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- Title
Irreversible Structural Changes of Copper Hexacyanoferrate Used as a Cathode in Zn‐Ion Batteries.
- Authors
Lim, Joohyun; Kasiri, Ghoncheh; Sahu, Rajib; Schweinar, Kevin; Hengge, Katharina; Raabe, Dierk; La Mantia, Fabio; Scheu, Christina
- Abstract
The structural changes of copper hexacyanoferrate (CuHCF), a Prussian blue analogue, which occur when used as a cathode in an aqueous Zn‐ion battery, are investigated using electron microscopy techniques. The evolution of ZnxCu1−xHCF phases possessing wire and cubic morphologies from initial CuHCF nanoparticles are monitored after hundreds of cycles. Irreversible introduction of Zn ions to CuHCF is revealed locally using scanning transmission electron microscopy. A substitution mechanism is proposed to explain the increasing Zn content within the cathode material while simultaneously the Cu content is lowered during Zn‐ion battery cycling. The present study demonstrates that the irreversible introduction of Zn ions is responsible for the decreasing Zn ion capacity of the CuHCF cathode in high electrolyte concentration.
- Subjects
SCANNING transmission electron microscopy; CATHODES; ELECTRIC batteries; ELECTRON energy loss spectroscopy; ELECTRON microscope techniques; AQUEOUS electrolytes
- Publication
Chemistry - A European Journal, 2020, Vol 26, Issue 22, p4917
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201905384