Journal Article

FZJ-2024-02582

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Immobilizing Poly(vinylphenothiazine) in Ketjenblack‐Based Electrodes to Access its Full Specific Capacity as Battery Electrode Material

Tengen, B. ; Winkelmann, T. ; Ortlieb, N. ; Perner, V. ; Studer, G. ; Winter, M.FZJ* ; Esser, B. ; Fischer, A. ; Bieker, P. (Corresponding author)FZJ*

2023
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/adfm.202210512  doi:10.34734/FZJ-2024-02582

Abstract: Organic batteries are considered as environmentally friendly alternative to lithium-ion batteries due to the application of transition metal-free redox-active polymers. One well-established polymer is poly(3-vinyl-N-methylphenothiazine) (PVMPT) with a fast reversibility of the electrochemical redox reaction at a potential of 3.5 V versus Li|Li+. The oxidized PVMPT is soluble in many standard battery electrolytes, which diminishes its available specific capacity but at the same time can lead to a unique charge/discharge mechanism involving a redeposition process upon discharge. Herein, the influence of different conductive carbon additives and their properties, e.g., specific surface area, pore size distribution, and electrical conductivity, on the dissolution behavior of oxidized PVMPT is investigated. Compared to the state-of-the-art conductive carbon Super C65 employed in many organic battery electrodes, Ketjenblack EC-300J and EC-600J reduce the dissolution of the oxidized PVMPT due to better immobilization on the carbon additive and in the resulting 3D structure of the electrode, as assessed by N2-physisorption, electrochemical, UV–vis spectroscopy and scanning electron microscopy investigations. The studies demonstrate that a dense packing of the carbon particles in the electrode is decisive for the stable immobilization of PVMPT while maintaining its long-term cycling performance.

Note: Zudem unterstützt durch: MEET Hi-EnD III (03XP0258A), DFG Germany’s Excellence Strategy (EXC-2193/1- 390951807, grantee A.F.)

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
2. DFG project 398214985 - Heteroaromatische Redoxpolymere für Lithium-/organische Batterien (HALO) (398214985) (398214985)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 15 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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