Cationic-Zwitterionic Polymer Electrolytes with Enhanced Ionic Conductivity and Lithium-Ion Selectivity for...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Polymer electrolytes are promising for solid-state lithium-metal batteries due to good interfacial compatibility and processability.
• A major challenge is achieving both high ionic conductivity and a high lithium-ion transference number.

Purpose of the Study:

• To develop novel polymer electrolytes with simultaneously high ionic conductivity and enhanced lithium-ion selectivity.
• To address limitations in current solid-state battery electrolyte technology.

Main Methods:

• Synthesized cationic-zwitterionic polymer electrolytes.
• Incorporated cationic segments to immobilize anions and sulfonate groups for ion mobility.
• Conducted structural and electrochemical analyses.

Main Results:

• The new electrolytes demonstrated high ionic conductivity and selective lithium-ion transport.
• Electrolytes showed stability and good performance in lithium symmetric cells and Li||LiFePO4 batteries.
• A 1.2 Ah pouch cell confirmed practical scalability and safety.

Conclusions:

• Cationic-zwitterionic polymer electrolytes offer a viable solution for high-performance solid-state lithium-metal batteries.
• These electrolytes enhance lithium-ion selectivity and conductivity, paving the way for next-generation batteries.