Polyurethane Solid Electrolyte Interface Mechanical-Electrochemical Coupling Characteristics Enhanced by SiO₂ Aerogel...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Lithium metal batteries offer high energy density but face challenges with interface instability and lithium dendrite growth.
• Polymer solid electrolytes are crucial for solid-state lithium metal batteries due to their mechanical properties.
• Poor solid contact interfaces in current solid-state batteries are influenced by mechanical and electrochemical factors.

Purpose of the Study:

• To investigate the mechanical-electrochemical characteristics of solid electrolyte films and their influence on Li+ interface dynamics.
• To develop a polymer solid electrolyte that enhances interface stability and suppresses dendrite growth.
• To establish the mechanism of mechanical-electrochemical coupling in solid electrolyte films for practical battery applications.

Main Methods:

• Utilized polyurethane as a substrate with cross-linked SiO2 aerogel to bridge polymers.
• Synthesized a polymer solid electrolyte incorporating fluorinated polar groups and a silicon-oxygen skeleton.
• Investigated the influence of mechanical properties on electrochemical stability and interface compatibility.

Main Results:

• Achieved synergistic effects enhancing Young's modulus and mechanical stiffness.
• Improved electrochemical stability and interface compatibility of the solid electrolyte film.
• Established the mechanism of mechanical-electrochemical coupling influencing interface dynamics.

Conclusions:

• The developed polymer solid electrolyte effectively addresses interface instability and lithium dendrite growth.
• Synergistic effects of material composition enhance battery performance and safety.
• Provides a pathway for the practical application of polymer solid-state lithium metal batteries.