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Solvothermal approach to nanocrystalline Li–Ti–O insertion hosts–solvent polarity effect

Published online by Cambridge University Press:  31 January 2011

Tereza Kostlánová ,
Marina V. Makarova  and
Petr Krtil
Tereza Kostlánová
Affiliation:
J. Heyrovsky Institute of Physical Chemistry v.v.i, Academy of Sciences of the Czech Republic, Dolejskova 3, 18223 Prague, Czech Republic
Marina V. Makarova
Affiliation:
J. Heyrovsky Institute of Physical Chemistry v.v.i, Academy of Sciences of the Czech Republic, Dolejskova 3, 18223 Prague, Czech Republic
Petr Krtil*
Affiliation:
J. Heyrovsky Institute of Physical Chemistry v.v.i, Academy of Sciences of the Czech Republic, Dolejskova 3, 18223 Prague, Czech Republic
*
a)Address all correspondence to this author. e-mail: Petr.Krtil@jh-inst.cas.cz
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Abstract

The cubic nanocrystalline Li–Ti–O oxides were prepared by the solvothermal reaction of TiO2 and LiOH at 200 °C in water and aliphatic alcohols with different dielectric constants. The reaction in all solvents leads to the formation of white ternary compounds containing Li, Ti, and O. The actual Li content in the prepared materials increases with decreasing polarity of the used solvent. All prepared materials are crystalline, and their structure can be described using a spinel structural model. The structure of materials prepared at a relative dielectric constant (ϵr) value higher than 33 is characterized by Ti disorder when the Ti atoms are distributed between both types of the available octahedral sites with approximately the same probability. The tendency to form phases with Ti disorder decreases with decreasing ϵr of the solvent. All prepared materials are active toward electrochemical Li insertion. The observed specific capacity ranges between 60 and 150 mAh/g.

Keywords

Energy-storageHydrothermalNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 4 , April 2008 , pp. 1136 - 1146
Copyright
Copyright © Materials Research Society 2008

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