Ingeniously Designed Yolk–Shell-Structured FeSe2@NDC Nanoboxes as an Excellent Long-Life and High-Rate Anode for Half/Full Na-Ion Batteries

• Published in: ACS applied materials & interfaces Vol. 13; no. 43; pp. 51095 - 51106
• Main Authors: Feng, Jian, Luo, Shao-hua, Zhan, Yang, Yan, Sheng-xue, Li, Peng-wei, Zhang, Lin, Wang, Qing, Zhang, Ya-hui, Liu, Xin
• Format: Journal Article
• Language: English
• Published: American Chemical Society 03.11.2021
• Subjects: Energy, Environmental, and Catalysis Applications; anodes; yolk−shell structure; sodium-ion batteries; ultralong cycle life; N-doped dual carbon
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.1c16957

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.