Identification and characterisation of high energy density P2-type Na2/3[Ni1/3−y/2Mn2/3−y/2Fey]O2 compounds for Na-ion batteries

J. W. Somerville; R. A. House; N. Tapia-Ruiz; A. Sobkowiak; S. Ramos; A. V. Chadwick; M. R. Roberts; U. Maitra; P. G. Bruce

doi:10.1039/C7TA09607K

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Identification and characterisation of high energy density P2-type Na_2/3[Ni_1/3−y/2Mn_2/3−y/2Fe_y]O₂ compounds for Na-ion batteries†‡

J. W. Somerville,

^a R. A. House,

^a N. Tapia-Ruiz,

^ac A. Sobkowiak,^a S. Ramos,^b A. V. Chadwick,^b M. R. Roberts,^a U. Maitra^a and P. G. Bruce

*^a

Author affiliations

* Corresponding authors

^a Depts of Materials and Chemistry, University of Oxford, Parks Rd, Oxford, UK
E-mail: peter.bruce@materials.ox.ac.uk

^b School of Physical Sciences, University of Kent, Canterbury, Kent, UK

^c Department of Chemistry, University of Lancaster, Lancaster, UK

Abstract

The composition space between MnO₂, NaFeO₂, and Na[Ni_1/2Mn_1/2]O₂ has been explored with the goal of identifying Earth-abundant single-phase P2 cathode materials. This has led to the identification of two compounds, P2-Na_2/3[Ni_1/3−y/2Mn_2/3−y/2Fe_y]O₂ (y = 1/6, 1/3) which exhibit state of the art specific energies. These materials were further evaluated through galvanostatic cycling and X-ray absorption spectroscopy.

This article is part of the themed collection: Advances in Solid State Chemistry and its Applications

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Article information

DOI: https://doi.org/10.1039/C7TA09607K
Article type: Communication
Submitted: 31 okt 2017
Accepted: 13 fev 2018
First published: 26 fev 2018

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J. Mater. Chem. A, 2018,6, 5271-5275

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Identification and characterisation of high energy density P2-type Na_2/3[Ni_1/3−y/2Mn_2/3−y/2Fe_y]O₂ compounds for Na-ion batteries

J. W. Somerville, R. A. House, N. Tapia-Ruiz, A. Sobkowiak, S. Ramos, A. V. Chadwick, M. R. Roberts, U. Maitra and P. G. Bruce, J. Mater. Chem. A, 2018, 6, 5271 DOI: 10.1039/C7TA09607K

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Journal of Materials Chemistry A