Tris‐Fused Tetrathiafulvalenes Extended with an Anthraquinoid Spacer as New Positive Electrode Materials for Rechargeable Batteries

Abstract

Tris‐fused π‐electron donors composed of two tetrathiafulvalenes (TTFs) and one extended TTF with anthraquinoid spacer ( 3 ) were successfully synthesized. The cyclic voltammograms of the tetrakis( n ‐hexylthio)‐ and bis(ethylenedioxy) derivatives 3c and 3d consisted of three‐pairs of two‐electron redox waves. Spectroelectrochemitry of 3c indicated that two positive charges in 3c 2+ are located mainly on the central extended TTF moiety. Coin‐type cells composed of the positive electrodes incorporating the unsubstituted‐ 3 ( 3a ) and 3d showed the discharge capacities of 192 and 160 mAh g –1 , respectively, in which six electrons per molecule are involved.