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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: KFM Poster Session

KFM 9.3: Poster

Montag, 18. März 2024, 18:00–20:00, Poster E

High-performance rechargeable Na ion batteries based on berlin green cathode materials — •Ping Hong, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Prussian blue analogs (PBAs) are considered as promising carrier frameworks owing to their low cost and well-defined ion diffusion channels. And among them, Berlin Green (BG), distinguished by its ideal cathode plateau and unique framework structure has, has been extensively investigated. It can limit its cycle stability and rate performance in batteries. Thus, researchers solved this issue by adding various chelating agents to the synthesis process. Despite the successful synthesis of low-defect BG, the method's low yield and challenging washing conditions are not beneficial for practical applications. Therefore, in this work, a simple one-step precipitation method was used to synthesize BG without the addition of any chelating agent. Synthesized cathode materials exhibit remarkable electrochemical properties. At a current density of 1 A/g, the capacity maintains at approximately 100 mAh/g in sodium-ion batteries. This research emphasizes that making simple adjustments to the synthesis process can significantly reduce the defects of cubic BG. This enables the preparation of cathode materials with excellent rate performance and cycle life, eliminating the necessity for any costly and complex treatment processes.

Keywords: Na ion battery; Prussian blue analogs; Cathode