Designing Quinone-based Conducting Redox Polymers specifically for Aqueous Proton Batteries and for Lithium Ion Battery Cathodes

•  Conducting redox polymers (CRPs) are conducting polymers that have been decorated with redox active functional groups and they provide an attractive alternative as organic matter based electrical energy storage materials. The purpose of the polymer backbone is two-fold, 1) it prevents dissolution of the redox group and, 2) it renders the material conductive. The redox active pendant groups, on the other hand, provide the material with a well-defined redox reaction as well as a high charge storage capacity. CRPs thus provide a solution to two of the most significant obstacles in achieving powerful and stable battery materials from organic compounds, i.e. materials dissolution and limited electronic conductivity while simultaneously providing a high charge storage capacity. For battery applications it is thus essential that the individual properties of the conducting polymer backbone and the redox group can be preserved and that they operate in synergy in the CRP. One prerequisite for synergetic polymer-pendant combinations is redox matching. As conducting polymers are only conducting in their charged state successful combinations rely on that the pendant group has a redox potential within the conducting region of the polymer backbone. In addition, the CRP must allow mass transport of ions, not only related to the cycling chemistry of the pendant group but also ions related to the doping of the polymer backbone. These requirements put significantly different demands on the polymer design for the development of aqueous proton batteries and for CRPs for lithium cycling cathodes. In this presentation specific CRP design-solutions will be presented that allow for the development of all-organic proton batteries 1,2 and for lithium ion CRP-battery cathodes 3. In addition, a solution-processing method, termed Post Deposition Polymerization (PDP), for CRP-materials and the underlying principles and requirements for PDP will be presented. Importantly, in PDP the processing step occurs prior to polymerization. After depositing and drying of the repeat-unit precursor onto a substrate polymerization is achieved by oxidative polymerization of the precursor. The PDP-method opens up for a scalable method for the coating of CRP materials onto any substrate and can, for instance, be used to make nanostructured CRP materials.1              Emanuelsson, R., Sterby, M., Strømme, M. & Sjödin, M. An All-Organic Proton Battery. J. Am. Chem. Soc. 139, 4828-4834, doi:10.1021/jacs.7b00159 (2017).2              Strietzel, C. et al. Accepted in Angewandte Chemie doi:10.1002/anie.202001191 (2020).3              Wang, H. et al. Redox-State-Dependent Interplay between Pendant Group and Conducting Polymer Backbone in Quinone-Based Conducting Redox Polymers for Lithium Ion Batteries. ACS Applied Energy Materials 2, 7162-7170, doi:10.1021/acsaem.9b01130 (2019).

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Nanoteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Nano-technology (hsv//eng)

Nyckelord

Engineering Science with specialization in Nanotechnology and Functional Materials

Teknisk fysik med inriktning mot nanoteknologi och funktionella material

Publikations- och innehållstyp

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