Rational Design of Porous Nodal-Line Semimetallic Carbon for K-Ion Battery Anode Materials

Area of Science:

• Materials Science
• Electrochemistry
• Computational Chemistry

Background:

• Potassium-ion batteries (KIBs) are a promising alternative to lithium-ion batteries (LIBs).
• Developing high-performance anode materials is crucial for advancing KIB technology.
• Key challenges include achieving high capacity, excellent rate capability, and long-term cycling stability.

Purpose of the Study:

• To computationally investigate a novel 3D porous nodal-line semimetal carbon allotrope, BDL-14.
• To evaluate BDL-14 as a potential anode material for potassium-ion batteries.
• To assess its key electrochemical properties and structural characteristics.

Main Methods:

• First-principles calculations were employed to design and analyze the BDL-14 carbon allotrope.
• The study focused on predicting properties such as mass density, carrier velocity, specific capacity, ion diffusion barriers, and volume expansion.

Main Results:

• BDL-14 exhibits a low mass density (1.41 g/cm³), ordered channels, and high carrier velocity (0.83 × 10⁶ m/s).
• It demonstrates a high specific capacity (478.23 mAh/g) and very low K-ion diffusion energy barriers (0.05–0.08 eV).
• The material shows minimal volume expansion (7.03%) during electrochemical cycling.

Conclusions:

• BDL-14 is a promising candidate for high-performance anode materials in potassium-ion batteries.
• Its unique structural and electronic properties suggest superior performance over current anode materials.
• Computational findings pave the way for experimental synthesis and validation.