Design of boronated polysaccharide-based solid polymer electrolytes with synergistically enhanced ionic transport and...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Solid polymer electrolytes (SPEs) are crucial for next-generation batteries.
• Conventional SPEs suffer from low ionic conductivity and poor mechanical strength due to coupled ion transport and polymer motion.

Purpose of the Study:

• To develop novel SPEs with enhanced ionic conductivity and mechanical properties.
• To investigate the mechanism of ion transport in modified polysaccharide electrolytes.

Main Methods:

• Synthesized boron-modified polysaccharide electrolytes (BPS) via dehydration-induced covalent bonding.
• Characterized the structural and electrochemical properties of BPS membranes.
• Assembled and tested solid-state batteries using BPS electrolytes.

Main Results:

• BPS electrolytes exhibit highly ordered coordination sites facilitating direct Li+ conduction.
• Achieved high ionic conductivity (7.90 × 10⁻⁴ S cm⁻¹) and mechanical strength (11.70 MPa).
• Demonstrated excellent electrochemical stability (4.7 V) and over 200 stable cycles in a full cell.

Conclusions:

• The developed BPS electrolytes decouple ion conduction from polymer dynamics, offering superior performance.
• This research provides a pathway for practical solid-state battery implementation.
• Highlights the potential of boron modification for advanced electrolyte design.