Hollow Structured Silicon Anodes with Stabilized Solid Electrolyte Interphase Film for Lithium-Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Silicon offers high specific capacity for next-generation lithium-ion batteries.
• Volume expansion of silicon anodes during lithiation causes interface instability and capacity fade.

Purpose of the Study:

• To design and synthesize a novel hollow structured silicon anode material.
• To address the volume expansion issue and improve the cycling stability of silicon anodes.

Main Methods:

• Synthesis of hollow structured silicon material.
• Electrochemical testing, including cycling stability measurements.
• Electrochemical impedance spectroscopy and differential scanning calorimetry to analyze SEI film formation.

Main Results:

• The hollow silicon anode demonstrated excellent cycling stability.
• Achieved a reversible capacity of approximately 1650 mAh g⁻¹ after 100 cycles.
• Maintained 92% capacity retention, indicating superior stability.
• Confirmed the formation of a stable solid electrolyte interphase (SEI) film.

Conclusions:

• Hollow structured silicon is a promising anode material for advanced lithium-ion batteries.
• The interior space of hollow silicon effectively accommodates volume changes during lithiation.
• Stable SEI film formation contributes to enhanced cycling stability and battery performance.