Dresden 2020 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 30: Poster Session II
MM 30.22: Poster
Tuesday, March 17, 2020, 18:15–20:00, P4
Polypyrene tetraone (PPTO) as cathode material for lithium-ion batteries — •Jonas Spychala1, Yuquan Wu1, Lucas Ueberricke3, Michael Mastalerz3, and Rüdiger Klingeler1,2 — 1Kirchhoff Institute of Physics, Heidelberg University, Germany — 2Centre for Advanced Materials, Heidelberg University, Germany — 3Organisch-Chemisches Institut, Heidelberg University, Germany
Covalent organic frameworks (COFs) have emerged as promising candidates for cathode materials in lithium-ion batteries, due to their superior conductivity, electrochemical stability and structural richness. In order to assess the feasibility of Polypyrene tetraone (PPTO) for electrochemical energy storage, we have investigated its electrochemical properties by means of cyclic voltammetry (CV), galvanostatic cycling (GCPL), and electrochemical impedance spectroscopy (EIS). Cyclic voltammetograms show two characteristic redox pairs, at 2.4 V and 2.8 V, respectively, with small overpotentials. In comparison to the monomers which capacity amounts to 70 mAhg−1 in the initial cycles, PPTO delivers significantly increased capacities of 140 mAhg−1. This indicates that higher carbonyl utilization is achieved by polymerization. The capacity retention in PPTO by cycle 10 is 96% and 70% by cycle 50. The effects of different porosities and electrode fabrication procedures are discussed.