Issue 45, 2016

An O3-type NaNi0.5Mn0.5O2 cathode for sodium-ion batteries with improved rate performance and cycling stability

Abstract

Layered O3-type NaNi0.5Mn0.5O2 (space group: R[3 with combining macron]m) was synthesized by a sol–gel method, and subjected to electrochemical characterization for sodium-ion batteries (SIBs). A Na//NaNi0.5Mn0.5O2 cell can deliver a reversible capacity of 141 mA h g−1 in the voltage range of 2.0–4.0 V and show a good capacity retention of 90% after 100 cycles. A highly reversible structural evolution of O3hex.–O3′mon.–P3hex.–P3′mon.–P3′′hex. upon Na+ extraction and intercalation is demonstrated to be the key factor to its excellent cycling capability. Furthermore, the apparent diffusion coefficient of Na ions in the layered O3-type NaNi0.5Mn0.5O2 composite electrode can be effectively increased by using good conductive CNTs, which is demonstrated by cyclic voltammograms and the galvanostatic intermittent titration technique. Thus even at a high rate of 2C, the O3-NaNi0.5Mn0.5O2 cathode still exhibits a high reversible capacity of 80 mA h g−1. The impressive sodium storage properties of O3-NaNi0.5Mn0.5O2 make it a promising candidate as a positive electrode material for rechargeable SIBs.

Graphical abstract: An O3-type NaNi0.5Mn0.5O2 cathode for sodium-ion batteries with improved rate performance and cycling stability

Supplementary files

Article information

Article type
Communication
Submitted
02 Sep 2016
Accepted
20 Oct 2016
First published
20 Oct 2016

J. Mater. Chem. A, 2016,4, 17660-17664

An O3-type NaNi0.5Mn0.5O2 cathode for sodium-ion batteries with improved rate performance and cycling stability

P. Wang, Y. You, Y. Yin and Y. Guo, J. Mater. Chem. A, 2016, 4, 17660 DOI: 10.1039/C6TA07589D

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