Liu, Y;
Niu, Z;
Dai, G;
Chen, Y;
Li, H;
Huang, L;
Zhang, X;
... Zhao, Y; + view all
(2021)
Phenothiazine-based copolymer with redox functional backbones for organic battery cathode materials.
Materials Today Energy
, 21
, Article 100812. 10.1016/j.mtener.2021.100812.
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Abstract
Organic battery materials are receiving increasing attention owing to their elemental abundance, environmental sustainability, and structural diversity. Challenges including the solubility in electrolytes, moderate redox potentials and inactive molecular fragments prevent organic materials from being ideal cathodes for practical implementation. Although polymerization, salification and alike are effective in lowering the solubility in electrolytes, they unavoidably bring additional inactive fragments into the molecular structures, resulting in the sacrifice of theoretical galvanometric capacity compared with the pristine molecule. In this study, we use two redox-active fragments to construct an insoluble copolymer as a cathode material for organic batteries. The copolymer avoids the use of unnecessary molecular weight while maintaining high specific capacity and cycling stability. We find that a twisted geometry between the two redox-active fragments leads to a cross-conjugation effect that further consolidates the low stability of individual fragment and enhances the flexibility of copolymer chains by forming mesopores that accelerate ion diffusion. The copolymer shows a high capacity of 142.5 mAh g^{-1} with energy/power density of 577 Wh kg^{-1}/1685 W kg^{-1} and a decent capacity retention of 87% after 500 cycles. Our strategy demonstrates the feasibility of designing organic battery materials that are qualified for taking solubility, capacity, and stability into consideration.
| Type: | Article |
|---|---|
| Title: | Phenothiazine-based copolymer with redox functional backbones for organic battery cathode materials |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.mtener.2021.100812 |
| Publisher version: | https://doi.org/10.1016/j.mtener.2021.100812 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Organic batteries, p-type materials, Molecular design, Polymeric materials, Multi-electron redox reactive |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10130775 |
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