Publication Date:
2015-07-09
Description:
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. Beilstein J. Org. Chem. 2015, 11, 1136–1147. doi:10.3762/bjoc.11.128
Keywords:
cyclic voltammetrypositive electrode materialsrechargeable batteryredoxtetrathiafulvalene
Electronic ISSN:
1860-5397
Topics:
Chemistry and Pharmacology