Lin Zhiya, Wu Zhilong, Lin Hanyi, Chen Yidan, Jia Hai, Chen Quanlin, Huang Xiaohui, Ying Shaoming
College of Mathematics and Physics, Ningde Normal University, Ningde 352100, China; College of Physics and Energy, Fujian Normal University, Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center, Fuzhou 350117, China.
Fujian Provincial Key Laboratory of Featured Materials in Biochemical Industry, College of New Energy and Materials, Ningde Normal University, Ningde 352100, China; College of Chemistry, Fuzhou University, Fuzhou 350002, China.
J Colloid Interface Sci. 2025 Dec;699(Pt 1):138152. doi: 10.1016/j.jcis.2025.138152. Epub 2025 Jun 9.
Heterostructured anode materials have garnered significant attention in recent years due to their ability to optimize interfacial structures between different components. This design not only facilitates the formation of stable solid-electrolyte interphase (SEI) films but also enhances the overall electrochemical performance, including battery capacity and cycle stability. In this study, a novel N-doped carbon-modified NiSe/FeSe heterostructure combined with carbon nanotubes (NC@NFS/CNTs) composite was successfully synthesized via co-precipitation and gas-phase selenization. This material was subsequently applied as an anode for Na-ion batteries (NIBs). Based on the synergistic effect of the interfacial properties of the heterostructure and the highly conductive nature of CNTs, the NC@NFS/CNTs composite exhibited excellent electrochemical stability and superior long-term durability. The battery retains a capacity of 332.4 mAh g after 5000 charge/discharge cycles a current density of 5 A g. Moreover, the capacity retention rate remains as high as 77 % even after 10,000 cycles at an ultra-high current density of 40 A g. Ex-situ XPS and XRD analyses, along with low-temperature EIS tests, demonstrate that the Na storage properties of the NC@NFS/CNTs electrode are significantly enhanced. This improvement is primarily attributed to the heterojunction structure and the presence of highly conductive phases (CNTs and N-doped carbon layers), which effectively improve the electrode's kinetic performance and enhance the stability of the SEI film.
近年来，异质结构阳极材料因其能够优化不同组分之间的界面结构而备受关注。这种设计不仅有助于形成稳定的固体电解质界面（SEI）膜，还能提高整体电化学性能，包括电池容量和循环稳定性。在本研究中，通过共沉淀和气相硒化成功合成了一种新型的氮掺杂碳修饰的NiSe/FeSe异质结构与碳纳米管（NC@NFS/CNTs）的复合材料。该材料随后被用作钠离子电池（NIBs）的阳极。基于异质结构的界面特性和碳纳米管的高导电性的协同效应，NC@NFS/CNTs复合材料表现出优异的电化学稳定性和卓越的长期耐久性。在5 A g的电流密度下进行5000次充放电循环后，该电池的容量保持在332.4 mAh g。此外，即使在40 A g的超高电流密度下进行10000次循环后，容量保持率仍高达77%。非原位XPS和XRD分析以及低温EIS测试表明，NC@NFS/CNTs电极的储钠性能得到了显著增强。这种改善主要归因于异质结结构和高导电相（碳纳米管和氮掺杂碳层）的存在，它们有效地改善了电极的动力学性能并增强了SEI膜的稳定性。
