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Dibenzo[ a , e ]Cyclooctatetraene‐Functionalized Polymers as Potential Battery Electrode Materials
Author(s) -
Desmaizieres Gauthier,
Speer Martin E.,
Thiede Inna,
Gaiser Philipp,
Perner Verena,
Kolek Martin,
Bieker Peter,
Winter Martin,
Esser Birgit
Publication year - 2021
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202000725
Subject(s) - cyclooctatetraene , polymer , cyclic voltammetry , electrode , redox , materials science , organic radical battery , battery (electricity) , electrochemistry , nanotechnology , conductive polymer , chemical engineering , polymer chemistry , chemistry , organic chemistry , molecule , composite material , power (physics) , physics , quantum mechanics , engineering , metallurgy
Organic redox polymers are attractive electrode materials for more sustainable rechargeable batteries. To obtain full‐organic cells with high operating voltages, redox polymers with low potentials (<2 V versus Li|Li + ) are required for the negative electrode. Dibenzo[ a , e ]cyclooctatetraene (DBCOT) is a promising redox‐active group in this respect, since it can be reversibly reduced in a two‐electron process at potentials below 1 V versus Li|Li + . Upon reduction, its conformation changes from tub‐shaped to planar, rendering DBCOT‐based polymers also of interest to molecular actuators. Here, the syntheses of three aliphatic DBCOT‐polymers and their electrochemical properties are presented. For this, a viable three‐step synthetic route to 2‐bromo‐functionalized DBCOT as polymer precursor is developed. Cyclic voltammetry (CV) measurements in solution and of thin films of the DBCOT‐polymers demonstrate their potential as battery electrode materials. Half‐cell measurements in batteries show pseudo capacitive behavior with Faradaic contributions, which demonstrate that electrode composition and fabrication will play an important role in the future to release the full redox activity of the DBCOT polymers.