High-Performance Si/SiOx Nanosphere Anode Material by Multipurpose Interfacial Engineering with Black TiO(2-x)

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Silicon oxides (SiOx) show promise as high-energy-density anode materials for lithium-ion batteries.
• Commercialization is hindered by low initial Coulombic efficiency and high production costs.

Purpose of the Study:

• To improve the electrochemical performance and thermal reliability of Si/SiOx nanosphere anode materials.
• To explore the impact of electroconductive black titanium dioxide (TiO(2-x)) coating on Si/SiOx anodes.

Main Methods:

• Coating Si/SiOx nanosphere anode materials with electroconductive black TiO(2-x).
• Electrochemical testing to evaluate reversible capacity, cycle performance, and Coulombic efficiency.
• Analysis of the effect of TiO(2-x) on Si species reduction and interfacial properties.

Main Results:

• The TiO(2-x) coated Si/SiOx anode achieved a high reversible capacity of 1200 mAh g(-1).
• Excellent cycle performance was observed for up to 100 cycles.
• The TiO(2-x) coating improved initial Coulombic efficiency and enhanced thermal reliability.

Conclusions:

• Electroconductive TiO(2-x) coating is an effective interfacial engineering strategy for Si/SiOx anodes.
• This approach addresses key limitations, paving the way for high-performance, commercially viable silicon-based anodes.
• The coating enhances electrochemical properties and thermal stability simultaneously.