Jump to main content
Jump to site search

Issue 47, 2018
Previous Article Next Article

Investigations of the capacity fading mechanism of Na0.44MnO2via ex situ XAS and magnetization measurements

Author affiliations

Abstract

Na-ion batteries represent a promising complementary alternative to Li-ion batteries due to their high energy density and natural abundancy of Na. However, these batteries have short cycle life and extensive research activities on these batteries are required to understand the mechanism of such drawbacks. In this report, we investigate the capacity fading mechanism of Na0.44MnO2via ex situ X-ray diffraction, X-ray absorption spectroscopy, Fourier transform infrared spectroscopy and magnetization measurements. Our results show that the unit cell volume, the effective mass of Mn–O bonds, the number of Mn4+ ions and the effective magnetic moment decrease upon repeated cycling. We propose that some Mn4+ ions in the octahedral environment become Mn3+ ions in a square pyramidal environment, causing oxygen release upon cycling. Any free oxygen in the battery is expected to react with the electrolyte and cause capacity fade.

Graphical abstract: Investigations of the capacity fading mechanism of Na0.44MnO2via ex situ XAS and magnetization measurements

Back to tab navigation

Publication details

The article was received on 29 Aug 2018, accepted on 11 Nov 2018 and first published on 12 Nov 2018


Article type: Paper
DOI: 10.1039/C8DT03508C
Citation: Dalton Trans., 2018,47, 17102-17108
  •   Request permissions

    Investigations of the capacity fading mechanism of Na0.44MnO2via ex situ XAS and magnetization measurements

    S. Altin, E. Oz, E. Altin, S. Demirel, A. Bayri and S. Avci, Dalton Trans., 2018, 47, 17102
    DOI: 10.1039/C8DT03508C

Search articles by author

Spotlight

Advertisements