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Calcination Temperature Effect on Citrate‐Capped Iron Oxide Nanoparticles as Lithium‐Storage Anode Materials
Author(s) -
Jung Won Sik,
Oh HangDeok,
Kadam Abhijit N.,
Lee SangWha
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201701004
Subject(s) - calcination , hematite , materials science , crystallinity , magnetite , anode , chemical engineering , lithium (medication) , oxide , iron oxide , precipitation , metallurgy , chemistry , electrode , catalysis , composite material , medicine , physics , meteorology , engineering , endocrinology , biochemistry
In this work, citrate‐capped magnetites (cit‐Fe 3 O 4 ) are facilely synthesized according to a modified co‐precipitation method, and the resulting cit‐Fe 3 O 4 underwent thermal calcination under N 2 flow for 2 h. The calcined cit‐Fe 3 O 4 at 500 °C, so‐called C‐Fe 3 O 4 (500 °C), exhibits the XRD patterns attributed mainly to the fcc crystalline phases of magnetite (Fe 3 O 4 ). On the other hand, the calcined cit‐Fe 3 O 4 at 700 °C, so‐called C‐Fe 2 O 3 (700 °C), exhibits the X‐ray diffraction (XRD) patterns attributed mostly to hexagonal crystalline phases of hematite (α‐Fe 2 O 3 ). The iron oxides calcined at different temperatures (500, 600, 700 °C) are employed as active anode materials for Li‐ion batteries. After 80 cycles at the current rate of 0.1 C, the C‐Fe 2 O 3 (700 °C) exhibits the higher reversible capacity by ≈200% than that of the C‐Fe 3 O 4 (500 °C). The improved reversible capacity of the C‐Fe 2 O 3 (700 °C) is attributed to the transformation of magnetite phases into hematite phases with higher crystallinity, which is more beneficial for faster transfer of charge carriers and structural stability.