Kontrollierte Sulfidierung und Derivatisierung von Berliner Blau Strukturen zur Erzeugung elektrochemischer stabiler Nanohybride von Metallsulfid und Kohlenstoff
Zusammenfassung der Projektergebnisse
The sharp rise in demand for batteries requires the development of more sustainable and easier to recycle battery materials, substituting costly and strategic elements like Li, Ni and Co by widely and more evenly available ones like Na and Fe in the electrode materials. Prussian blue (PB) and its analogues (PBA, AM[M’(CN)6]) are cheap, non-toxic, water and air-stable and can be entirely synthesized in water-based methods, showing a high degree of sustainability. Given PBA porous framework, they have been used as templates to prepared the so-called PB derivatives (PBD) which present a booming number of compositions including metal oxides, sulfides, carbides, hybrids, and an array of morphologies. In this work, the PBA copper ironhexacyanoferrate(II) (CuPB) is explored as precursor to produce mixed Cu/Fe sulfides for Lithium-ion battery. To control the particle size, dopamine or tannic acid are added to the system and polymerized in situ during CuPB growth. The presence of the polymers favors K-rich CuPB while the thickness of the polymer shows key-role in preventing particle coarsening during sulfidation process and enable its application in LIB, which otherwise is prohibited due to lack of structural and electrochemical stability. Through mild thermal treatment conditions (300 °C, 10 min), carbon-coated (K)CuFeS2 is produced. Standard coating with NMP and PVDF binder are explored together with greener alternatives like ethanol and PVP to process the PBD for electrochemical testing. The C-coated KCuFeS2 electrodes showed capacities up to 800 mAh/g at 10 mA/g with nearly 100% capacity recovery after rate handling and a capacity of 380 mAh/g at 250 mA/g after 500 cycles. KCuFeS2 showed to be sensitive to water and prevented the substitution of NMP with water in slurry preparation. The work demonstrates that control over PBD properties is not trivial and can be highly influenced by minor changes in PBA synthesis.
Projektbezogene Publikationen (Auswahl)
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DE 102022105543.4 Preußisch-Blau-Derivate für Energiespeicher.
Bornamehr, B.; Husmann, S. & Presser, V.
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High-capacity mixed Cu-Fe sulfides: Towards sustainable batteries with Prussian blue derivatives. 3rd International Conference on Material Science &Nanotechnology. Rome, Italy/Hybrid. 3rd – 5th October 2022.
Behnoosh Bornamehr, Sakthivigneshwaran S. Chandrasekaran & Volker Presser Samantha Husmann
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Mixed Cu–Fe Sulfides Derived from Polydopamine-Coated Prussian Blue Analogue as a Lithium-Ion Battery Electrode. ACS Omega, 7(43), 38674-38685.
Bornamehr, Behnoosh; Presser, Volker & Husmann, Samantha
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Prussian blue and its analogues as functional template materials: control of derived structure compositions and morphologies. Journal of Materials Chemistry A, 11(20), 10473-10492.
Bornamehr, Behnoosh; Presser, Volker; Zarbin, Aldo J. G.; Yamauchi, Yusuke & Husmann, Samantha
