Dry-Electrode All-Solid-State Batteries Fortified with a Moisture Absorbent.

Area of Science:

• Materials Science
• Electrochemistry
• Battery Technology

Background:

• All-solid-state batteries (ASSBs) require robust solid electrolytes (SEs) with high ionic conductivity and stability.
• Argyrodite-type Li ₆PS ₅Cl (LPSCl) SE offers good ionic conductivity but suffers from hydrogen sulfide (H ₂S) emission in humid conditions, impacting ASSB performance.
• Current strategies for moisture resistance involve elemental doping or substitution, which can alter the SE structure.

Purpose of the Study:

• To enhance the moisture resistance and stability of LPSCl-based solid electrolytes in ASSBs.
• To investigate the use of zeolite imidazolate framework-8 (ZIF-8) as an integrated moisture absorbent.
• To achieve stable ASSB performance without modifying the LPSCl structure or electrode configuration.

Main Methods:

• Incorporation of ZIF-8, a highly ordered porous material, into LPSCl solid electrolyte.
• Fabrication of ASSBs using the modified LPSCl SE.
• Evaluation of ASSB cyclability and performance under operational conditions.

Main Results:

• ASSBs incorporating ZIF-8 demonstrated stable cyclability, attributed to effective and sustained moisture absorption.
• The ZIF-8 additive mitigated the detrimental effects of moisture on the LPSCl SE.
• No structural modification of the SE or electrode configuration was required.

Conclusions:

• Zeolite imidazolate framework-8 serves as an effective moisture absorbent for LPSCl solid electrolytes in ASSBs.
• This approach enhances the practical viability of sulfide-based ASSBs by improving moisture resistance and cyclability.
• The findings provide a foundation for developing more durable and reliable moisture-resistant sulfide electrolytes for next-generation batteries.