Silicon-Based Polymer-Derived Ceramics as Anode Materials in Lithium-Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Graphite anodes in lithium-ion batteries have limited specific capacity (372 mAh∙g^-1).
• Silicon anodes offer high theoretical capacity (4200 mAh∙g^-1) but suffer from >300% volume expansion and capacity fade.
• Silicon-based polymer-derived ceramics (PDCs) are emerging as next-generation anode materials.

Purpose of the Study:

• To review the progress of silicon oxycarbide (SiOC), silicon carbonitride (SiCN), silicon boron carbonitride (SiBCN), and silicon oxycarbonitride (SiOCN) as anode materials for lithium-ion batteries (LIBs).
• To summarize synthesis, structural characteristics, and electrochemical properties of these Si-based PDCs.
• To elucidate the lithium-ion storage mechanisms in these advanced anode materials, highlighting the role of free carbon.

Main Methods:

• Review of synthesis routes for SiOC, SiCN, SiBCN, and SiOCN.
• Analysis of structural characteristics and their impact on electrochemical performance.
• Investigation of electrochemical properties, including capacity and cycling stability.
• Summary of lithium-ion storage mechanisms.

Main Results:

• Si-based PDCs exhibit unique nano-cluster structures, tunable compositions, and low volume expansion.
• These materials demonstrate maximum capacities exceeding 1000 mAh∙g^-1.
• Customizable synthesis routes allow tailoring for specific electrochemical applications.

Conclusions:

• Si-based PDCs represent a highly promising class of anode materials for high-performance lithium-ion batteries.
• Their advantages include high capacity, improved stability due to controlled volume expansion, and tunable properties.
• Further research into their synthesis and lithium-ion storage mechanisms can optimize their commercial viability.