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Na 3 V 2 (PO 4 ) 3 /N‐doped Carbon Nanocomposites with Sandwich Structure for Cheap, Ultrahigh‐Rate, and Long‐Life Sodium‐Ion Batteries
Author(s) -
Yang Wenhao,
He Wen,
Zhang Xudong,
Yang Guihua,
Ma Jingyun,
Wang Yaoyao,
Wang Chunlian
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801802
Subject(s) - nanocomposite , materials science , electrochemistry , carbon fibers , vanadium , cathode , sodium , doping , ion , chemical engineering , inorganic chemistry , nanotechnology , electrode , chemistry , composite number , composite material , organic chemistry , metallurgy , optoelectronics , engineering
A new nanocomposite composed of ultrathin Na 3 V 2 (PO 4 ) 3 /N‐doped carbon sheets with stable sandwich structure is reported. The material is synthesized using laminar vanadium metal‐organic frameworks (V‐MOFs) as the precursor and multifunction sodium lignosulfonate (SLS) as the organic ligand for the V‐MOFs and the carbon source. The synthetic mechanism and the influence of the SLS and Na contents on the electrochemical properties are investigated, and the Na‐ion insertion/extraction mechanism in the sandwich framework structure is established. The nanocomposite with the molar ratio: V 2 O 5 /SLS/Na 2 CO 3 =2 : 1.5 : 1.7, used as a cathode material for sodium‐ion batteries, not only exhibits the best discharge capacity (117.3 mA h g −1 at the 0.1 C rate), but also ultra‐high rate performances (82 mAh g −1 at 100 C, 78 mAh g −1 at 200 C and 54 mAh g −1 at 250 C) and a long cycling life (retains 40 mAh g −1 at 200 C over 6000 cycles) because of its unique nanostructure.