Dissolution loss is the biggest issue for the organic electrode material, and nowadays the most popular strategy is to synthesize polymer or add much conductive carbon. In this paper, the issue is well addressed by monomolecular organics with relatively longer chain and larger size. Dye composing of quinones and carbazoles is proposed as the cathode material for Li secondary battery. The unique structure of more than three quinones collecting by carbazole bridge bond significantly improves the cycling stability. On the other hand, in addition to the widely-known enolization reaction of the quinone moiety, extra anion-doping capacity is supplied by the carbazole moiety. Owing to the multiple active sites, multi-electrons transfer redox and remarkable capacity enhancement is realized by Vet Yellow 3RT dye material. It shows stable capacity up to 340 mAh g-1 within 300 cycles. XRD, XPS and electrochemical measurement confirm the reactivity of carbonyl group and N-heterocycle toward Li+ and PF6- respectively. The work not only uncovers the new application of dye material, it also provides new avenue to address the dissolution loss and capacity breakthrough of the organics.© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Single Molecule Dye Organics with Multi-electrons Redox as Cathode Material for Li Battery.
