Volume 13, Issue 9 pp. 2312-2320
Full Paper

Fused Tetrathiafulvalene and Benzoquinone Triads: Organic Positive-Electrode Materials Based on a Dual Redox System

Prof. Dr. Yohji Misaki

Corresponding Author

Prof. Dr. Yohji Misaki

Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577 Japan

Research Unit for Power Generation and Storage Materials, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577 Japan

Research Unit for Development of Organic Superconductors, Ehime University, 2-5 Bunkyo-cho, Matsuyama, 790-8577 Japan

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Shigenobu Noda

Shigenobu Noda

Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577 Japan

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Dr. Minami Kato

Dr. Minami Kato

Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577 Japan

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Tomokazu Yamauchi

Tomokazu Yamauchi

Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577 Japan

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Toko Oshima

Toko Oshima

Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577 Japan

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Dr. Aya Yoshimura

Dr. Aya Yoshimura

Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577 Japan

Research Unit for Development of Organic Superconductors, Ehime University, 2-5 Bunkyo-cho, Matsuyama, 790-8577 Japan

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Dr. Takashi Shirahata

Dr. Takashi Shirahata

Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577 Japan

Research Unit for Power Generation and Storage Materials, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577 Japan

Research Unit for Development of Organic Superconductors, Ehime University, 2-5 Bunkyo-cho, Matsuyama, 790-8577 Japan

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Dr. Masaru Yao

Dr. Masaru Yao

Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka, 563-8577 Japan

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First published: 25 February 2020
Citations: 24

Graphical Abstract

Accentuate the positive: Fused donor–acceptor triads composed of two tetrathiafulvalenes and benzoquinone or naphthoquinone were synthesized. Positive electrodes incorporating the unsubstituted components and their methylthio derivatives had discharge capacities of 266–299 mAh g−1, which were attributed to the formation of both reduced and oxidized states from −2 to +4. Several cells exhibited high energy densities in excess of 800 mWh g-1.

Abstract

Fused donor–acceptor triads composed of two tetrathiafulvalenes (TTFs) and benzoquinone (BQ; 1) or naphthoquinone (NQ; 2) were successfully synthesized. X-ray structure analysis of the bis(n-butylthio) derivative revealed that the molecules are stacked in a head-to-tail manner. The bis(n-hexylthio)-1 exhibited six-pairs of one-electron transfer waves in the cyclic voltammogram, corresponding to the formation of both reduction and oxidation states from −2 to +4. The unsubstituted and bis(methylthio) derivatives of 1 and 2 were active materials in positive electrodes for rechargeable batteries, several of which displayed energy densities exceeding 800 mWh g−1. The bis(methylthio)-2 also functions as a positive electrode material for a rechargeable sodium-ion battery.

Conflict of interest

The authors declare no conflict of interest.