Electrochemical Investigations on TiO2-B Nanowires as a Promising High Capacity Anode for Sodium-ion Batteries

Jeongyeon Lee, Joong Kee Lee, Kyung Yoon Chung, Hun Gi Jung, Haesik Kim, Junyoung Mun, Wonchang Choi

    Research output: Journal article publicationJournal articleAcademic researchpeer-review

    40 Citations (Scopus)

    Abstract

    We report the electrochemical behaviors of TiO2-B nanowire electrodes exhibiting a high operating potential where they can avoid severe Na plating and a de-sodiation capacity of 196 mAh g-1, which is the highest among several types of titanium oxides reported for sodium ion batteries. When TiO2-B nanowires are used as negative electrodes for sodium ion batteries, 1 mole of the TiO2-B nanowire can take up approximately 1 mole of sodium ions during the sodiation process and reversibly relieve 0.6 mole of intercalated sodium during the subsequent de-sodiation process. It has been proved that TiO2-B nanowire electrodes participate in a reversible single-phase Na insertion/desertion reaction during charge and discharge. The electrodes exhibit irreversible capacity, owing to electrolyte decomposition and residual irreversible Na insertion, as determined via in situ XRD, ICP, FE-SEM, XPS, and electrochemical analyses. Further, TiO2-B is a superior material exhibiting long and stable cyclability with a specific capacity of 150 mAh g-1 over 50 cycles.

    Original languageEnglish
    Pages (from-to)21-28
    Number of pages8
    JournalElectrochimica Acta
    Volume200
    DOIs
    Publication statusPublished - 10 May 2016

    Keywords

    • bronze
    • nanowires
    • sodium-ion batteries
    • titanate

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Electrochemistry

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