Vertical Graphene Reinforced SiOC Microspheres for Crack-Resistant Lithium-Ion Battery Anodes

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Silicon-based anodes are crucial for next-generation lithium-ion batteries due to their high theoretical capacity.
• However, silicon anodes suffer from rapid capacity fading and electrode pulverization, limiting their practical application.
• Optimizing silicon anode structure and enhancing ion/electron transport are critical for improved performance.

Purpose of the Study:

• To develop a SiOC hybrid microsphere anode with vertical graphene sheets (VGSs) for enhanced lithium-ion battery performance.
• To investigate the synergistic effects of VGSs on the structural integrity and electrochemical kinetics of SiOC anodes.
• To provide insights into the preparation-to-failure mechanisms of advanced silicon-based anodes.

Main Methods:

• A one-step facile calcination method was employed to synthesize SiOC hybrid microspheres with surface-grown VGSs.
• The structural and morphological characteristics of the synthesized materials were analyzed.
• Electrochemical performance was evaluated using techniques such as galvanostatic cycling and rate capability tests.

Main Results:

• The VGSs effectively bridged the SiOC core and electrolyte, facilitating Li⁺ transport and mitigating stress concentration.
• The SiOC anode demonstrated superior electrochemical performance, including high specific capacity and enhanced cycling stability.
• The anode delivered a high capacity of 550 mAh g⁻¹ at 1 A g⁻¹ with 87% capacity retention over 500 cycles.

Conclusions:

• The developed SiOC hybrid microsphere with VGSs offers a promising strategy for fabricating high-performance lithium-ion battery anodes.
• The synergistic integration of SiOC and VGSs effectively addresses capacity fading and pulverization issues.
• This innovative approach paves the way for advanced silicon-based anodes with improved durability and energy storage.