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Mechanistic studies of transition metal-terephthalate coordination complexes upon electrochemical lithiation and delithiation

Cited 45 time in Web of Science Cited 45 time in Scopus
Authors
Lee, Hyun Ho; Park, Yuwon; Kim, Su Hwan; Yeon, Sun-Hwa; Kwak, Sang Kyu; Lee, Kyu Tae; Hong, Sung You
Issue Date
2015-08
Citation
Advanced Functional Materials, Vol.25 No.30, pp.4859-4866
Keywords
batteriesmultielectron redoxorganic electrode materialsreaction mechanisms
Abstract
Redox-active organic molecules are intriguing candidates as active electrode materials for next-generation rechargeable batteries due to their structural diversity, environmental friendliness, and solution-phase preparation processes. Recently, a transition metal-organic coordination approach is exploited to construct high capacity anodes for lithium-ion rechargeable batteries. Here, a family of transition metal-organic coordination complexes with terephthalate ligands is synthesized that exhibit reversible capacities above 1100 mA h g(-1). The reaction mechanism to describe the multi-electron redox processes is investigated at the molecular-level via the synchrotron-sourced X-ray absorption spectroscopy and solid-state NMR analyses. The spectroscopic studies reveal that the electrochemical process involves oxidation state changes of the transition metals followed by additional lithium insertion/extraction in the conjugated aromatic ligands. The combined approaches assisted by synthetic organic chemistry and solid-state analysis provide mechanistic insights into excessive lithiation processes that have implications for the design of high-performance anode materials.
ISSN
1616-301X
URI
https://hdl.handle.net/10371/171858
DOI
https://doi.org/10.1002/adfm.201501436
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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