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Reducing Capacity and Voltage Decay of Co-Free Li1.2Ni0.2Mn0.6O2 as Positive Electrode Material for Lithium Batteries Employing an Ionic Liquid-Based Electrolyte

Wu, F.; Kim, G.-T.; Diemant, T.; Kuenzel, M.; Schür, A. R.; Gao, X.; Qin, B.; Alwast, D.; Jusys, Z.; Behm, R. J.; Geiger, D.; Kaiser, U.; Passerini, S.

Abstract:
Lithium‐rich layered oxides (LRLOs) exhibit specific capacities above 250 mAh g$^{-1}$, i.e., higher than any of the commercially employed lithium‐ion‐positive electrode materials. Such high capacities result in high specific energies, meeting the tough requirements for electric vehicle applications. However, LRLOs generally suffer from severe capacity and voltage fading, originating from undesired structural transformations during cycling. Herein, the eco‐friendly, cobalt‐free Li$_{1.2}$Ni$_{0.2}$Mn$_{0.6}$O$_{2}$ (LRNM), offering a specific energy above 800 Wh kg$^{-1}$ at 0.1 C, is investigated in combination with a lithium metal anode and a room temperature ionic liquid‐based electrolyte, i.e., lithium bis(trifluoromethanesulfonyl)imide and N‐butyl‐N‐methylpyrrolidinium bis(fluorosulfonyl)imide. As evidenced by electrochemical performance and high‐resolution transmission electron microscopy, X‐ray photoelectron spectroscopy, and online differential electrochemical mass spectrometry characterization, this electrolyte is capable of suppressing the structural transformation of the positive electrode material, resulting in enhanced cycling stability compared to conventional carbonate‐based electrolytes. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000122979
Veröffentlicht am 11.09.2020
Originalveröffentlichung
DOI: 10.1002/aenm.202001830
Scopus
Zitationen: 1
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Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 08.09.2020
Sprache Englisch
Identifikator ISSN: 1614-6832, 1614-6840
KITopen-ID: 1000122979
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in Advanced energy materials
Verlag Wiley-VCH Verlag
Band 10
Heft 34
Seiten Art. Nr.: 2001830
Vorab online veröffentlicht am 23.07.2020
Nachgewiesen in Web of Science
Scopus
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