Controlling redox doping in conjugated polymers: from improved conductivity to next generation binders for lithium ion batteries

Sarah H. Tolbert

doi:10.1117/12.3028386

30 September 2024 Controlling redox doping in conjugated polymers: from improved conductivity to next generation binders for lithium ion batteries

Sarah H. Tolbert

Author Affiliations +

Proceedings Volume PC13127, Physical Chemistry of Semiconductor Materials and Interfaces XXIII; PC131270R (2024) https://doi.org/10.1117/12.3028386
Event: Organic Photonics + Electronics, 2024, San Diego, California, United States

Abstract

Semiconducting polymers have broad device application potential, particularly when doped, either chemically or electrochemically, to improve conductivity. Carrier mobility in doped polymers is highly variable, however, and much of that variability stems from strong electrostatic attraction between dopants and their counter-ions. Here, we first explore how polymer and dopant structure can be used to mitigate that electrostatic attraction, considering the interplay between dopant size, polymer chain packing, polymer crystallinity, and doping mechanism. We next consider applications for doped conjugated polymers, focusing on their use as binders in lithium ion batteries. Battery binders are usually chosen only for chemical inertness, but adding electronic conductivity can improve battery cycling. If polymer doping energies are matched to the electrode material, highly conductive binders can be produced. By tuning the side chains, ionic conductivity can further be mixed with electronic conductivity, both of which are needed for fast battery operation.

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Sarah H. Tolbert "Controlling redox doping in conjugated polymers: from improved conductivity to next generation binders for lithium ion batteries", Proc. SPIE PC13127, Physical Chemistry of Semiconductor Materials and Interfaces XXIII, PC131270R (30 September 2024); https://doi.org/10.1117/12.3028386

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KEYWORDS

Polymers

Electrical conductivity

Batteries

Dopants

Doping

Ions

Lithium

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