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Improving the Electrochemical Performance of Lithium Metal Batteries with Hollow Shell Microspheres and Polypyrrole Vapor Phase-Coated LiV(3)O(8 )Cathodes

Authors
Bae, Ki YoonPark, Gi DaeKim, Byung HyukCho, Sung HoKang, Yun ChanLee, Kyoung DonYoon, Woo Young
Issue Date
13-9월-2018
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.165, no.13, pp.A2919 - A2924
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume
165
Number
13
Start Page
A2919
End Page
A2924
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/73109
DOI
10.1149/2.0211813jes
ISSN
0013-4651
Abstract
New hollow shell structured lithium trivanadate (LiV3O8 ) microspheres were synthesized by a spray drying method, and the effect of a vapor-phase-polypyrrole coating on the surface of this active material was studied. A thin and uniform coating layer could form by a simple vapor-phase-polymerization (VPP) method. The polypyrrole coating layer not only compensates for the low conductivity of the active material but also prevents its direct contact with the electrolyte and reduces vanadium dissolution. The LiV3O8 morphology and presence of the coating layer were confirmed using Fourier-transform infrared spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy. The electrochemical performance was analyzed using a battery testing system and impedance spectroscopy. The cycle performance of the Li-powder/polypyrrole-VPPcoated hollow shell LiV3O8 cell showed a higher capacity and greater capacity retention (LiV3O8: 160.80 mA h g (-1), 62.31%; coated LiV3O8: 206.55 mA h g (-1), 82.02%) in the range of 1.8-4.0 V at a 0.2 C-rate, even after 200 cycles. The rate capability at various current densities was also high. Further, it had a low charge transfer resistance, which remained low even after many cycles. Thus, the combined effect of hollow-shell-structure and polypyrrole-VPP coating, led LiV3O8 to its improved electrochemical performance. (C) 2018 The Electrochemical Society.
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