Huang Qianhui, You Shunzhang, Yang Chenghao
China Southern Power Grid Technology Co., Ltd., Guangzhou 510080, China.
Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
Micromachines (Basel). 2025 Jun 30;16(7):771. doi: 10.3390/mi16070771.
Sodium-ion batteries (SIBs) have been considered as a promising alternative to lithium-ion batteries (LIBs) for large-scale energy storage. However, the commercial graphite anode is not suitable for SIBs due to its low Na ion storage capability. Currently, hard carbon has been considered a promising anode material for SIBs. Herein, the surface porousized hard carbon anode materials have been prepared by using hydrogen peroxide (HO) with a hydrothermal method (HC-HO) and utilized as the anode material for SIBs. The porous structure of HC-HO provides more storage space for Na ions and enhances the intercalation/deintercalation reversibility and diffusion rate of Na ions. Moreover, HC-HO can effectively alleviate the particle volume expansion and generate a thin and stable SEI film during charge/discharge processes. Thus, the HC-HO exhibits a high reversible capacity (314.4 mAh g with an ICE of 92.3% at 0.05 C), excellent rate performance (241.4 mAh g at 3 C), and outstanding cycling stability (a capacity retention of 78.6% after 500 cycles at 1 C). The preparation of porous hard carbon provides new ideas for the future development direction of hard carbon.
钠离子电池（SIBs）被认为是用于大规模储能的锂离子电池（LIBs）的一种有前景的替代方案。然而，商用石墨负极由于其低钠离子存储能力而不适用于钠离子电池。目前，硬碳被认为是一种有前景的钠离子电池负极材料。在此，通过水热法使用过氧化氢（HO）制备了表面多孔化的硬碳负极材料（HC-HO），并将其用作钠离子电池的负极材料。HC-HO的多孔结构为钠离子提供了更多的存储空间，并提高了钠离子的嵌入/脱嵌可逆性和扩散速率。此外，HC-HO可以有效缓解颗粒体积膨胀，并在充放电过程中生成薄而稳定的固体电解质界面（SEI）膜。因此，HC-HO表现出高可逆容量（在0.05 C下为314.4 mAh g，初始库仑效率为92.3%）、优异的倍率性能（在3 C下为241.4 mAh g）和出色的循环稳定性（在1 C下500次循环后容量保持率为78.6%）。多孔硬碳的制备为硬碳未来的发展方向提供了新思路。
