Hexagonal BC3: A Robust Electrode Material for Li, Na, and K Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Computational Chemistry

Background:

• Graphitic electrodes are standard in metal ion batteries.
• Exploring alternative electrode materials is crucial for advancing battery technology.

Purpose of the Study:

• To investigate the stability, maximum intercalation capacity, and voltage profiles of alkali metal intercalated hexagonal BC3 (MxBC3).
• To assess MxBC3 as a potential alternative to graphitic electrodes in metal ion batteries.

Main Methods:

• Density functional theory calculations were employed.
• Dispersion corrections were utilized for enhanced accuracy.
• Stability, intercalation capacity, and voltage profiles were systematically analyzed for Li, Na, and K intercalation.

Main Results:

• MxBC3 compounds demonstrated stability against BC3 and bulk metals.
• Maximum stable capacities were identified for specific alkali metal concentrations (x=1.5 for Li and K, x=1 for Na).
• High gravimetric capacities were achieved (up to 858 mA h/g for Li and K, 572 mA h/g for Na).
• Small open-circuit voltage variations were observed (0.49 V for Li, 0.12 V for Na, 0.16 V for K).

Conclusions:

• Hexagonal BC3 shows potential as a robust electrode material for metal ion batteries.
• The findings encourage further experimental validation of MxBC3 materials.