Preparation of brookite-type TiO 2 /carbon nanocomposite electrodes for application to Li ion batteries

Du Hee Lee, Jae Gwan Park, Jin Choi Kyoung, Heon-Jin Choi, Dong Wan Kim

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

The increasing demand for portable energy has generated significant research interest in nanostructured electrode materials, because of their large interfacial contact area with the electrolyte and short path lengths for Li ion transport. To date, titanium dioxide (TiO 2 ) has been widely investigated as an electroactive, Li-insertion host. However, the lithium reactivity of brookite-type TiO 2 has rarely been addressed compared to the common polymorphs, anatase and rutile, because of the difficulties encountered in obtaining a phase-pure brookite structure. Herein, we report on the simple synthesis of nanocrystalline brookite-type TiO 2 using titanium trichloride (TiCl 3 ) and urea [(NH 2 ) 2 CO]. The average size of the particles precipitated at 100°C was ca. 10 nm. The brookite structure was stable up to 500°C and was completely transformed to the rutile structure at 900°C in an O 2 atmosphere. We evaluated the electrochemical properties of each TiO 2 powder heat-treated sample at a preset temperature. Hybrid carbon/TiO 2 nanocomposites with high conductivity were also fabricated using a stable suspension of multiwalled carbon nanotubes (MWCNTs) in aqueous suspension with an appropriate surfactant and subsequent precipitation of TiO 2 . The carbon incorporation clearly improved the capacity retention of TiO 2 upon cycling.

Original languageEnglish
Pages (from-to)878-882
Number of pages5
JournalEuropean Journal of Inorganic Chemistry
Issue number6
DOIs
Publication statusPublished - 2008 Feb 1

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Nanocomposites
Carbon
Electrodes
Suspensions
Lithium-ion batteries
titanium dioxide
Multiwalled carbon nanotubes (MWCN)
Carbon Monoxide
Polymorphism
Electrochemical properties
Lithium
Surface-Active Agents
Powders
Electrolytes
Urea
Ions

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

Cite this

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abstract = "The increasing demand for portable energy has generated significant research interest in nanostructured electrode materials, because of their large interfacial contact area with the electrolyte and short path lengths for Li ion transport. To date, titanium dioxide (TiO 2 ) has been widely investigated as an electroactive, Li-insertion host. However, the lithium reactivity of brookite-type TiO 2 has rarely been addressed compared to the common polymorphs, anatase and rutile, because of the difficulties encountered in obtaining a phase-pure brookite structure. Herein, we report on the simple synthesis of nanocrystalline brookite-type TiO 2 using titanium trichloride (TiCl 3 ) and urea [(NH 2 ) 2 CO]. The average size of the particles precipitated at 100°C was ca. 10 nm. The brookite structure was stable up to 500°C and was completely transformed to the rutile structure at 900°C in an O 2 atmosphere. We evaluated the electrochemical properties of each TiO 2 powder heat-treated sample at a preset temperature. Hybrid carbon/TiO 2 nanocomposites with high conductivity were also fabricated using a stable suspension of multiwalled carbon nanotubes (MWCNTs) in aqueous suspension with an appropriate surfactant and subsequent precipitation of TiO 2 . The carbon incorporation clearly improved the capacity retention of TiO 2 upon cycling.",
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Preparation of brookite-type TiO 2 /carbon nanocomposite electrodes for application to Li ion batteries . / Lee, Du Hee; Park, Jae Gwan; Kyoung, Jin Choi; Choi, Heon-Jin; Kim, Dong Wan.

In: European Journal of Inorganic Chemistry, No. 6, 01.02.2008, p. 878-882.

Research output: Contribution to journalArticle

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