Improving Lithium-Ion Half-/Full-Cell Performance of WO₃ -Protected SnO₂ Core-Shell Nanoarchitectures

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Tin dioxide (SnO2) anodes offer higher specific capacity than graphite in lithium-ion batteries (LIBs).
• Current methods for enhancing SnO2 anodes, like carbon coating, face challenges in processing and capacity limitations.
• Transition metal oxide surfacing is a key strategy for boosting battery cycling efficiency.

Purpose of the Study:

• To develop a simple and effective method for fabricating enhanced SnO2 anodes.
• To investigate the effect of a tungsten oxide (WO3) coating on SnO2 nanostructures for improved lithium-ion battery performance.
• To explore WO3 as a novel coating material for metal oxides in energy storage applications.

Main Methods:

• Fabrication of SnO2 nanostructures with a WO3 coating, creating a core-shell structure.
• Assembly and testing of coin half-cell batteries using WO3-protected SnO2 as the anode and Li-foil as the counter-electrode.
• Construction and performance evaluation of a coin-type full cell battery using WO3-protected SnO2 anode and LiFePO4 cathode.

Main Results:

• The WO3 coating provided empty space for SnO2 expansion, enhancing specific capacity over 100 cycles compared to pristine SnO2.
• WO3-protected SnO2 anodes demonstrated improved current rate capability and specific capacity.
• Significant enhancement in cyclic stability was achieved for the WO3-coated SnO2 anodes.

Conclusions:

• A simple WO3 coating effectively improves the cycling characteristics of SnO2 nanoarchitectures for lithium-ion batteries.
• The core-shell WO3/SnO2 structure offers a promising strategy for developing high-performance anode materials.
• WO3 shows potential as a versatile coating material for enhancing other metal oxide-based energy storage systems.