Open AccessMacaroni‐Like Blue‐Gray Nb 2 O 5 Nanotubes for High‐Reversible Lithium‐Ion Storage
Author(s) -
Wang Lei,
Zeng Xianxiang,
Huang Fei,
Li Caoyuxi,
Liu Ying,
Zhu Qinshu,
Dai Zhihui
Publication year - 2021
Publication title -
advanced energy and sustainability research
Language(s) - English
Resource type - Journals
ISSN - 2699-9412
DOI - 10.1002/aesr.202100028
Subject(s) - materials science , anode , x ray photoelectron spectroscopy , vacancy defect , graphite , electrochemistry , annealing (glass) , chemical vapor deposition , cathode , intercalation (chemistry) , graphene , chemical engineering , nanotechnology , analytical chemistry (journal) , crystallography , electrode , inorganic chemistry , chemistry , metallurgy , chromatography , engineering
Due to the high reliability and high theoretical capacity, lithium‐ion batteries (LIBs) have been widely studied in the world. Nevertheless, the existing LIB systems currently exhibit comparatively low capacities restricted by the anode materials. Herein, blue‐gray Nb 2 O 5 (B‐Nb 2 O 5 ) nanotubes are prepared which are rich in oxygen vacancy by a facile chemical vapor deposition (CVD) method and a further hydrogen annealing reduction as the anode material for LIBs, presenting a high discharge capacity of 375 mA h g −1 at 100 mA g −1 and a good rate performance up to 5 A g −1 with 126 mA h g −1 . The detailed ex situ X‐ray diffraction (XRD) and X‐ray photoelectron spectra (XPS) characterizations verified the high‐reversible process, which Li + should insert into/extract from the (001) planes of Nb 2 O 5 crystal. Combined with a reversible PF 6 ‐ intercalation into/deintercalation from graphite cathode, a B‐Nb 2 O 5 /graphite dual‐ion cell can run about 50 cycles with the discharge capacity retention approaching 23 mA h g −1 at 100 mA g −1 . The importance of the modulation of morphology and vacancy in improving overall electrochemical performance is highlighted.