An economic integrated self-standing Anode@Quasi-solid-state electrolyte membrane for high-performance lithium-ion...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Solid-state lithium-ion batteries (SSLIBs) are crucial for next-generation high energy density storage.
• The
• shuttle effect
• and poor interfacial properties hinder SSLIB performance.
• Developing integrated anode-electrolyte systems is key to overcoming these challenges.

Purpose of the Study:

• To propose and validate an integrated anode and quasi-solid-state electrolyte strategy for SSLIBs.
• To enhance interfacial properties and eliminate the
• shuttle effect
• in SSLIBs.
• To develop a cost-effective and efficient method for producing advanced SSLIBs.

Main Methods:

• Fabrication of a self-standing Si/SiC/C nanofiber composite film (SNF) anode via magnesiothermic reduction of silica-coated electro-spun polyacrylonitrile (PAN) nanofibers.
• Integration of the SNF anode with a PAN-based quasi-solid-state electrolyte membrane (SNF@PAN-E and SNF@PANS-15-E).
• Characterization of interfacial resistance, ionic conductivity, electrochemical window, and cycling stability of the developed battery components and full cells.

Main Results:

• Achieved extremely low interfacial resistance (down to 8.6 Ω) for the integrated anode@electrolyte membrane (SNF@PAN-E) after 100 cycles.
• Developed a quasi-solid-state electrolyte (PANS-15-E) with improved ionic conductivity (8.0 mS cm^-1), Li ion migration number (0.76), and electrochemical window (5.1 V).
• Demonstrated excellent cycling stability and rating performance in SNF@PAN-E|Li and SNF@PANS-15-E|Li batteries, with a full LFP battery retaining >90 mAh g^-1 after 580 cycles at 5.9C without an anode current collector.

Conclusions:

• The integrated anode@electrolyte membrane strategy is highly effective for improving SSLIB performance.
• The developed materials offer a promising pathway for economic and efficient production of advanced solid-state batteries.
• This approach addresses key challenges in SSLIB technology, enabling safer and higher-performing energy storage solutions.