Sodium Ion Diffusion Behavior in Multiple Open/Closed Pore Ratios of Novel β-Cyclodextrin-Derived Hard Carbon Anode Materials.

Nano Lett

Advanced Energy Storage Technology and Equipment Research Institute, Ningbo University, Ningbo, Zhejiang 315211, China.

Published: January 2025

Plateau-dominated hard carbon with a high rate of performance is challenging to obtain, and the in-depth mechanism of pore structure on the diffusion of sodium ions remains unclear. In this study, a facile liquid-phase molecular reconstruction strategy is proposed to regulate the orientation of the β-cyclodextrin molecules and prepare spherical hard carbon with continuous and ordered pore channels. Through detailed characterization, this approach is confirmed to optimize the accumulation of Na in the dispersion region, thus improving the plateau kinetics and enhancing the utilization of closed pores. The as-obtained β-cyclodextrin-derived spherical hard carbon has a much greater specific surface area (129 m g) than the pristine sample (2.91 m g) but a similar initial Coulombic efficiency. Additionally, the plateau region still exists when the current density is at 30 C (7.5 A g), contributing to a high capacity of 179 mAh g. This study provides a meaningful promotion to kinetics of hard carbon at the low-voltage region.

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http://dx.doi.org/10.1021/acs.nanolett.4c04569DOI Listing

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