Microelectrode Studies on Kinetics of Charge Transfer at an Interface of Li Metal and Li₂S-P₂S₅ Solid Electrolytes (Increasing Demands for Next Generation New Rechargeable Batteries) Microelectrode Studies on Kinetics of Charge Transfer at an Interface of Li Metal and Li<sub>2</sub>S-P<sub>2</sub>S<sub>5</sub> Solid Electrolytes

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Abstract

Charge transfer kinetics at the Li metal electrode/electrolyte interface for three inorganic solid electrolytes and an organic liquid electrolyte were elucidated with two parameters, exchange current density (<i>i</i><sub>0</sub>) for Li/Li<sup>+</sup> couple reactions and ionic conductivity in electrolyte. The former was evaluated by potential step method with a microelectrode, while the latter was done by electrochemical impedance spectroscopy. Both <i>i</i><sub>0</sub> and ionic conductivity showed Arrhenius type dependence, and activation energies (<i>E</i><sub>a</sub>) for the charge transfer reactions and ionic conduction were evaluated. In the case of the organic liquid electrolyte, <i>E</i><sub>a</sub> for the Li/Li<sup>+</sup> couple reactions was higher than that for ionic conduction because of the solvation/desolvation of Li<sup>+</sup> ion. However, for the Li<sub>2</sub>S-P<sub>2</sub>S<sub>5</sub> solid solid electrolytes, the <i>E</i><sub>a</sub> for the Li/Li<sup>+</sup> couple reactions was quite close to that for ionic conduction due to the lack of the solvation/desolvation.

Journal

  • Electrochemistry

    Electrochemistry 80(10), 740-742, 2012

    The Electrochemical Society of Japan

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