Issue 31, 2018

On the dynamics of transition metal migration and its impact on the performance of layered oxides for sodium-ion batteries: NaFeO2 as a case study

Abstract

Transition metal (TM) layered oxides constitute one of the most promising families of compounds for the cathode of Na-ion batteries. However, their structural stability at the charged state is a critical performance limiting factor, which is believed to be closely related to irreversible TM migration into the Na layers. Nevertheless, experimental evidence of this TM migration and its influence on the electrochemical performance is still scarce, while the understanding of such a phenomenon constitutes a key step for developing better performing TM layered oxides. Here NaFeO2 has been studied as a model system, since it is expected to produce one of the most pronounced TM migrations and provide possibly one of the highest theoretical energy densities of TM layered oxides. By combining the Potential Intermittent Titration Technique (PITT), Electrochemical Impedance Spectroscopy (EIS) and operando X-ray diffraction, it has been possible to analyze the structural evolution of NaxFeO2, track the iron migration and observe its influence on the insertion capacity and Na diffusivity.

Graphical abstract: On the dynamics of transition metal migration and its impact on the performance of layered oxides for sodium-ion batteries: NaFeO2 as a case study

Supplementary files

Article information

Article type
Paper
Submitted
16 Mar 2018
Accepted
05 Jul 2018
First published
06 Jul 2018

J. Mater. Chem. A, 2018,6, 15132-15146

Author version available

On the dynamics of transition metal migration and its impact on the performance of layered oxides for sodium-ion batteries: NaFeO2 as a case study

B. Silván, E. Gonzalo, L. Djuandhi, N. Sharma, F. Fauth and D. Saurel, J. Mater. Chem. A, 2018, 6, 15132 DOI: 10.1039/C8TA02473A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements