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Synthesis and Characterization of a Multication Doped Mn Spinel, LiNi$_{0.3}$Cu$_{0.1}$Fe$_{0.2}$Mn$_{1.4}$O$_{4}$, as 5 V Positive Electrode Material

Sharma, Priyanka; Das, Chittaranjan; Indris, Sylvio; Bergfeldt, Thomas; Mereacre, Liuda; Knapp, Michael; Geckle, Udo; Ehrenberg, Helmut; Darma, Mariyam Susana Dewi

The suitability of multication doping to stabilize the disordered Fd3̅m structure in a spinel is reported here. In this work, LiNi$_{0.3}$Cu$_{0.1}$Fe$_{0.2}$Mn$_{1.4}$O$_{4}$ was synthesized via a sol–gel route at a calcination temperature of 850 °C. LiNi$_{0.3}$Cu$_{0.1}$Fe$_{0.2}$Mn$_{1.4}$O$_{4}$ is evaluated as positive electrode material in a voltage range between 3.5 and 5.3 V (vs Li$^{+}$/Li) with an initial specific discharge capacity of 126 mAh g$^{-1}$ at a rate of C/2. This material shows good cycling stability with a capacity retention of 89% after 200 cycles and an excellent rate capability with the discharge capacity reaching 78 mAh g$^{-1}$ at a rate of 20C. In operando X-ray diffraction (XRD) measurements with a laboratory X-ray source between 3.5 and 5.3 V at a rate of C/10 reveal that the (de)lithiation occurs via a solid-solution mechanism where a local variation of lithium content is observed. A simplified estimation based on the in operando XRD analysis suggests that around 17–31 mAh g$^{-1}$ of discharge capacity in the first cycle is used for a reductive parasitic reaction, hindering a full lithiation of the positive electrode at the end of the first discharge.

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Verlagsausgabe §
DOI: 10.5445/IR/1000125927
Veröffentlicht am 10.11.2020
DOI: 10.1021/acsomega.0c02174
Zitationen: 1
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2020
Sprache Englisch
Identifikator ISSN: 2470-1343, 2470-1343
KITopen-ID: 1000125927
Erschienen in ACS omega
Band 5
Heft 36
Seiten 22861–22873
Vorab online veröffentlicht am 31.08.2020
Nachgewiesen in Scopus
Web of Science
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