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Title: Spatial extent of lithium intercalation in anatase TiO[sub 2]

Abstract

Thin smooth anatase TiO[sub 2] films are obtained by electron beam evaporation of reduced TiO[sub 2]. These films show a preferential (004) orientation when deposited on electron beam evaporated amorphous titanium. Electrochemical lithium insertion into these films is studied with several optical and electrochemical techniques. A coloration efficiency of 13 cm[sup 2] C[sup [minus]1] is found, which is twice as high as that reported for TiO[sub 2] films grown by chemical vapor deposition (CVD). Potential-dependent capacitance measurements show that after the extraction of lithium ions has taken place a small region at the surface of the electrode has a much higher dielectric constant than that of the bulk of the electrode. This is explained by the presence of irreversibly trapped lithium ions in the region where a (reversible) phase transformation from anatase TiO[sub 2] to anatase Li[sub 0.5]TiO[sub 2] has occurred. The extent of this region depends strongly on the intercalation potential; values of 7 and 17 nm are found after 2.5 h of intercalation at [minus]1.0 and [minus]1.2 V vs SCE, respectively. The dielectric constant of the modified surface region is found to range between 500 and 900. A scheme is proposed that describes the mechanism of lithium insertionmore » in terms of a moving TiO[sub 2][vert bar]Li[sub 0.5]TiO[sub 2] phase front.« less

Authors:
; ;  [1]
  1. (Delft Univ. of Technology (Netherlands). Lab. for Inorganic Chemistry)
Publication Date:
OSTI Identifier:
6105868
Alternate Identifier(s):
OSTI ID: 6105868
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical
Additional Journal Information:
Journal Volume: 103:34; Journal ID: ISSN 1089-5647
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DIELECTRIC PROPERTIES; ELECTRON BEAMS; EVAPORATION; LITHIUM; THIN FILMS; TITANIUM OXIDES; ALKALI METALS; BEAMS; CHALCOGENIDES; ELECTRICAL PROPERTIES; ELEMENTS; FILMS; LEPTON BEAMS; METALS; OXIDES; OXYGEN COMPOUNDS; PARTICLE BEAMS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS 360606* -- Other Materials-- Physical Properties-- (1992-)

Citation Formats

Krol, R. van de, Goossens, A., and Schoonman, J. Spatial extent of lithium intercalation in anatase TiO[sub 2]. United States: N. p., 1999. Web. doi:10.1021/jp9909964.
Krol, R. van de, Goossens, A., & Schoonman, J. Spatial extent of lithium intercalation in anatase TiO[sub 2]. United States. doi:10.1021/jp9909964.
Krol, R. van de, Goossens, A., and Schoonman, J. Thu . "Spatial extent of lithium intercalation in anatase TiO[sub 2]". United States. doi:10.1021/jp9909964.
@article{osti_6105868,
title = {Spatial extent of lithium intercalation in anatase TiO[sub 2]},
author = {Krol, R. van de and Goossens, A. and Schoonman, J.},
abstractNote = {Thin smooth anatase TiO[sub 2] films are obtained by electron beam evaporation of reduced TiO[sub 2]. These films show a preferential (004) orientation when deposited on electron beam evaporated amorphous titanium. Electrochemical lithium insertion into these films is studied with several optical and electrochemical techniques. A coloration efficiency of 13 cm[sup 2] C[sup [minus]1] is found, which is twice as high as that reported for TiO[sub 2] films grown by chemical vapor deposition (CVD). Potential-dependent capacitance measurements show that after the extraction of lithium ions has taken place a small region at the surface of the electrode has a much higher dielectric constant than that of the bulk of the electrode. This is explained by the presence of irreversibly trapped lithium ions in the region where a (reversible) phase transformation from anatase TiO[sub 2] to anatase Li[sub 0.5]TiO[sub 2] has occurred. The extent of this region depends strongly on the intercalation potential; values of 7 and 17 nm are found after 2.5 h of intercalation at [minus]1.0 and [minus]1.2 V vs SCE, respectively. The dielectric constant of the modified surface region is found to range between 500 and 900. A scheme is proposed that describes the mechanism of lithium insertion in terms of a moving TiO[sub 2][vert bar]Li[sub 0.5]TiO[sub 2] phase front.},
doi = {10.1021/jp9909964},
journal = {Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical},
issn = {1089-5647},
number = ,
volume = 103:34,
place = {United States},
year = {1999},
month = {8}
}