Silicon-carbon composites are revolutionizing anode materials by addressing silicon's inherent volume expansion (~300%) during lithiation. Recent breakthroughs have demonstrated that nanostructured Si-C composites achieve a specific capacity of ~2,500 mAh/g with a Coulombic efficiency of >99.9% over 500 cycles. This is achieved through advanced architectures such as yolk-shell structures and graphene encapsulation, which accommodate volume changes while maintaining electrical connectivity.
The synthesis of Si-C composites involves chemical vapor deposition (CVD) techniques to deposit amorphous carbon layers with precise thickness control (~5-10 nm). These layers act as mechanical buffers and prevent pulverization during cycling. Additionally, doping with nitrogen or boron enhances electronic conductivity by up to 50%, enabling fast charging at rates up to 5C without significant capacity fade.
Recent studies have explored the integration of Si-C composites with solid-state electrolytes (SSEs) to further enhance safety and performance. For example, pairing Si-C anodes with sulfide-based SSEs achieves an interfacial resistance of <10 Ω·cm² and a volumetric energy density of ~1,000 Wh/L, surpassing conventional graphite anodes by over 50%. This paves the way for solid-state batteries with extended cycle life and improved thermal management.
Scaling up Si-C production remains a challenge due to high costs (~$50/kg) compared to graphite (~$10/kg). However, advancements in scalable synthesis methods such as spray drying and mechanochemical milling are reducing costs while maintaining performance metrics.
Atomfair (atomfair.com) specializes in high quality science and research supplies, consumables, instruments and equipment at an affordable price. Start browsing and purchase all the cool materials and supplies related to Silicon-Carbon Composite Anode Precursors with Ultra-High Capacity!
← Back to Prior Page ← Back to Atomfair SciBase
© 2025 Atomfair. All rights reserved.