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Issue 7, 2015

NaCrO2 cathode for high-rate sodium-ion batteries

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Abstract

Sodium-ion batteries offer a potential alternative or complementary system to lithium-ion batteries, which are widely used in many applications. For this purpose, layered O3-type NaCrO2 for use as a cathode material in sodium-ion batteries was synthesized via an emulsion-drying method. The produced NaCrO2 was modified using pitch as a carbon source and the products were tested in half and full cells using a NaPF6-based non-aqueous electrolyte solution. The carbon-coated NaCrO2 cathode material exhibits excellent capacity retention with superior rate capability up to a rate of 150 C (99 mA h (g oxide)−1), which corresponds to full discharge during 27 s. The surface conducting carbon layer plays a critically important role in the excellent performance of this cathode material. We confirmed the reaction process with sodium using X-ray diffraction and X-ray absorption spectroscopy. Thermal analysis using time-resolved X-ray diffraction also demonstrated the structural stability of carbon-coated Na0.5CrO2. Due to the excellent performance of the cathode material described herein, this study has the potential to promote the accelerated development of sodium-ion batteries for a large number of applications.

Graphical abstract: NaCrO2 cathode for high-rate sodium-ion batteries

Supplementary files

Article information


Submitted
03 Mar 2015
Accepted
13 May 2015
First published
13 May 2015

Energy Environ. Sci., 2015,8, 2019-2026
Article type
Paper
Author version available

NaCrO2 cathode for high-rate sodium-ion batteries

C. Yu, J. Park, H. Jung, K. Chung, D. Aurbach, Y. Sun and S. Myung, Energy Environ. Sci., 2015, 8, 2019 DOI: 10.1039/C5EE00695C

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