NaCrO2 cathode for high-rate sodium-ion batteries

Title
NaCrO2 cathode for high-rate sodium-ion batteries
Author
선양국
Keywords
EMULSION DRYING METHOD; RECHARGEABLE NA BATTERIES; ELECTROCHEMICAL INTERCALATION; LAYERED NACRO2; SYSTEMS
Issue Date
2015-08
Publisher
ROYAL SOC CHEMISTRY
Citation
ENERGY & ENVIRONMENTAL SCIENCE, v. 8, NO 7, Page. 2019-2026
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.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2015/EE/C5EE00695C#!divAbstracthttp://hdl.handle.net/20.500.11754/27030
ISSN
1754-5692; 1754-5706
DOI
10.1039/c5ee00695c
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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