Issue 16, 2025

QPHO-graphene: a two-dimensional hexagon-free carbon allotrope as a high-performance anode material for sodium-ion batteries

Abstract

Two-dimensional honeycomb carbon sheets (e.g., graphene) cannot be directly applied as sodium-ion battery (SIB) anodes due to their chemical inertness. To disrupt the delocalized π bonding network, we theoretically predict a hexagon-free carbon allotrope (called QPHO-graphene), which consists of quadrilateral, pentagonal, heptagonal, and octagonal rings. It possesses intrinsic metallicity with robust thermodynamic, mechanical and dynamic stability. As an anode material with excellent performance for SIBs, QPHO-graphene exhibits a low Na ion migration barrier (0.16 eV), a high theoretical specific capacity (1595 mA h g−1), a moderate average open-circuit voltage (0.34 V), and a minor lattice alteration (<2%). The existence of solvents having high dielectric constants can facilitate the adsorption and diffusion of Na. In addition, the appearance of a monovacancy defect enhances the binding strength of Na on QPHO-graphene but decreases the ion mobility. These findings make QPHO-graphene a potential anode material for high-performance SIBs.

Graphical abstract: QPHO-graphene: a two-dimensional hexagon-free carbon allotrope as a high-performance anode material for sodium-ion batteries

Article information

Article type
Paper
Submitted
03 Dec 2024
Accepted
13 Mar 2025
First published
14 Mar 2025

Nanoscale, 2025,17, 10250-10257

QPHO-graphene: a two-dimensional hexagon-free carbon allotrope as a high-performance anode material for sodium-ion batteries

T. Zhao, Z. Wu, X. Zheng, X. Ye, H. Lin and C. Liu, Nanoscale, 2025, 17, 10250 DOI: 10.1039/D4NR05087H

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