1. Redox-active conductive metal–organic framework with high lithium capacities at low temperatures.
- Author
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Kumar, Yogendra, Kim, Tae Hyeong, Subiyanto, Iyan, Devina, Winda, Byun, Segi, Nandy, Subhajit, Chae, Keun Hwa, Lim, Suim, Kim, Bumjin, Kang, Sanghui, Han, Seong Ok, Yim, Kanghoon, Yoo, Jungjoon, and Kim, Hyunuk
- Abstract
Lithium-ion batteries suffer from reduced capacities and stabilities at low temperature due to poor Li intercalation to the graphite anode. Graphite has a high activation energy (∼0.6 eV) to accommodate Li ions, resulting in a substantial capacity drop at low temperatures. Additionally, it can induce the formation of Li dendrites on the surface of graphite. To address this issue, we designed and synthesized a redox-active fluorothianthrene-based MOF (SKIER-5). SKIER-5, which undergoes three-electron redox reactions resulting from the fluorothianthrene-based organic ligand and Ni, exhibited excellent electrochemical performance at various temperatures when used as an anode. In particular, the discharge capacities of SKIER-5 were significantly higher than those of commercial graphite at low temperatures (<−10 °C) because of the lower activation energy (∼0.23 eV) for charge transfer. Moreover, it maintained stability when cycled at −20 °C, highlighting its potential as a promising anode material in low-temperature environments. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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