Issue 9, 2015

Characterization of a thin, uniform coating on P2-type Na2/3Fe1/2Mn1/2O2 cathode material for sodium-ion batteries

Abstract

A thin, uniform carbon coating on Na2/3Fe1/2Mn1/2O2 (NFMO) using 2,3-dihydroxynaphthalene (DN) was prepared. Pristine and DN-coated samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). An amorphous nanolayer coating of carbon is obtained on the surface of the layered pristine material. The 0.2 wt% DN-coated NFMO exhibits excellent electrochemical performance. An initial discharge capacity of 178 mA h gāˆ’1 was obtained at a C-rate of 0.1 C; this capacity is 20% higher than bare NFMO. Capacity retention (77.8% at the 50th cycle) is also maintained comparable to bare NFMO (77.7% at the 50th cycle). The thin and uniform carbon layer leads to improvement of charging and discharging kinetics and protects against direct contact between cathode and electrolyte.

Graphical abstract: Characterization of a thin, uniform coating on P2-type Na2/3Fe1/2Mn1/2O2 cathode material for sodium-ion batteries

Supplementary files

Article information

Article type
Communication
Submitted
13 Sep 2014
Accepted
11 Dec 2014
First published
22 Dec 2014

RSC Adv., 2015,5, 6340-6344

Author version available

Characterization of a thin, uniform coating on P2-type Na2/3Fe1/2Mn1/2O2 cathode material for sodium-ion batteries

K. Park, D. Han, J. Shon, S. G. Doo and S. Lee, RSC Adv., 2015, 5, 6340 DOI: 10.1039/C4RA10346G

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