High Performance Sulfide Solid-State Battery Electrolytes Regulation Mechanism: A Review

Area of Science:

• Materials Science
• Electrochemistry
• Solid-state Chemistry

Background:

• Sulfide solid electrolytes (SEs) possess high ionic conductivity and mechanical strength.
• Poor air stability and solid-solid contact hinder the application of sulfide all-solid-state batteries (ASSBs).

Purpose of the Study:

• To review the historical development and major breakthroughs of sulfide SEs.
• To discuss theories and strategies for improving the chemical stability of sulfide SEs.
• To explore thermal runaway and reaction mechanisms for enhanced stability and conductivity.

Main Methods:

• Literature review of sulfide SE development.
• Discussion of hard-soft-acid-base and glass structure theories.
• Analysis of thermodynamic and kinetic aspects of SE mechanisms.

Main Results:

• Identified key strategies for improving sulfide SE chemical stability.
• Provided insights into thermal runaway and reaction mechanisms.
• Highlighted current challenges and future research directions.

Conclusions:

• Sulfide SEs are promising for ASSBs but require stability improvements.
• Further research on stability, conductivity, and interface engineering is crucial.
• This review offers a reference for advancing sulfide SE technology.