New tris- and pentakis-fused donors containing extended tetrathiafulvalenes: New positive electrode materials for rechargeable batteries
説明
<jats:p>Derivatives of tris-fused TTF extended with two ethanediylidenes (<jats:bold>5</jats:bold>), tris- and pentakis-fused TTFs extended with two thiophene-2,5-diylidenes (<jats:bold>6</jats:bold>–<jats:bold>9</jats:bold>) were successfully synthesized. Cyclic voltammograms of the tetrakis(<jats:italic>n</jats:italic>-hexylthio) derivative of <jats:bold>5</jats:bold> and <jats:bold>7</jats:bold> (<jats:bold>5d</jats:bold>, <jats:bold>7d</jats:bold>) 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(<jats:italic>n</jats:italic>-hexylthio) derivative of <jats:bold>9</jats:bold> (<jats:bold>9d</jats:bold>). Coin-type cells using the bis(ethylenedithio) derivatives of <jats:bold>5</jats:bold> (<jats:bold>5b</jats:bold>), <jats:bold>6</jats:bold> (<jats:bold>6b</jats:bold>) and the tetrakis(methylthio) derivatives of <jats:bold>5</jats:bold> (<jats:bold>5c</jats:bold>) and <jats:bold>8</jats:bold> (<jats:bold>8c</jats:bold>) as positive electrode materials showed initial discharge capacities of 157–190 mAh g<jats:sup>−1</jats:sup> and initial energy densities of 535–680 mAh g<jats:sup>−1</jats:sup>. The discharge capacities after 40 cycles were 64–86% of the initial discharge capacities.</jats:p>
収録刊行物
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- Beilstein Journal of Organic Chemistry
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Beilstein Journal of Organic Chemistry 11 1136-1147, 2015-07-08
Beilstein Institut
