Charge storage mechanism of MnO<inf>2</inf> cathodes in Zn/MnO<inf>2</inf> batteries using ionic liquid-based gel polymer electrolytes

Journal ar
Electrochemistry Communications
  • Volumen: 60
  • Fecha: 01 November 2015
  • Páginas: 190-194
  • ISSN: 13882481
  • Source Type: Journal
  • DOI: 10.1016/j.elecom.2015.09.011
  • Document Type: Article
  • Publisher: Elsevier Inc.
© 2015 Elsevier B.V.All rights reserved. Cathode reactions in Zn/MnO<inf>2</inf> batteries using aqueous electrolytes have been usually interpreted by the reduction of Mn<sup>4 +</sup> to Mn<sup>3 +</sup> while protons and/or cations penetrate inside the cathode. However, until now, the MnO<inf>2</inf> storage charge mechanism using a non-aqueous gel polymer electrolyte (GPE) has not been investigated. In this work, ionic liquid-based GPEs including BMIM Tf and ZnTf<inf>2</inf> have been employed in Zn/MnO<inf>2</inf> batteries. Different states of charge of MnO<inf>2</inf> cathodes used in Zn/IL-GPE/MnO<inf>2</inf> batteries have been analyzed by XPS and EDX techniques. XPS analysis showed that Mn<sup>4 +</sup> is reduced during the discharge process at the same time as Zn<sup>2 +</sup> cations are incorporated into the cathode. Besides, Zn<sup>2 +</sup> cations insertion is accompanied by triflate anions.

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