NaCrO2 cathode for high-rate sodium-ion batteries

Title
NaCrO2 cathode for high-rate sodium-ion batteries
Authors
유찬엽박재상정훈기정경윤Doron Aurbach선양국명승택
Issue Date
2015-07
Publisher
Energy & environmental science
Citation
VOL 8, 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.kist.re.kr/handle/201004/49989
ISSN
17545692
Appears in Collections:
KIST Publication > Article
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