithium-Sulfur Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-sulfur (Li-S) batteries are attractive for energy storage due to low sulfur cost, high energy density, and resource abundance.
• Practical application is hindered by cathode-electrolyte interface issues like Li2S deposition, unstable CEI layers, and polysulfide shuttling.

Purpose of the Study:

• To comprehensively review challenges at the Li-S battery cathode-electrolyte interface.
• To outline strategies for interface optimization to enhance battery performance and stability.

Main Methods:

• Analysis of interface degradation mechanisms including Li2S deposition and polysulfide shuttle.
• Discussion of electrolyte optimization for dense CEI layer formation.
• Exploration of strategies to regulate Li2S deposition and inhibit shuttle effects across different pathways.

Main Results:

• Identified key interface challenges impeding Li-S battery performance.
• Proposed strategies focusing on electrolyte modification and controlled deposition.
• Highlighted the importance of understanding solid-liquid-solid and solid-solid pathways.

Conclusions:

• Optimizing the cathode-electrolyte interface is crucial for advancing Li-S battery technology.
• Developing strategies to create stable interfaces will accelerate the adoption of Li-S batteries.
• Further research into interface design is needed for robust energy storage solutions.