Two-dimensional Dirac TiB₂C₂ as a potential anode material for Li-ion batteries: a first-principles study

Area of Science:

• Materials Science
• Condensed Matter Physics
• Electrochemistry

Background:

• Developing advanced anode materials is critical for enhancing battery performance.
• Existing materials face challenges in stability, capacity, and ion diffusion.
• Two-dimensional (2D) materials offer unique properties for energy storage applications.

Purpose of the Study:

• To investigate the potential of TiB2C2 as a novel 2D anode material for lithium-ion batteries.
• To evaluate its structural, electronic, and electrochemical properties using first-principles calculations.
• To assess its stability and performance metrics for practical applications.

Main Methods:

• First-principles calculations were employed to predict the properties of TiB2C2.
• Thermodynamic, dynamic, and thermal stability analyses were performed.
• Lithium adsorption energies and diffusion pathways were systematically studied.
• Electrochemical performance indicators like capacity and voltage were simulated.

Main Results:

• TiB2C2 exhibits excellent thermodynamic, dynamic, and thermal stability, indicating feasibility for experimental synthesis.
• The material demonstrates high lithium adsorption energy sites, crucial for ion storage.
• TiB2C2 possesses good ionic and electronic conductivity with a suitable voltage profile.
• A high theoretical storage capacity of 1075 mA h g-1 was predicted with minimal structural change (1.12%).

Conclusions:

• The TiB2C2 monolayer is a stable and promising 2D material for lithium-ion battery anodes.
• Its Dirac cone states and structural integrity contribute to excellent electrochemical performance.
• TiB2C2 presents a viable candidate for next-generation high-capacity energy storage devices.