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Hong, Sung You
Synthetic Organic Chemistry Laboratory
Research Interests
  • Synthetic organic chemistry, transition metals, oxidation state

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Abnormal Excess Capacity of Conjugated Dicarboxylates in Lithium-Ion Batteries

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Title
Abnormal Excess Capacity of Conjugated Dicarboxylates in Lithium-Ion Batteries
Author
Lee, Hyun HoPark, YuwonShin, Kyoung-HeeLee, Kyu TaeHong, Sung You
Issue Date
2014-10
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.6, no.21, pp.19118 - 19126
Abstract
Lithium-ion batteries (LIBs) are considered to be key energy storage systems needed to secure reliable, sustainable, and clean energy sources. Redox-active organic compounds have been proposed as interesting candidates for electrode materials for the next-generation LIBs because of their flexible molecular design, recyclability, and low production cost. Despite wide interest, a molecular-level understanding of the electrochemical lithiations/delithiations of those materials remains rudimentary. We synthesized a set of π-conjugated dicarboxylates and discovered unprecedented excess capacities for inverse-Wurster-type nonfused aromatic compounds (dilithium terephthalate and dilithium thiophene-2,5-dicarboxylate). Molecular structural investigations based on solid-state CP/MAS 13C NMR combined with the stable isotope labeling method and ex situ X-ray diffraction were carried out to elucidate the origin of the excess reversible capacity. Interestingly, an open-chain-type dilithium muconate did not show an analogous behavior, signifying the key role played by the cyclic moiety in the electrochemical reaction.
URI
https://scholarworks.unist.ac.kr/handle/201301/9201
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84910151454
DOI
10.1021/am505090p
ISSN
1944-8244
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