A Highly Concentrated Catholyte Enabled by a Low-Melting-Point Ferrocene Derivative
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AbstractNonaqueous redox flow batteries (NRFBs) exhibit a wide potential window (>3.0 V) but have been limited by the low solubility of the active materials. Here, we propose and demonstrate a high-energy-densitynonaqueous redox flow battery based on a low melting-point (37-40 degrees C) ferrocene derivative, 1,1-dimethylferrocene (DMFc), operated at its liquid state. The liquid redox-active DMFc not only contributes to high capacity but also acts as a solvating medium to the ion-conducting salts. Taking advantage of DMFc's high concentration (3 M), superior stability, and fast kinetics, the lithium/DMFc battery achieves a high volumetric density (similar to 68 Ah I catholytc) with a high Coulombic efficiency (>95%) and high cycling stability. Our work demonstrates that exploiting a low-melting point redox-active species at its melting state is a promising direction for developing high-energy-density NRFBs for next-generation energy storage technologies.
Acceptance Date15/03/2017
All Author(s) ListGuangtao Cong, Yucun Zhou, Zhejun Li, Yi-Chun Lu
Journal nameACS Energy Letters
Volume Number2
Issue Number4
Pages869 - 875
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesChemistry, Physical;Electrochemistry;Energy & Fuels;Nanoscience & Nanotechnology;Materials Science, Multidisciplinary;Chemistry;Electrochemistry;Energy & Fuels;Science & Technology - Other Topics;Materials Science

Last updated on 2021-18-01 at 01:35