Synergistic Interfacial Optimization for High-Sulfur-Content All-Solid-State Lithium-Sulfur Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Achieving high energy density in all-solid-state lithium-sulfur batteries (ASSLSBs) requires increasing sulfur content.
• Complex interfaces in ASSLSBs limit performance, especially with high sulfur loading.
• Existing singular approaches are insufficient to simultaneously optimize these critical interfaces.

Purpose of the Study:

• To develop a synergistic strategy for improving the performance of ASSLSBs with high sulfur content.
• To address the limitations imposed by complex multiinterfaces in ASSLSBs.
• To enhance ionic conductivity and interface stability for practical battery applications.

Main Methods:

• Utilizing a dual-doped sulfide solid electrolyte incorporating Y2S3 and LiI.
• Employing an SbSn alloy as a sulfur host material for the cathode.
• Investigating the synergistic effects of the doped electrolyte and alloy host on interfaces.

Main Results:

• The dual-doped electrolyte (Y2S3 and LiI) improved electrolyte-electrolyte and electrolyte-anode interfaces, enhancing ionic conductivity and suppressing dendrites.
• The SbSn alloy sulfur host facilitated Li+ transfer at electrolyte-cathode interfaces.
• ASSLSBs with over 44% sulfur content achieved high specific capacities of 1163.5 mAh g-1 at room temperature and 1408.7 mAh g-1 at 60 °C after 50 cycles.

Conclusions:

• The synergistic approach significantly improves solid-solid interfaces in ASSLSBs.
• This strategy enables high-performance ASSLSBs with high sulfur content at room temperature and elevated temperatures.
• The study presents a promising pathway for developing practical, high-energy-density all-solid-state lithium-sulfur batteries.