An unexpected phase-transformation of cobalt?vanadium layered double hydroxides toward high energy density hybrid supercapacitor

Title
An unexpected phase-transformation of cobalt?vanadium layered double hydroxides toward high energy density hybrid supercapacitor
Authors
정경윤박재호김은성김민곤이수찬Shude Liu전성찬
Issue Date
2021-02
Publisher
Journal of power sources
Citation
VOL 486, 229341
Abstract
Vanadium-based active materials have attracted attention due to their superior characteristics such as multivalent oxidation state and low cost. Here, we report a cobalt-vanadium layered double hydroxide that can be used in a high energy density hybrid supercapacitor electrode. The molar ratio of the cobalt and vanadium is controlled to enhance the charge storage performance of the proposed cathode material. The cobalt-vanadium layered double hydroxide exhibits a high specific capacitance of 1579 F g?1 at 1 A g?1 current density. We determine that this high performance is attributed to an unexpected phase transform occurring in the layered double hydroxide, which is not observed in mono metal hydroxides, during the electrochemical charging process using soft X-ray-based advanced analysis. An aqueous hybrid supercapacitor based on our cathode material shows a maximum energy density of 75.71 Wh kg?1 at a power density of 1043.72 W kg?1 with superior cycle stability (82% after 10000 cycles).
URI
http://pubs.kist.re.kr/handle/201004/72653
ISSN
0378-7753
Appears in Collections:
KIST Publication > Article
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