Multi-redox Molecule for High-Energy Redox Flow Batteries

Kwon, Giyun; Lee, Sechan; Hwang, Jun Gi; Shim, Hyun-Soo; Lee, Byungju; Lee, Myeong Hwan; Ko, Youngmin; Jung, Sung‐Kyun; Ku, Kyojin; Hong, Jihyun; Kang, Kisuk

doi:10.1016/j.joule.2018.05.014

Cited by 138 publications

(152 citation statements)

References 61 publications

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“…34 Several attempts have very recently been made to utilize multi-electron redox p-type ROMs as catholytes. [35][36][37] For instance, Kowalski et al demonstrated that the chemical stability of the dication state of phenothiazine-based molecules can be enhanced by introducing methoxy groups at the para positions to the nitrogen atom of the phenothiazine core. Accordingly, the second redox reaction of the phenothiazine catholyte can be utilized reversibly in a non-aqueous bulk-electrolysis cell.…”

Section: The Bigger Picturementioning

confidence: 99%

Bio-inspired Molecular Redesign of a Multi-redox Catholyte for High-Energy Non-aqueous Organic Redox Flow Batteries

Kwon

Lee

et al. 2019

Chem

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Section: The Bigger Picturementioning

confidence: 99%

Bio-inspired Molecular Redesign of a Multi-redox Catholyte for High-Energy Non-aqueous Organic Redox Flow Batteries

Kwon

Lee

et al. 2019

Chem

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“…In recent years, phenazine has been identified as a promising charge‐storage unit in battery cathodes, capacitors, and as a redox‐flow catholyte . Recent work on phenazine‐based p‐type energy materials has been led by Zhang and co‐workers, who became interested in 1 for its ability to improve charge delocalization about the dihydrophenazine unit .…”

Section: Introductionmentioning

confidence: 99%

Cross‐linking Effects on Performance Metrics of Phenazine‐Based Polymer Cathodes

et al. 2020

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Developing cathodes that can support high charge–discharge rates would improve the power density of lithium‐ion batteries. Herein, the development of high‐power cathodes without sacrificing energy density is reported. N,N′‐diphenylphenazine was identified as a promising charge‐storage center by electrochemical studies due to its reversible, fast electron transfer at high potentials. By incorporating the phenazine redox units in a cross‐linked network, a high‐capacity (223 mA h g−1), high‐voltage (3.45 V vs. Li/Li+) cathode material was achieved. Optimized cross‐linked materials are able to deliver reversible capacities as high as 220 mA h g−1 at 120 C with minimal degradation over 1000 cycles. The work presented herein highlights the fast ionic transport and rate capabilities of amorphous organic materials and demonstrates their potential as materials with high energy and power density for next‐generation electrical energy‐storage technologies.

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“…The redox potential of the electrode materials is a key property of cathode materials. In previous investigations, p‐type N‐heterocyclic‐ring‐based organic compounds such as dihydrophenazine and phenothiazine have been synthesized and applied as cathode materials. These materials typically possess a higher discharge voltage than n‐type materials but barely exceed 3.5 V vs. Li + /Li .…”

Section: Introductionmentioning

confidence: 99%

Dilution of the Electron Density in the π‐Conjugated Skeleton of Organic Cathode Materials Improves the Discharge Voltage

et al. 2020

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Organic compounds are promising candidates as battery materials because they can be sourced from sustainable resources, have tunable structures, and are cheap. However, the working voltage of battery cells containing organic compounds as positive electrodes is relatively lower than that of those containing an inorganic counterpart. In this work, a strategy was developed to increase the discharge voltage of battery cells by diluting the electron density of N‐based redox centers in conjugated organic materials. In electron‐rich heterocyclic compounds that utilize N as the redox center, pentatomic rings such as carbazole derivatives exhibited a higher atomic‐dipole‐moment‐corrected Hirshfeld charge population compared with hexatomic rings, which led to a significant increase in the oxidation potential. As a result, polymeric indolocarbazole derivatives showed a high discharge voltage of 3.7–4.3 V vs. Li+/Li and good cycling performance. Such a strategy can be used to design high‐voltage organic electrode materials containing other redox centers.

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Multi-redox Molecule for High-Energy Redox Flow Batteries

Cited by 138 publications

References 61 publications

Bio-inspired Molecular Redesign of a Multi-redox Catholyte for High-Energy Non-aqueous Organic Redox Flow Batteries

Bio-inspired Molecular Redesign of a Multi-redox Catholyte for High-Energy Non-aqueous Organic Redox Flow Batteries

Cross‐linking Effects on Performance Metrics of Phenazine‐Based Polymer Cathodes

Dilution of the Electron Density in the π‐Conjugated Skeleton of Organic Cathode Materials Improves the Discharge Voltage

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