Synergistic Cationic–Anionic Regulation in Ni-Doped FeSe@C Anodes with Se Vacancies for High-Efficiency Sodium Storage
Sodium-ion batteries present an economical energy storage solution, yet their anode kinetics remain slow, impeding rate performance and cyclability. Layered FeSe anodes, characterized by metallic conductivity, hold potential, but structural decay and insufficient active sites during cycling continue...
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MDPI AG
2025-05-01
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| author | Liang Wang Shutong Cai Dingwen Wang Xiangyi Wang Yang Cheng |
| author_facet | Liang Wang Shutong Cai Dingwen Wang Xiangyi Wang Yang Cheng |
| author_sort | Liang Wang |
| collection | DOAJ |
| description | Sodium-ion batteries present an economical energy storage solution, yet their anode kinetics remain slow, impeding rate performance and cyclability. Layered FeSe anodes, characterized by metallic conductivity, hold potential, but structural decay and insufficient active sites during cycling continue to pose challenges. Herein, these challenges are addressed through the implementation of dual Ni doping and Se vacancy engineering in FeSe@C to synergistically regulate cationic/anionic configurations. The ionic substitution of larger Fe<sup>2+</sup> ions (0.78 Å ionic radius) with smaller Ni<sup>2+</sup> ions (0.69 Å) induces lattice distortion and generates abundant Se vacancies, enhancing electron transport, active site accessibility, and Na<sup>+</sup> adsorption. These synergistic modifications effectively boost Na<sup>+</sup> diffusion kinetics and electrolyte compatibility, creating a favorable electrochemical environment for fast sodium storage. Consequently, the optimized 2%Ni-FeSe@C electrode retains an exceptional discharge specific capacity of 307.67mAh g<sup>−1</sup> after 1000 cycles at an ultrahigh current density of 5 Ag<sup>−1</sup>, showcasing superior rate capability and long-term cycling stability, paving the way for practical high-power SIBs. |
| format | Article |
| id | doaj-art-710d4a6f6e8644b59a00447ee2613d77 |
| institution | OA Journals |
| issn | 2313-0105 |
| language | English |
| publishDate | 2025-05-01 |
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| series | Batteries |
| spelling | doaj-art-710d4a6f6e8644b59a00447ee2613d772025-08-20T02:24:35ZengMDPI AGBatteries2313-01052025-05-0111620510.3390/batteries11060205Synergistic Cationic–Anionic Regulation in Ni-Doped FeSe@C Anodes with Se Vacancies for High-Efficiency Sodium StorageLiang Wang0Shutong Cai1Dingwen Wang2Xiangyi Wang3Yang Cheng4School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaSodium-ion batteries present an economical energy storage solution, yet their anode kinetics remain slow, impeding rate performance and cyclability. Layered FeSe anodes, characterized by metallic conductivity, hold potential, but structural decay and insufficient active sites during cycling continue to pose challenges. Herein, these challenges are addressed through the implementation of dual Ni doping and Se vacancy engineering in FeSe@C to synergistically regulate cationic/anionic configurations. The ionic substitution of larger Fe<sup>2+</sup> ions (0.78 Å ionic radius) with smaller Ni<sup>2+</sup> ions (0.69 Å) induces lattice distortion and generates abundant Se vacancies, enhancing electron transport, active site accessibility, and Na<sup>+</sup> adsorption. These synergistic modifications effectively boost Na<sup>+</sup> diffusion kinetics and electrolyte compatibility, creating a favorable electrochemical environment for fast sodium storage. Consequently, the optimized 2%Ni-FeSe@C electrode retains an exceptional discharge specific capacity of 307.67mAh g<sup>−1</sup> after 1000 cycles at an ultrahigh current density of 5 Ag<sup>−1</sup>, showcasing superior rate capability and long-term cycling stability, paving the way for practical high-power SIBs.https://www.mdpi.com/2313-0105/11/6/205sodium-ion batteriesnickel dopingselenium vacanciesanode material |
| spellingShingle | Liang Wang Shutong Cai Dingwen Wang Xiangyi Wang Yang Cheng Synergistic Cationic–Anionic Regulation in Ni-Doped FeSe@C Anodes with Se Vacancies for High-Efficiency Sodium Storage Batteries sodium-ion batteries nickel doping selenium vacancies anode material |
| title | Synergistic Cationic–Anionic Regulation in Ni-Doped FeSe@C Anodes with Se Vacancies for High-Efficiency Sodium Storage |
| title_full | Synergistic Cationic–Anionic Regulation in Ni-Doped FeSe@C Anodes with Se Vacancies for High-Efficiency Sodium Storage |
| title_fullStr | Synergistic Cationic–Anionic Regulation in Ni-Doped FeSe@C Anodes with Se Vacancies for High-Efficiency Sodium Storage |
| title_full_unstemmed | Synergistic Cationic–Anionic Regulation in Ni-Doped FeSe@C Anodes with Se Vacancies for High-Efficiency Sodium Storage |
| title_short | Synergistic Cationic–Anionic Regulation in Ni-Doped FeSe@C Anodes with Se Vacancies for High-Efficiency Sodium Storage |
| title_sort | synergistic cationic anionic regulation in ni doped fese c anodes with se vacancies for high efficiency sodium storage |
| topic | sodium-ion batteries nickel doping selenium vacancies anode material |
| url | https://www.mdpi.com/2313-0105/11/6/205 |
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