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

The composition space between MnO2, NaFeO2, and Na[Ni1/2Mn1/2]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-Na2/3[Ni1/3−y/2Mn2/3−y/2Fey]O2 (y = 1/6, 1/3) which exhibit state of the art speci...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018-01, Vol.6 (13), p.5271-5275
Main Authors: Somerville, J W, House, R A, Tapia-Ruiz, N, Sobkowiak, A, Ramos, S, Chadwick, A V, Roberts, M R, Maitra, U, Bruce, P G
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Batteries
Electrode materials
Flux density
Manganese dioxide
Rechargeable batteries
Sodium-ion batteries
X-ray absorption spectroscopy
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Summary:The composition space between MnO2, NaFeO2, and Na[Ni1/2Mn1/2]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-Na2/3[Ni1/3−y/2Mn2/3−y/2Fey]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.
ISSN:2050-7488
2050-7496
DOI:10.1039/c7ta09607k