Electrochemical Properties and Thermal Stability of Silicon Monoxide Anode for Rechargeable Lithium-Ion Batteries

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  • FAN Hongyu
    School of Materials Science and Chemical Engineering, Ningbo University
  • LI Xiaoqing
    School of Materials Science and Chemical Engineering, Ningbo University
  • HE Huiqiu
    School of Materials Science and Chemical Engineering, Ningbo University
  • PENG Na
    School of Materials Science and Chemical Engineering, Ningbo University
  • HAN Ying
    School of Materials Science and Chemical Engineering, Ningbo University
  • LIU Zhen
    School of Materials Science and Chemical Engineering, Ningbo University
  • ZHOU Mingjiong
    School of Materials Science and Chemical Engineering, Ningbo University
  • ZHAO Liwei
    Institute for Materials Chemistry and Engineering, Kyushu University
  • OKADA Shigeto
    Institute for Materials Chemistry and Engineering, Kyushu University

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Abstract

Silicon monoxide (SiO) is utilized as an anode material in Li-ion batteries. The electrochemical properties of the SiO anodes are investigated. The SiO exhibits a high initial capacity of ∼2083 mAh g−1, while it has poor cycling stability. Thermal properties of SiO electrodes in mixing with or without the electrolyte are investigated by using DSC for the first time. Both lithiated and delithiated SiO electrodes show exothermic peaks in DSC curves, presumably due to the decomposition of electrodes. By changing the ratio between the cycled electrodes to the electrolytes, thermal behavior of the mixtures is studied in detail. The dominant exothermic peak at around 290°C is attributed to the reactions between lithiated electrode and electrolyte after the thermal breakdown of the SEI. Li in the electrodes and electrolytes should be responsible for the thermal risk in application of SiO batteries. The heat value of SiO based on capacity is estimated to be 1.85 J mAh−1, which is much smaller than that of graphite (5.11 J mAh−1). Hence, the SiO can be thermally safer than graphite.

Journal

  • Electrochemistry

    Electrochemistry 84 (8), 574-577, 2016

    The Electrochemical Society of Japan

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