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N‐Doped Carbon‐Coated Ni 1.8 Co 1.2 Se 4 Nanoaggregates Encapsulated in N‐Doped Carbon Nanoboxes as Advanced Anode with Outstanding High‐Rate and Low‐Temperature Performance for Sodium‐Ion Half/Full Batteries
Author(s) -
Hou BaoHua,
Wang YingYing,
Liu DaoSheng,
Gu ZhenYi,
Feng Xi,
Fan Haosen,
Zhang Tuofeng,
Lü Changli,
Wu XingLong
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201805444
Subject(s) - materials science , anode , cathode , carbon fibers , doping , current density , chemical engineering , conductivity , nanoparticle , metal , nanotechnology , analytical chemistry (journal) , electrode , metallurgy , composite material , chemistry , optoelectronics , composite number , physics , quantum mechanics , engineering , chromatography
Transition metal selenides have been attracting significant attention owing to their high conductivity and theoretical capacity. In this article, the N‐doped carbon (NDC)‐coated Ni 1.8 Co 1.2 Se 4 nanoparticles encapsulated in NDC nanoboxes are prepared from the bi‐metal organic framework (Ni 3 [Co(CN) 6 ] 2 ·6H 2 O, Ni‐Co BMOF) after the selenization reaction and carbon coating. When used as an anode material for sodium‐ion batteries, the prepared anode material delivers excellent rate performance (211 and 153 mA h g −1 at ultrahigh current densities of 30 and 50 A g −1 , respectively) and good cycling performance (379.3 mA h g −1 at 0.5 A g −1 after 100 cycles). More importantly, it also exhibits superior sodium‐ion full cell (SIFC) performance when coupled with a high‐voltage Na 3 V 2 (PO 4 ) 2 O 2 F cathode recently self‐made by the authors. The fabricated SIFC gives an energy density up to 227 W h kg −1 and the capacity retention of above 97.6% even after 60 cycles at 0.4 A g −1 in a voltage range of 1.2–4.3 V at 25 °C. Moreover, the low‐temperature (from 25 to −25 °C) Na‐storage performance of the fabricated SIFC is also studied.