近日，华中科技大学王成亮团队研究了高性能低温钠离子电池用truxenone基共价有机骨架/碳纳米管复合材料。该研究于2025年9月9日发表在《德国应用化学》杂志上。

低温可充电电池由于反应动力学缓慢而面临巨大挑战。具有孔结构的氧化还原共价有机框架（COFs）为加快低温离子扩散和反应动力学提供了可行的解决方案。然而，COFs在低温电池中的应用还处于起步阶段。

研究组报道了一种含有truxenone基COF和少量碳纳米管的用于低温钠离子电池的复合电极。truxenone基COF具有较高的活性中心比和较高的理论容量；而碳纳米管则保证了活性位点的可及性、电荷转移效率和快速反应动力学。因此，复合电极在0.05 A g⁻¹时显示出365 mAh g⁻¹的高可逆容量（减去碳贡献后为295 mAh g^–1）。值得注意的是，它具有优异的低温性能，在0°C下保持263.8 mAh g⁻¹（减去碳贡献后为203 mAh g^–1）的高放电容量，相当于室温下容量的74%。

即使在-30°C的极端天气下，100次循环后，容量仍保持156.8 mAh g⁻¹（减去碳贡献后为119 mAh g^–1），容量保持率为97%。该工作阐明了truxenone基COF的快速离子扩散与CNTs优异的电荷转移的协同效应，为低温钠离子电池的实现提供了可行的途径。

附：英文原文

Title: Truxenone-Based Covalent Organic Framework/Carbon Nanotube Composite for High-Performance Low-Temperature Sodium-Ion Batteries

Author: Shuangqin Yang, Jingmei Wu, Zixuan Shan, Xinya Zhang, Jianyi Chu, Yuan Chen, Chengliang Wang

Issue&Volume: 2025-09-09

Abstract: Low-temperature rechargeable batteries face great challenges due to the sluggish reaction kinetics. Redox covalent organic frameworks (COFs) with porous structures provide a viable solution to accelerate the ionic diffusion and reaction kinetics at low temperatures. However, the applications of COFs in low-temperature batteries are still at their infancy stage. Here, a composite electrode containing truxenone-based COF and a small amount of CNTs is reported for low-temperature sodium-ion batteries. The truxenone-based COF possesses high ratio of active centers and enables high theoretical capacity; while the CNTs guarantee the accessibility of the active sites, the charge transfer efficiency, and the fast reaction kinetics. As a result, the composite electrode shows a high reversible capacity of 365 mAh g1 at 0.05 A g1 (295 mAh g1 after subtracting carbon contribution). Notably, it offers excellent low-temperature performance that maintains a high discharge capacity of 263.8 mAh g1 (203 mAh g1 after subtracting carbon contribution) at 0 °C, which represents 74% of the capacity at room temperature. Even under extreme weather of 30 °C, the capacity maintains 156.8 mAh g1 (119 mAh g1 after subtracting carbon contribution) after 100 cycles, with a capacity retention rate of 97%. This work illustrates the synergistic effect of the fast ionic diffusion of truxenone-based COF and the excellent charge transfer of the CNTs, offering a feasible way to realize low-temperature sodium-ion batteries.

DOI: 10.1002/anie.202511714

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202511714