New O3-Type Layer-Structured Na0.80[Fe0.40Co0.40Ti0.20]O2 Cathode Material for Rechargeable Sodium-Ion Batteries

Herein, we formulated a new O3-type layered Na0.80[Fe0.40Co0.40Ti0.20]O2 (NFCTO) cathode material for sodium-ion batteries (SIBs) using a double-substitution concept of Co in the parent NaFe0.5Co0.5O2, having the general formula Na1-x[Fe0.5–x/2Co0.5–x/2M4+x]O2 (M4+ = tetravalent ions). The NFCTO ele...

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Bibliographic Details
Published in:Materials 2021-05, Vol.14 (9), p.2363
Main Authors: Anang, Daniel A., Bhange, Deu S., Ali, Basit, Nam, Kyung-Wan
Format: Article
Language:English
Subjects:
Asymmetry
Batteries
Cathodes
Chemical reactions
Crystal structure
Discharge
Electrochemical analysis
Electrode materials
Electrodes
Laboratories
Phase transitions
Rechargeable batteries
Redox reactions
Scanning electron microscopy
Sodium
Sodium-ion batteries
Substitution reactions
Synchrotrons
X ray absorption
X-rays
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Summary:Herein, we formulated a new O3-type layered Na0.80[Fe0.40Co0.40Ti0.20]O2 (NFCTO) cathode material for sodium-ion batteries (SIBs) using a double-substitution concept of Co in the parent NaFe0.5Co0.5O2, having the general formula Na1-x[Fe0.5–x/2Co0.5–x/2M4+x]O2 (M4+ = tetravalent ions). The NFCTO electrode delivers a first discharge capacity of 108 mAhg−1 with 80% discharge capacity retention after 50 cycles. Notably, the first charge–discharge profile shows asymmetric yet reversible redox reactions. Such asymmetric redox reactions and electrochemical properties of the NFCTO electrode were correlated with the phase transition behavior and charge compensation reaction using synchrotron-based in situ XRD and ex situ X-ray absorption spectroscopy. This study provides an exciting opportunity to explore the interplay between the rich chemistry of Na1–x[Fe0.5–x/2Co0.5–x/2M4+x]O2 and sodium storage properties, which may lead to the development of new cathode materials for SIBs.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14092363