期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 43, 页码 51095-51106出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c16957
关键词
anodes; yolk-shell structure; N-doped dual carbon; sodium-ion batteries; ultralong cycle life
资金
- National Natural Science Foundation of China [51674068, 51874079, 51804035, 11775226]
- Natural Science Foundation of Hebei Province [E2021501029, E2018501091, E2020501001]
- Hebei Province Key Research and Development Plan Project [19211302D]
- Fundamental Research Funds for the Central Universities [N2123035, N182304018, N2023040, N182304015]
- Natural Science Foundation of Liaoning Province [2019-MS-110]
- Research Project on the Distribution of Heavy Metals in Soil and Comprehensive Utilization Technology of Tailings in Typical Iron Tailing Reservoir Areas of Hebei Province [802060671901]
Transition metal selenides show promise as anodes for sodium-ion batteries due to their high conductivity and theoretical capacity, but face challenges such as volume expansion and sluggish dynamics. A study successfully fabricated nitrogen-doped carbon-coated FeSe2 nanoparticles in NC nanoboxes, improving the rate performance and long-cycling stability of the composite material. The FeSe2@NDC NBs also demonstrated remarkable sodium-storage performance when combined with a Na3V2(PO4)3@C cathode in full cells.
Thanks to their high conductivity and theoretical capacity, transition metal selenides have demanded significant research attention as prospective anodes for sodium-ion batteries. Nevertheless, their practical applications are hindered by finite cycle life and inferior rate performance because of large volume expansion, polyselenide dissolution, and sluggish dynamics. Herein, the nitrogen-doped carbon (NC)-coated FeSe2 nanoparticles encapsulated in NC nanoboxes (termed FeSe2@NDC NBs) are fabricated through the facile thermal selenization of polydopamine-wrapped Prussian blue precursors. In this composite, the existing nitrogen-doped dual carbon layer improves the intrinsic conductivity and structural integrity, while the unique porous yolk-shell architecture significantly mitigates the volume swelling during the sodium/desodium process. Moreover, the derived Fe-N-C bonds can effectively capture polyselenide, as well as promote Na+ transportation and good reversible conversion reaction. As expected, the FeSe2@NDC NBs deliver remarkable rate performance (374.9 mA h g(-1) at 10.0 A g(-1)) and long-cycling stability (403.3 mA h g(-1) over 2000 loops at 5.0 A g(-1)). When further coupled with a self-made Na3V2(PO4)(3)@C cathode in sodium-ion full cells, FeSe2@NDC NBs also exhibit considerably high and stable sodium-storage performance.
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