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Titanium activation in prussian blue based electrodes for Na-ion batteries: A synthesis and electrochemical study

Li, Min; Mullaliu, Angelo; Passerini, Stefano; Giorgetti, Marco

Sodium titanium hexacyanoferrate (TiHCF, Na$_{0.86}$0 Ti$_{0.73 }$ [Fe(CN)$_{6}$]·3H$_{2}$O) is synthesized by a simple co-precipitation method in this study. Its crystal structure, chemical composition, and geometric/electronic structural information are investigated by X-ray powder diffraction (XRPD), microwave plasma-atomic emission spectroscopy (MP-AES), and X-ray absorption spectroscopy (XAS). The electroactivity of TiHCF as a host for Li-ion and Na-ion batteries is studied in organic electrolytes. The results demonstrate that TiHCF is a good positive electrode material for both Li-ion and Na-ion batteries. Surprisingly, however, the material shows better electrochemical performance as a Na-ion host, offering a capacity of 74 mAh g$^{-1}$ at C/20 and a 94.5% retention after 50 cycles. This is due to the activation of Ti towards the redox reaction, making TiHCF a good candidate electrode material for Na-ion batteries.

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Verlagsausgabe §
DOI: 10.5445/IR/1000129832
Veröffentlicht am 05.03.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2313-0105
KITopen-ID: 1000129832
Erschienen in Batteries
Verlag MDPI
Band 7
Heft 1
Seiten 1-11
Schlagwörter titanium hexacyanoferrate; cathode material; Na/Li-ion batteries
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