NaCrO2 cathode for high-rate sodium-ion batteries
- Authors
- Yu, Chan-Yeop; Park, Jae-Sang; Jung, Hun-Gi; Chung, Kyung-Yoon; Aurbach, Doron; Sun, Yang Kook; Myung, Seung-Taek
- Issue Date
- Jul-2015
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- ENERGY & ENVIRONMENTAL SCIENCE, v.8, no.7, pp.2019 - 2026
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENERGY & ENVIRONMENTAL SCIENCE
- Volume
- 8
- Number
- 7
- Start Page
- 2019
- End Page
- 2026
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/24925
- DOI
- 10.1039/c5ee00695c
- ISSN
- 1754-5692
- 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 nonaqueous 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.
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