title: New tris- and pentakis-fused donors containing extended tetrathiafulvalenes: New positive electrode materials for rechargeable batteries.
abstract: Derivatives of tris-fused TTF extended with two ethanediylidenes (5), tris- and pentakis-fused TTFs extended with two thiophene-2,5-diylidenes (6-9) were successfully synthesized. Cyclic voltammograms of the tetrakis(n-hexylthio) derivative of 5 and 7 (5d, 7d) consisted of two pairs of two-electron redox waves and two pairs of one-electron redox waves. On the other hand, four pairs of two-electron redox waves and two pairs of one-electron redox waves were observed for the tetrakis(n-hexylthio) derivative of 9 (9d). Coin-type cells using the bis(ethylenedithio) derivatives of 5 (5b), 6 (6b) and the tetrakis(methylthio) derivatives of 5 (5c) and 8 (8c) as positive electrode materials showed initial discharge capacities of 157-190 mAh g(-1) and initial energy densities of 535-680 mAh g(-1). The discharge capacities after 40 cycles were 64-86% of the initial discharge capacities.
authors.affiliation: Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan ; Department, Molecular Engineering, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8520, Japan.
authors.forename: Shintaro
authors.initials: S
authors.lastname: Iwamoto
authors.affiliation: Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan ; Panasonic Corporation, 1006 Kadoma, Kadoma, Osaka 571-8501, Japan.
authors.forename: Yuu
authors.initials: Y
authors.lastname: Inatomi
authors.affiliation: Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Ogi
authors.affiliation: Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Shibayama
authors.affiliation: Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Murakami
authors.affiliation: Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.
authors.forename: Minami
authors.initials: M
authors.lastname: Kato
authors.affiliation: Department of Chemistry, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Takahashi
authors.affiliation: Department, Molecular Engineering, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8520, Japan.
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Tanaka
authors.affiliation: Panasonic Corporation, 1006 Kadoma, Kadoma, Osaka 571-8501, Japan.
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Hojo
authors.affiliation: Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan ; Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan.
authors.forename: Yohji
authors.initials: Y
authors.lastname: Misaki
keywords: cyclic voltammetry; positive electrode materials; rechargeable battery; redox; tetrathiafulvalene