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One-Pot Synthesis of ZnAl Double Hydroxide Powders and Their Calcined Oxide Composites for Lithium-Ion Battery Applications

Title
One-Pot Synthesis of ZnAl Double Hydroxide Powders and Their Calcined Oxide Composites for Lithium-Ion Battery Applications
Authors
Jung, Young MinKim, Jae HyeonBaek, Seong Ho
DGIST Authors
Kim, Jae HyeonBaek, Seong Ho
Issue Date
2017-10
Citation
Science of Advanced Materials, 9(10), 1801-1805
Type
Article
Article Type
Article
Keywords
ZnAl LDHAnode MaterialLithium-Ion BatteryMixed Metal OxideCarbonCoatingLayered Double HydroxideMixed-Metal OxidesAlNanocompositesElectrodesNanostructuresIntercalationPerformanceMechanismSilicon
ISSN
1947-2935
Abstract
In this work, we introduce a process for facile synthesis of ZnAl layered double hydroxide (LDH) powders and their calcined oxide composites for use in energy storage applications. First, Zn2++ cations are isomorphously substituted by Al3+ cations, then ZnAl LDH structures are obtained using a hydrothermal method. Subsequently, ZnAl LDH powders are calcined under argon gas to create Li-ion battery anode materials. After thermal decomposition, ZnAl LDH structures are changed into nanoporous ZnO/ZnAl2O4 mixed metal oxides (MMO), which retain the plate-like structures of ZnAl LDH. To evaluate the electrochemical properties of ZnO/ZnAl2O4 MMO for Li-ion battery applications, a galvanostatic lithiation-delithiation test is applied to the coin-type half cells. Moreover, carbon-coating was introduced on MMO composites to improve their poor electrical conductivity. We found that the electrochemical performances of carbon-coated ZnO/ZnAl2O4 MMO composites were greatly improved by the enhanced electrical conductivity, compared to pristine MMO powders, as confirmed by the electrochemical impedance spectroscopy. © 2017 by American Scientific Publishers.
URI
http://hdl.handle.net/20.500.11750/5641
DOI
10.1166/sam.2017.2807
Publisher
American Scientific Publishers
Related Researcher
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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