@article{Li2026, 
author = {Yuqi Li and Wanli Wang and Bin Wang and Peixiang Wang and Zhengqiu He and Longsen Song and Chenhao Liu and Kai Jin and Jiwei Wang and Hao Yang and Mingbo Wu and Han Hu},
title = {Dual-beam facilitated oxygen manipulation in hard carbon for improved sodium storage},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {1},
pages = {94908317},
keywords = {sodium-ion batteries, dual-beam modified, atomic-oxygen regulation, commercial hard carbon, Na+ storage mechanism},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94908317},
doi = {10.26599/NR.2026.94908317},
abstract = {Hard carbons (HCs) are commercial anode materials for sodium-ion batteries (SIBs), yet their electrochemical performance remains limited by intrinsic structural deficiencies and insufficient Na+ storage kinetics. Herein, we report oxygen manipulation in hard carbon, enabled by plasma and laser beam, for improved Na+ storage. Starting with commercial HC electrodes, oxygen atoms were first implanted into carbon layers via atmospheric plasma treatment under controlled oxygen partial pressure. Subsequent laser irradiation induced localized thermal shocks that selectively remove oxygen atoms from edge sites, triggering transient carbon lattice rearrangement to simultaneously generate intrinsic defects and optimally sized closed nanopores (1.2–2.0 nm). This dual-stage regulation yielded HC anodes with exceptional Na+ storage properties, achieving a high reversible capacity of 335 mAh·g−1 at 30 mA·g−1 (with 36% enhancement compared with pristine HC) and enhanced Na+ diffusion. Through in situ Raman and correlated ex situ spectroscopy analyses (electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS)), we systematically decode the multiscale Na+ storage mechanism involving defect adsorption, interlayer intercalation, and nanopore filling. The proposed methodology bridges atomic-scale structural engineering with macroscopic electrode performance optimization, offering a scalable green manufacturing pathway for next-generation SIBs.}
}