Preparation of lithium indium oxide via a rheological phase route and its electrochemical characteristics in LiOH and Li2SO4 solutions

Authors

  • Guo-Qing Zhang,

    Corresponding author
    1. Department of Chemistry and Environment Science of Yangtze Normal University, 408100 Chongqing, P. R. China
    2. College of Chemistry and Chemical Engineering of Chongqing University, Chongqing 400030, P. R. China
    • Phone: +86 023 72790008, Fax: +86 023 72790008
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  • Sheng-Tao Zhang,

    1. College of Chemistry and Chemical Engineering of Chongqing University, Chongqing 400030, P. R. China
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  • Xing-Fa Wu

    1. Department of Chemistry and Environment Science of Yangtze Normal University, 408100 Chongqing, P. R. China
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Abstract

Submicrometer-sized lithium indium oxide (LiInO2) powder via a rheological phase method using trilithium citrate tetra hydrate (C6H5Li3O7 · 4H2O) and indium oxide (In2O3) has been prepared in this work for the first time. The optimal pyrolyzing temperature range to prepare crystalline LiInO2 is between 650 and 900 °C, which was confirmed by thermal gravimetric and differential thermogravimetric analysis of the precursor and X-ray diffraction analysis. The pure phase LiInO2 sample obtained has a uniform particle morphology and submicrosize, which was observed by scanning electron microscopy. The electrochemical studies show that a new pair of cathodic and anodic peaks at 0.23 and 0.38 V (vs. saturated calomel electrode) was obviously observed from the cyclic voltammetry curve of LiInO2 in 1 M LiOH solution, indicating a battery characteristic of the material in this electrolyte. While in 1 M Li2SO4 solution, the sample presents a supercapacitive characteristic within the same potential range. The reasons for different electrochemical behaviors in these two electrolytes can be attributed to the fact that the reaction of lithium ion insertion/extraction into/out of a LiInO2 electrode takes place in the bulk material in LiOH electrolyte solution, whereas it takes place on the electrode/electrolyte interface for Li2SO4 electrolyte case.

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