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MOF‐Derived Porous Ni x Fe 3‐ x O 4 Nanotubes with Excellent Performance in Lithium‐Ion Batteries
Author(s) -
Xia Yuan,
Wang Beibei,
Wang Gang,
Liu Xiaojie,
Wang Hui
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500419
Subject(s) - materials science , anode , bimetallic strip , faraday efficiency , current density , porosity , chemical engineering , lithium (medication) , oxide , annealing (glass) , nanotube , nanotechnology , metal , electrode , composite material , metallurgy , carbon nanotube , chemistry , medicine , physics , quantum mechanics , endocrinology , engineering
Ni–Fe bimetallic oxide nanotubes with a hollow and porous structure were synthesized by using metal‐organic framework (MOF) annealing processes. The Ni/Fe molar ratios in the binary metal oxide were rationally designed. Typically, Ni 0.62 Fe 2.38 O 4 (called NFO‐0.25) nanotubes with a tube shell of around 10 nm possess a specific surface area of 134.3 m 2 g −1 and are composed of nanosized primary particles. The lithium‐ion battery performance of the nanotube anode was evaluated by galvanostatic and rate cycling. In the half‐cell, a high capacity of 1184 mA h g −1 for the NFO‐0.25 anode was maintained at a current density of 0.25 A g −1 after 200 cycles. In addition, the NFO‐0.25/LiCoO 2 full‐cell has a reversible charge capacity of about 94 mAh g −1 with a high coulombic efficiency at the same current density. The feature of hollow and porous structures remarkably buffers the volume variation, and provides more active sites for lithiation–delithiation reactions, resulting in excellent lithium‐storage performance.