Effect of Li4Ti5O12 particle size on the performance of lithium ion battery electrodes at high C-rates and low temperatures

Elina Pohjalainen, Taina Rauhala, M. Valkeapää, J. Kallioinen, Tanja Kallio

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    Abstract

    Two different Li4Ti5O12 materials were investigated: smaller primary particle size forming large secondary particle aggregates (LTO-SP, surface area 22 m2/g) and larger primary particle size with less secondary particle aggregates (LTO-LP, surface area 7 m2/g). Both samples were synthesized using the same high temperature solid state synthesis but different end processing, resulting in same crystalline structure but different particle morphology. At 0.1C measured discharge capacities were close to the theoretical capacity of Li4Ti5O12 (175 mAh/g) and similar capacities were obtained at low C-rates and room temperature for both LTO-SP and LTO-LP. However, higher capacities were obtained with LTO-SP at high C-rates and -20 °C indicating beneficial effect of small particle size and large surface area. Shapes of the charge/discharge curves were different for LTO-SP and LTO-LP and this is attributed to the large surface area of LTO-SP which affects the electrochemical performance because of different reaction potentials at surface sites vs. bulk.
    Original languageEnglish
    Pages (from-to)2277-2283
    Number of pages7
    JournalJournal of Physical Chemistry C
    Volume119
    Issue number5
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Lithium titanate, surface area, particle morphology, rate capability, end processing

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