Toward efficient electrodes for a high-performance fast-charge Li-ion battery: molecular dynamics simulation and DFT...

Area of Science:

• Materials Science
• Electrochemistry
• Computational Chemistry

Background:

• Rechargeable lithium-ion batteries (LIBs) are crucial for electrochemical energy storage, but require enhanced cycling and storage capacity.
• Experimental methods for LIB development are often costly and time-consuming.
• Computational studies offer a valuable alternative for investigating battery materials and performance.

Purpose of the Study:

• To computationally investigate the potential of Cu-BHT MOF as a cathode and phosphorene as an anode for LIBs.
• To simulate the charging process and analyze lithium-ion behavior during migration under an external electrical field.
• To evaluate the performance and stability of these materials for advanced energy storage applications.

Main Methods:

• Molecular dynamics (MD) simulations were employed to study lithium-ion diffusion and behavior.
• First-principles calculations were utilized to determine lithium adsorption energies and electronic properties.
• An external electrical field was applied to simulate charging and ion migration dynamics.

Main Results:

• MSD calculations revealed distinct diffusion and cage regimes for Li-ions.
• Cu-BHT MOF cathode performance improved with higher electric fields, with significant ion migration at 1.5 V Å⁻¹.
• Stable lithium adsorption on Cu-BHT MOF (-3.21 eV) and strong Li-phosphorene interactions were observed, preventing clustering and indicating fast charging potential due to decreased band gap.

Conclusions:

• Cu-BHT MOF and phosphorene show significant promise as cathode and anode materials for high-performance LIBs.
• The study provides critical insights into ion migration, adsorption, and electronic properties relevant to battery design.
• Computational methods effectively guide the development of next-generation electrochemical energy storage solutions.