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Exploring the Ni redox activity in polyanionic compounds as conceivable high potential cathodes for Na rechargeable batteries

Zhang, Huang; Hasa, Ivana; Buchholz, Daniel; Qin, Bingsheng; Geiger, Dorin; Jeong, Sangsik; Kaiser, Ute; Passerini, Stefano

Although nickel-based polyanionic compounds are expected to exhibit a high operating voltage for batteries based on the Ni2+/3+ redox couple activity, some rare experimental studies on the electrochemical performance of these materials are reported, resulting from the poor kinetics of the bulk materials in both Li and Na nonaqueous systems. Herein, the electrochemical activity of the Ni2+/3+ redox couple in the mixed-polyanionic framework Na4Ni3(PO4)2(P2O7) is reported for the first time. This novel material exhibits a remarkably high operating voltage when cycled in sodium cells in both carbonate- and ionic liquid-based electrolytes. The application of a carbon coating and the use of an ionic liquid-based electrolyte enable the reversible sodium ion (de-)insertion in the host structure accompanied by the redox activity of Ni2+/3+ at operating voltages as high as 4.8 V vs Na/Na+. These results present the realization of Ni-based mixed polyanionic compounds with improved electrochemical activity and pave the way for the discovery of new Na-based high potential cathode materials.

Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1038/am.2017.41
ISSN: 1884-4057, 1884-4049
URN: urn:nbn:de:swb:90-710006
KITopen ID: 1000071000
HGF-Programm 37.01.01; LK 01
Erschienen in NPG Asia Materials
Band 9
Seiten Art. Nr.: e370
Lizenz CC BY 4.0: Creative Commons Namensnennung 4.0 International
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