Stable Rooted Solid Electrolyte Interphase for Lithium-Ion Batteries.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Metal oxide anodes offer high theoretical capacity for lithium-ion batteries (LIBs).
• However, they face challenges like large volume expansion and unstable solid electrolyte interphase (SEI) formation, leading to rapid capacity decay.
• Developing stable interfaces is crucial for improving LIB performance.

Purpose of the Study:

• To engineer a stable solid electrolyte interphase (SEI) on SnO2/CNF anodes for LIBs.
• To investigate the role of phosphate modification in SEI formation and stabilization.
• To enhance the cycling stability and electrochemical performance of LIBs.

Main Methods:

• Phosphate modification of SnO2/CNFs to create anode materials.
• In situ formation of a Li3PO4-rooted SEI layer during battery cycling.
• Electrochemical characterization, including galvanostatic cycling at 1 A g-1 over 1100 cycles.

Main Results:

• A stable, intact SEI layer rooted with Li3PO4 was successfully formed in situ.
• The modified anode demonstrated significantly reduced volume expansion and enhanced Li-ion diffusion.
• Ultrastable cycling performance was achieved with over 1100 cycles at 1 A g-1.

Conclusions:

• Phosphate modification effectively stabilizes the SEI layer in metal oxide anodes for LIBs.
• The Li3PO4 root and enriched LiF in the SEI synergistically improve electrochemical performance.
• This strategy offers a promising approach for developing advanced interface engineering in energy storage devices.