Issue 23, 2017, Issue in Progress

Impact of cobalt content in Na0.67MnxFeyCozO2 (x + y + z = 1), a cathode material for sodium ion batteries

Abstract

Due to the toxicity and price of cobalt (Co), Na0.67MnxFeyCozO2 (NaMFC) was tested as a cathode material for Na-ion batteries with lower cobalt contents. The objective was to set the Co to a maximum of 0.15 and compensate its loss by changing the ratio of Mn or Fe. The synthesized compounds were compared to two reference materials Na0.67Mn0.5Fe0.25Co0.25O2 and Na0.67Mn0.5Fe0.5O2. Microscopy (SEM), X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS) and electrochemical tests were performed to characterize the pristine samples and to understand the impact of the cobalt on the electrochemical mechanism. A link was established between the amount of Co in the NaMFC material and the oxidation state of the Mn in the discharged sample. We confirmed that the role of the cobalt is to prevent a high Mn(III) ratio in the compound and thus help to limit the fading of the electrochemical performance. The compound Na0.67Mn0.5Fe0.35Co0.15O2 offers a good compromise between electrochemical stability and lower Co content.

Graphical abstract: Impact of cobalt content in Na0.67MnxFeyCozO2 (x + y + z = 1), a cathode material for sodium ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
13 Jan 2017
Accepted
17 Feb 2017
First published
01 Mar 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 13851-13857

Impact of cobalt content in Na0.67MnxFeyCozO2 (x + y + z = 1), a cathode material for sodium ion batteries

C. Marino, E. Marelli and C. Villevieille, RSC Adv., 2017, 7, 13851 DOI: 10.1039/C7RA00566K

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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