Zhiyuan Guo, Mei Yang, Qi Fan, Yuting Chen, Teng Xu, Chenying Li, Zhengyang Li, Zhiyuan Li, Qin Sun, Hui Xia
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引用次数: 0
摘要
阴极和阳极界面的固体电解质相间物(SEI)的特性对于钠离子电池(SIB)的性能至关重要。这项研究证明了平衡有机成分(特别是本研究中的有机烷基磺酸钠 (ROSO2Na))与无机氟化钠 (NaF) 结合使用可增强界面稳定性的优点。通过使用定制的电解液,它优化了相间,抑制了过量 NaF 的产生,并形成了薄而均匀的富含 NaF/ROSO2Na 的 SEI 层。它为防止界面劣化和过渡金属溶解提供了卓越的保护,同时确保了界面阻抗的持续降低。这种创新方法大大提高了 Na0.9Ni0.4Fe0.2Mn0.4O2 阴极和硬碳阳极的性能。阴极的平均库仑效率超过 99.9%,500 个循环后的容量保持率达到 81%。此外,Ah 级袋式电池表现出色,400 次循环后容量保持率达 87%。这些结果超越了目前对富含无机 SEI 的关注,凸显了定制的有机-无机混合 SEI 配方在改进 SIB 技术方面的有效性,提供了一种可确保卓越界面稳定性的适应性解决方案。
Inorganic-Enriched Solid Electrolyte Interphases: A Key to Enhance Sodium-Ion Battery Cycle Stability?
The characteristics of solid electrolyte interphase (SEI) at both the cathode and anode interfaces are crucial for the performance of sodium-ion batteries (SIBs). The research demonstrates the merits of a balanced organic component, specifically the organic sodium alkyl sulfonate (ROSO2Na) featured in this work, in conjunction with the inorganic sodium fluoride (NaF), to enhance the interfacial stability. Using a customized electrolyte, it has optimized the interphase, curbing excess NaF production, and created a thin and uniform NaF/ROSO2Na-rich SEI layer. It offers exceptional protection against interface deterioration, transition metal dissolution, and concurrently ensures a consistent reduction in interfacial impedance. This creative approach results in a substantial improvement in the performance of both the Na0.9Ni0.4Fe0.2Mn0.4O2 cathode and the hard carbon anode. The cathode demonstrates remarkable average Coulombic efficiency exceeding 99.9% and a capacity retention of 81% after 500 cycles. Furthermore, the Ah-level pouch cell has shown outstanding performance with an 87% capacity retention after 400 cycles. Moving beyond the prevailing focus on inorganic-rich SEI, these results highlight the effectiveness of the customized organic-inorganic hybrid SEI formulation in improving SIB technology, offering an adaptable solution that ensures superior interfacial stability.
期刊介绍:
Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments.
With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology.
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