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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Energy Storage Materials and Devices II

CPP 16.6: Vortrag

Montag, 9. März 2026, 18:45–19:00, ZEU/0260

Dual-Ion AlCl₄⁻ / AlCl₂⁺ Charge Storage Mechanism in Composite Cathode for Aluminum-Polymer Batteries — •Shuvrodev Biswas, Thomas Köhler, Amir Mohammad, Hartmut Stöcker, and Dirk C. Meyer — Institute of Experimental Physics, TU Bergakademie Freiberg, Leipziger Str. 23 09599 Freiberg, Germany

Rechargeable aluminum batteries have emerged as a promising post-lithium-ion technology. Graphite, the most widely used cathode that relies on AlCl₄⁻ intercalation, offers limited capacity, whereas organic cathodes, such as phenanthrenequinone (PQ), coordinate with AlCl₂⁺ but suffer from limited cycling stability. Here, we design a composite (SPGPQ) consisting of spherical graphite (SPG) and PQ through melt diffusion, enabling dual-ion charge storage by coupling AlCl₄⁻ intercalation with AlCl₂⁺ coordination. FTIR, XPS, in situ XRD, and cyclic voltammetry using polyamide-6 (PA6) electrolytes (SPE) provide clear evidence of this synergistic mechanism. Whereas the PA6-SPE limits capacity due to low ionic conductivity, the higher-conductivity polyacrylonitrile (PAN)-based SPE delivers improved capacity but shows limited cycling stability. To enhance stability, we further developed an ACPQ+SPG composite through solvent-assisted impregnation using activated carbon (AC). This composite features an identical mechanism to SPGPQ, while offering significantly enhanced capacity and stable long-term cycling.

Keywords: Aluminum Battery; Solid Polymer Electrolyte; Dual-Ion Exchange; Composite materials