Flexible, Self-Supported Anode for Organic Batteries with a Matched Hierarchical Current Collector System for Boosted Current Density.

Autor: Beladi-Mousavi SM; Institute of Chemistry of New Materials, Center of Physics and Chemistry of New Materials, University of Osnabrück, Barbarastr. 7, D-49069, Osnabrück, Germany., Klein J; Institute of Chemistry of New Materials, Center of Physics and Chemistry of New Materials, University of Osnabrück, Barbarastr. 7, D-49069, Osnabrück, Germany., Ciobanu M; Institute of Chemistry of New Materials, Center of Physics and Chemistry of New Materials, University of Osnabrück, Barbarastr. 7, D-49069, Osnabrück, Germany., Sadaf S; Institute of Chemistry of New Materials, Center of Physics and Chemistry of New Materials, University of Osnabrück, Barbarastr. 7, D-49069, Osnabrück, Germany., Mahmood AM; Institute of Chemistry of New Materials, Center of Physics and Chemistry of New Materials, University of Osnabrück, Barbarastr. 7, D-49069, Osnabrück, Germany., Walder L; Institute of Chemistry of New Materials, Center of Physics and Chemistry of New Materials, University of Osnabrück, Barbarastr. 7, D-49069, Osnabrück, Germany.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2021 Dec; Vol. 17 (50), pp. e2103885. Date of Electronic Publication: 2021 Oct 14.
DOI: 10.1002/smll.202103885
Abstrakt: The inherent flexibility of redox-active organic polymers and carbon-based fillers, combined with flexible current collectors (CCs) is ideal for the fabrication of flexible batteries. Herein, a one-step electrophoretic deposition of polyviologen (PV)/graphene-oxide (GO) aqueous composites onto a flexible mesh of 60 µm thick wires, 100 µm apart, is described. Notably, during electrodeposition, GO is transformed into conductive reduced GO (rGO), and nanoscopic pores are formed by self-assembly allowing charge/discharge of the redox sites over dozens of micrometers. Typically, electrodeposition of PV alone on a flat CC (FCC) is limited by its electrically insulating structure to ≈0.15 mAh cm -2 , but the presence of rGO allows thicker active layers without loss in (dis-)charging kinetics and reaching areal capacities of ≈2 mAh cm -2 . Remarkably, when the FCC is replaced by a mesh, the deposition of significantly more anode materials (≈5 mAh cm -2 ) is possible, while the (dis-)charging kinetics is considerably improved. It exhibits high capacity retention at an ultrafast rate of 100 C (<3%) and excellent bending stabilities. This represents the first combination of a microscopic-CC (mesh wires) with a molecular-electronic and -ionic conductor (rGO with its pores), i.e., a hierarchical-CC system with maximized polymer thickness and minimized wire thickness. The stacking of such modified grids paves the road to further increase the areal capacity.
(© 2021 The Authors. Small published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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