Electrochemically Formed NaxMn[Mn(CN)6] Thin Film Anodes Demonstrate Sodium Intercalation and Deintercalation at Extremely Negative Electrode Potentials in Aqueous Media

Jeongsik Yun, Florian A. Schiegg, Yunchang Liang, Daniel Scieszka, Batyr Garlyyev, Anika Kwiatkowski, Thomas Wagner, Aliaksandr S. Bandarenka

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The development of electrode materials for Na-ion batteries has been substantially accelerated recently with respect to application in grid energy storage systems. Specifically, development of Na-ion batteries operating in aqueous media is considered more promising for this application due to safety issues. Many different types of cathode materials for aqueous Na-ion batteries have been proposed; however, the number and performance of contemporary anode materials are still insufficient for practical deployment. In this work, we demonstrate that electrochemically deposited NaxMn[Mn(CN)6] thin films are very promising anode materials for aqueous Na-ion batteries. NaxMn[Mn(CN)6] films exhibit (i) very low half-charge potential ca. -0.73 V vs SHE (ca. -0.93 V vs SSC) being one of the lowest among those reported in the literature for the electrode materials, which also inhibit hydrogen evolution reaction; (ii) a specific capacity of ca. 85 mA h g-1 and (iii) only ∼3% loss of capacity and high round-trip efficiency (99.6%) after 3,000 cycles. Surprisingly, the choice of the electrolyte composition has a very strong influence not only on the intercalation process but also on the long-term performance of battery anodes and their electrode surface morphology.

Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalACS Applied Energy Materials
Volume1
Issue number1
DOIs
StatePublished - 22 Jan 2018

Keywords

  • Na intercalation
  • Na-ion battery anodes
  • NaMn[Mn(CN)]
  • aqueous Na-ion batteries
  • electrochemical impedance spectroscopy

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