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Unique Structural Changes of Three‐Dimensionally Ordered Macroporous TiO 2 Electrode Materials During Electrochemical Cycling
Author(s) -
Kim Hyejung,
Kim Min Gyu,
Cho Jaephil
Publication year - 2012
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201200416
Subject(s) - materials science , orthorhombic crystal system , amorphous solid , intercalation (chemistry) , electrode , phase (matter) , colloidal crystal , lithium (medication) , electrochemistry , crystal structure , colloid , chemical engineering , nanotechnology , crystallography , inorganic chemistry , chemistry , medicine , organic chemistry , engineering , endocrinology
Structural changes during lithium intercalation (to x = 1.1 in Li x TiO 2 ) are studied in three‐dimensionally ordered macroporous (3DOM)‐TiO 2 (figure) prepared by colloidal crystal templating. During the charging/discharging cycles, the pristine crystalline domains are pulverized to smaller nanodomains (∼4 nm), but the original 3DOM structure remains robust and maintains its pristine pore‐wall thickness. The long‐range ordered crystalline orthorhombic phase is partially transformed into the short‐range order amorphous phase and Jahn–Teller distortion is also observed.