Transition metal-doped lithium titanium oxide nanoparticles made using flame spray pyrolysis

Tommi Karhunen (Corresponding Author), Anna Lähde, Jani Leskinen, Robert Büchel, Oliver Waser, Unto Tapper, Jorma Jokiniemi

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Defect spinel phase lithium titanate (Li4Ti5O12) has been suggested as a promising negative electrode material for next generation lithium ion batteries. However, it suffers from low electrical conductivity. To overcome this problem conduction path length can be reduced by decreasing the primary particle size. Alternatively the bulk conductivity of Li4Ti5O12 can be increased by doping it with a conductive additive. In this paper a steady, single-step gas-phase technique for lithium titanate synthesis that combines both approaches is described. The process is used to produce doped Li4Ti5O12 nanoparticles with primary particle size of only 10 nm. The product is found to consist of single-crystalline nanoparticles with high phase and elemental purity. Two dopant materials are tested and found to behave very differently. The silver dopant forms a separate phase of nanometre-sized particles of metallic silver which agglomerate with Li4Ti5O12. The copper dopant, on the other hand, reacts with the lithium titanate to form a double spinel phase of Li3(Li1−2푥Cu3푥Ti5−푥)O12.
    Original languageEnglish
    Article number180821
    Number of pages6
    JournalISRN Nanotechnology
    Volume2011
    DOIs
    Publication statusPublished - 2011
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    lithium oxides
    titanium oxides
    pyrolysis
    sprayers
    flames
    lithium
    transition metals
    nanoparticles
    spinel
    silver
    electrode materials
    electric batteries
    purity
    vapor phases
    conduction
    copper
    conductivity
    electrical resistivity
    defects
    synthesis

    Cite this

    Karhunen, T., Lähde, A., Leskinen, J., Büchel, R., Waser, O., Tapper, U., & Jokiniemi, J. (2011). Transition metal-doped lithium titanium oxide nanoparticles made using flame spray pyrolysis. ISRN Nanotechnology, 2011, [180821]. https://doi.org/10.5402/2011/180821
    Karhunen, Tommi ; Lähde, Anna ; Leskinen, Jani ; Büchel, Robert ; Waser, Oliver ; Tapper, Unto ; Jokiniemi, Jorma. / Transition metal-doped lithium titanium oxide nanoparticles made using flame spray pyrolysis. In: ISRN Nanotechnology. 2011 ; Vol. 2011.
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    abstract = "Defect spinel phase lithium titanate (Li4Ti5O12) has been suggested as a promising negative electrode material for next generation lithium ion batteries. However, it suffers from low electrical conductivity. To overcome this problem conduction path length can be reduced by decreasing the primary particle size. Alternatively the bulk conductivity of Li4Ti5O12 can be increased by doping it with a conductive additive. In this paper a steady, single-step gas-phase technique for lithium titanate synthesis that combines both approaches is described. The process is used to produce doped Li4Ti5O12 nanoparticles with primary particle size of only 10 nm. The product is found to consist of single-crystalline nanoparticles with high phase and elemental purity. Two dopant materials are tested and found to behave very differently. The silver dopant forms a separate phase of nanometre-sized particles of metallic silver which agglomerate with Li4Ti5O12. The copper dopant, on the other hand, reacts with the lithium titanate to form a double spinel phase of Li3(Li1−2푥Cu3푥Ti5−푥)O12.",
    author = "Tommi Karhunen and Anna L{\"a}hde and Jani Leskinen and Robert B{\"u}chel and Oliver Waser and Unto Tapper and Jorma Jokiniemi",
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    Transition metal-doped lithium titanium oxide nanoparticles made using flame spray pyrolysis. / Karhunen, Tommi (Corresponding Author); Lähde, Anna; Leskinen, Jani; Büchel, Robert; Waser, Oliver; Tapper, Unto; Jokiniemi, Jorma.

    In: ISRN Nanotechnology, Vol. 2011, 180821, 2011.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Karhunen, Tommi

    AU - Lähde, Anna

    AU - Leskinen, Jani

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    AU - Waser, Oliver

    AU - Tapper, Unto

    AU - Jokiniemi, Jorma

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    N2 - Defect spinel phase lithium titanate (Li4Ti5O12) has been suggested as a promising negative electrode material for next generation lithium ion batteries. However, it suffers from low electrical conductivity. To overcome this problem conduction path length can be reduced by decreasing the primary particle size. Alternatively the bulk conductivity of Li4Ti5O12 can be increased by doping it with a conductive additive. In this paper a steady, single-step gas-phase technique for lithium titanate synthesis that combines both approaches is described. The process is used to produce doped Li4Ti5O12 nanoparticles with primary particle size of only 10 nm. The product is found to consist of single-crystalline nanoparticles with high phase and elemental purity. Two dopant materials are tested and found to behave very differently. The silver dopant forms a separate phase of nanometre-sized particles of metallic silver which agglomerate with Li4Ti5O12. The copper dopant, on the other hand, reacts with the lithium titanate to form a double spinel phase of Li3(Li1−2푥Cu3푥Ti5−푥)O12.

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