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Facile synthesis of multi-shell structured binary metal oxide powders with a Ni/Co mole ratio of 1:2 for Li-Ion batteries

Authors
Choi, Seung HoPark, Sun KyuLee, Jung KulKang, Yun Chan
Issue Date
15-6월-2015
Publisher
ELSEVIER
Keywords
Energy storage materials; Synthesis design; Energy conversion; Nanostructures; Multi-shell
Citation
JOURNAL OF POWER SOURCES, v.284, pp.481 - 488
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF POWER SOURCES
Volume
284
Start Page
481
End Page
488
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/93253
DOI
10.1016/j.jpowsour.2015.03.026
ISSN
0378-7753
Abstract
Multi-shell structured binary transition metal oxide powders with a Ni/Co mole ratio of 1:2 are prepared by a simple spray drying process. Precursor powder particles prepared by spray drying from a spray solution of citric acid and ethylene glycol have completely spherical shape, fine size, and a narrow size distribution. The precursor powders turn into multi-shell powders after a post heat-treatment at temperatures between 250 and 800 degrees C. The multi-shell structured powders are formed by repeated combustion and contraction processes. The multi-shell powders have mixed crystal structures of Ni1-xCO2O4-x and NiO phases regardless of the post-treatment temperature. The reversible capacities of the powders post-treated at 250, 400, 600, and 800 degrees C after 100 cycles are 584, 913, 808, and 481 mA hg(-1), respectively. The low charge transfer resistance and high lithium ion diffusion rate of the multi-shell powders post-treated at 400 degrees C with optimum grain size result in superior electrochemical properties even at high current densities. (C) 2015 Elsevier B.V. All rights reserved.
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