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Abnormal Excess Capacity of Conjugated Dicarboxylates in Lithium-Ion Batteries
Cited 71 time in
Web of Science
Cited 71 time in Scopus
- Authors
- Issue Date
- 2014-11
- Publisher
- American Chemical Society
- Citation
- ACS Applied Materials and Interfaces, Vol.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 pi-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 C-13 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.
- ISSN
- 1944-8244
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