anonymous团队揭示了通过单原子催化和快速充电钠离子电池形成循环调控硬碳阳极界面化学。这一研究成果于2025年3月19日发表在国际顶尖学术期刊《科学通报》上。

在这项研究中，课题组人员采用原子级钴（Co）掺杂和高电流形成循环（FC）的双重策略来有效提高硬碳材料的性能。Co原子的催化活性不仅可以调节硬碳的内在结构，还可以调节硬碳-电解质界面的电化学反应。经过FC处理后，硬碳表面迅速形成了高质量的固体电解质界面（SEI）膜，该膜富含无机成分，具有均匀性和最佳密度。这有效地减轻了表面浓度极化对Na存储行为的不利影响，同时增强了Na⁺的迁移动力学。优化后的Co-GC负极材料具有显著的Na存储容量和快速充电能力，可保持229.63 mAh g^-1在1.5 A g^-1的电流密度下，经过3000次循环。本研究强调了调节界面环境对改善HCs电化学性能的意义和机遇。

研究人员表示，硬碳（HCs）被认为是最成熟和最有商业前景的钠离子电池负极材料。然而，它们仍然面临着相对次优速率性能的挑战，这需要进一步改进。

附：英文原文

Title: Manipulating Interfacial Chemistry of Hard Carbon Anodes through Single-Atom Catalysis and Formation Cycling towards Fast-Charging Sodium-Ion Batteries

Author: anonymous

Issue&Volume: 2025/03/19

Abstract: Hard carbons (HCs) are recognized as the most mature and commercially promising anode materials for sodium-ion batteries. However, they still face the challenge of relatively suboptimal rate performance, which necessitates further improvements. In this study, we employ a dual strategy involving atomic-level cobalt (Co) doping and high-current formation cycling (FC) to effectively enhance the performance of hard carbon materials. The catalytic activity of Co atoms can not only modulate the intrinsic structure of hard carbon but also regulate the electrochemical reactions at the hard carbon-electrolyte interface. After FC process, the hard carbon surface rapidly forms a high-quality solid electrolyte interphase (SEI) film that is rich in inorganic components, exhibits uniformity and possesses an optimal density. These effectively mitigate the adverse effects of surface concentration polarization on Na storage behavior while enhancing the migration kinetics of Na+. The optimized Co-GC anode material demonstrates a remarkable Na storage capacity and fast-charging capability, maintaining a capacity of 229.63 mAh g1 after 3000 cycles at a current density of 1.5 A g1. This study highlights the significance and opportunities of regulating the interfacial environment for improving the electrochemical performance of HCs.

DOI: 10.1016/j.scib.2025.03.042

Source: https://www.sciencedirect.com/science/article/abs/pii/S2095927325003081