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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Polysulfide intercalation in bilayer-structured graphitic C₃N₄: a first-principles study.

Sinan Li¹, Shaobin Yang, Ding Shen

¹College of Mining Engineering, Liaoning Technical University, Fuxin 123000, P. R. China.

Physical Chemistry Chemical Physics : PCCP

|December 5, 2017

Summary

This summary is machine-generated.

Bilayer graphitic carbon nitride (bi-C₃N₄) effectively binds sulfur and lithium polysulfides, suppressing the shuttling effect in lithium-sulfur batteries. Its unique pore structure enhances performance and stability.

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Area of Science:

Materials Science
Electrochemistry
Computational Chemistry

Background:

Lithium-sulfur (Li-S) batteries offer high theoretical capacity, making them attractive for energy storage.
The shuttling effect of lithium polysulfides (LiPSs) and solvent degradation limit Li-S battery performance.
Graphitic carbon nitride (g-C₃N₄) is explored as a potential host material.

Purpose of the Study:

To investigate the interactions between bilayer graphitic carbon nitride (bi-C₃N₄) and key components of Li-S batteries.
To understand the role of bi-C₃N₄'s pore structure in mitigating LiPSs shuttling and solvent reactions.
To provide theoretical guidance for improving Li-S battery performance using g-C₃N₄-based composites.

Main Methods:

First-principles calculations were employed to study the adsorption and binding energies.
The interactions of bi-C₃N₄ with S₈, LiPSs, and ether-based solvents were analyzed.
The electronic properties and pore structures of bi-C₃N₄ were examined.

Main Results:

Bi-C₃N₄ exhibits strong binding with S₈ and LiPSs via Li-N bonds.
Interlayer pores (5.5-7.2 Å) effectively trap LiPSs, suppressing the shuttling effect.
Ultramicropores (<4 Å) accommodate Li₂S₂/Li₂S and prevent solvent degradation.
The energy gap of bi-C₃N₄ narrows during lithiation.

Conclusions:

Bi-C₃N₄ demonstrates significant potential as a host material for Li-S batteries.
The specific pore structure and chemical bonding of bi-C₃N₄ are crucial for enhancing electrochemical performance.
These findings offer a pathway for designing advanced microporous g-C₃N₄/sulfur composites.