期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 21, 页码 19118-19126出版社
AMER CHEMICAL SOC
DOI: 10.1021/am505090p
关键词
lithium-ion batteries; organic electrode materials; anodes; excess capacity
资金
- Korea Institute of Energy and Research (KIER) [B4-2424]
- National Research Foundation of Korea [NRF-2013R1A1A2060695]
- MSIP (Ministry of Science, ICT & Future Planning), Korea, under the C-ITRC (Convergence Information Technology Research Center) support program [NIPA-2013-H0301-13-1009]
- Korea Electrotechnology Research Institute (KERI) Primary research program through the National Research Council of Science & Technology - Ministry of Science, ICT and Future Planning (MSIP) [14-12-N0101-69]
- National Research Council of Science & Technology (NST), Republic of Korea [14-12-N0101-69] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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