近日，武汉理工大学李昱团队报道了阴离子柱使高能量密度钠双离子电池具有超长循环寿命。相关论文发表在2026年2月2日出版的《德国应用化学》杂志上。

钠双离子电池因其低成本、环境友好和高工作电压等优势，成为极具前景的储能体系。然而，常用石墨阴极的结构不稳定性限制了其长循环性能，成为制约其规模化应用的关键瓶颈。

研究组首次提出在石墨阴极层间采用阴离子柱撑策略，永久性扩大并稳定石墨层间距，从而防止结构坍塌并促进阴离子的（脱）嵌入，最终实现了钠双离子电池优异的电化学性能。在200 mA g⁻¹的电流密度下，电池获得了162 mAh g⁻¹的高比容量，对应560 Wh kg⁻¹的高能量密度。

更突出的是，在2000 mA g⁻¹的高电流密度下，比容量仍可保持在101 mAh g⁻¹，循环15?500次后容量保持率高达74.0%，相当于每循环仅0.0017%的容量衰减率，且阴离子柱在石墨层间保持稳定。该研究为提高钠双离子电池中石墨阴极的性能与稳定性提供了一种新颖而有效的策略，为下一代储能体系的发展提供了重要参考。

附：英文原文

Title: Anion Pillars Enable High Energy Density Sodium Dual-Ion Battery With Ultra-Long Cycle Life

Author: Xikun Zhang, Weibin Yan, Jing Li, Yuchi Zhang, Hongtao Qu, Yuanguo Wu, Liuxi Yang, Amanda Kale, Nikolay Tumanov, Alexandru Vlad, Yu Li, Bao-Lian Su

Issue&Volume: 2026-02-02

Abstract: Sodium dual-ion batteries (SDIBs) are emerging as promising energy storage systems due to their low cost, environmental friendliness, and high operating voltage. However, the structural instability of the commonly used graphite cathode limits its long-term performance, posing a significant obstacle to large-scale applications. Here, for the first time, we report the use of the anion pillar strategy in the interlayer of the graphite cathode to expand and maintain permanently the layer spacing, preventing structural collapse and facilitating (de)intercalation, leading to an exceptional electrochemical performance of SDIBs. A high specific capacity of 162 mAh g1 at a current density of 200 mA g1, corresponding to a high energy density of 560 Wh kg1 is achieved. More impressively, the specific capacity can be maintained at 101 mAh g1 at a high current density of 2000 mA g1, with a high capacity retention of 74.0% after 15 500 cycles is obtained, corresponding to a capacity decay rate as low as 0.0017% per cycle and anion pillars remain stable in the interlayer of graphite. This study presents a novel and effective strategy for improving the performance and stability of graphite cathodes in SDIBs, offering valuable insights for the development of next-generation energy storage systems.

DOI: 10.1002/anie.202521536

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202521536