Preparation and characterization of binder-free electrodes based on PEDOT and perovskites type La(1-x)SrxMnO3 for use in supercapacitors

Positive electrodes for pseudocapacitators are commonly assembled with a pseudocapacitive material, an electrically conductive material, and a binder. Generally, binders present high electrical resistance, shown as losses in the electrode efficiency. Therefore, there is a need to develop new electro...

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Bibliographic Details
Published in:Journal of solid state electrochemistry 2023-11, Vol.27 (11), p.3149-3162
Main Authors: Rocha, J. E. Ruíz, Calzonci, D. M. López, Soto, C. L. Gaona, Gámez, J. A. Lara, Ferrer, J. S. Jaime, Granados, S. Gutiérrez
Format: Article
Language:English
Subjects:
Analytical Chemistry
Capacitance
Characterization and Evaluation of Materials
Charge efficiency
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Conducting polymers
Discharge
Electrical conduction
Electrochemistry
Electrode materials
Electrodes
Energy Storage
Lanthanum compounds
Original Paper
Perovskites
Physical Chemistry
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Summary:Positive electrodes for pseudocapacitators are commonly assembled with a pseudocapacitive material, an electrically conductive material, and a binder. Generally, binders present high electrical resistance, shown as losses in the electrode efficiency. Therefore, there is a need to develop new electrode materials with better electrical conduction properties. This paper proposes to replace the classical electrical binder-conductor system, in La0.7Sr0.3MnO3 (LSMO) and LaMnO3 (LMO) pseudocapacitive electrodes, with the Poly(3,4-ethylenedioxythiophene) PEDOT, a polymer with the double function of conductivity and binding. In this work, different LSMO and LMO electrode materials with PEDOT were synthesized by cyclic voltammetry at different ratios (5, 10, 15, 20, 30% wt ) of pseudocapacitive material with respect to the conductive polymer. The LSMO/PEDOT type materials with a ratio of 15% wt showed the highest capacitance with a value around 116 F/g. Also, a high stability material was obtained as shown in charge–discharge curves, with efficiencies of 94% at 272 mA/s∙g discharge current cycles. Additionally, a cyclability test was performed with 5000 cycles showing a coulombic efficiency of 87% and only 10% of capacitance loss.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-023-05450-9