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Biomimetic Straw‐Like Bundle Cobalt‐Doped Fe 2 O 3 Electrodes towards Superior Lithium‐Ion Storage
Author(s) -
Liu Miao,
Liu Yongmei,
Li Youpeng,
Wang Kang,
Guo Yayun,
Li Yanxin,
Zhao Lingzhi
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201805546
Subject(s) - anode , materials science , electrochemistry , lithium (medication) , cobalt , electrode , ion , doping , hydrothermal circulation , chemical engineering , current density , bundle , analytical chemistry (journal) , chemistry , composite material , optoelectronics , chromatography , metallurgy , medicine , organic chemistry , engineering , endocrinology , physics , quantum mechanics
Biomimetic straw‐like bundles of Co‐doped Fe 2 O 3 (SCF), with Co 2+ incorporated into the lattice of α‐Fe 2 O 3 , was fabricated through a cost‐effective hydrothermal process and used as the anode material for lithium‐ion batteries (LIBs). The SCF exhibited ultrahigh initial discharge specific capacity (1760.7 mA h −1 g −1 at 200 mA g −1 ) and cycling stability (with the capacity retention of 1268.3 mA h −1 g −1 after 350 cycles at 200 mA g −1 ). In addition, a superior rate capacity of 376.1 mA h −1 g −1 was obtained at a high current density of 4000 mA g −1 . The remarkable electrochemical lithium storage of SCF is attributed to the Co‐doping, which increases the unit cell volume and affects the whole structure. It makes the Li + insertion–extraction process more flexible. Meanwhile, the distinctive straw‐like bundle structure can accelerate Li ion diffusion and alleviate the huge volume expansion upon cycling.