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The effect of electrochemically inactive Ti substituted for Ru in Li2Ru1-Ti O3 on structure and electrochemical performance

Yao, Ye; Zhang, Lu; Sigel, Florian 1; Schwarz, Björn 1; Ehrenberg, Helmut 1; Chen, Gang; Du, Fei; Wang, Chunzhong
1 Karlsruher Institut für Technologie (KIT)

The approach of substituting electrochemically active with inactive elements has widely been used to improve the electrochemical performance of Li-rich intercalation cathode materials. This especially is true for Li-rich compounds where almost all of the Li$^{+}$ ions are reversibly (de)intercalated during electrochemical cycling. The beneficial mechanism behind this substitution with electrochemically inactive elements is still not clear yet. Li$_{2}$RuO$_{3}$ is chosen as basis for a model solid solution system to investigate the effect of electrochemically inactive elements owing to its high specific capacity of more than 300 mAh g$^{-1}$ and the significant contribution of anion redox mechanism. Herein, Li$_{2}$Ru$_{1-x }$Ti$_{x}$O$_{3}$ solid solution series are synthesized and the effect of substituting with electrochemical inactive Ti for Ru on structure and electrochemical performance have been comprehensively investigated. The electrochemical performance is significantly improved, especially for Li$_{2}$Ru$_{0.8}$Ti$_{0.2}$O$_{3}$, and the capacity retention after 50 cycles increases from 81% to 90%, as compared to the end member Li$_{2}$RuO$_{3}$. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000134528
Veröffentlicht am 30.06.2021
DOI: 10.1016/j.jechem.2020.12.037
Zitationen: 4
Web of Science
Zitationen: 1
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Computational Materials Science (IAM-CMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2021
Sprache Englisch
Identifikator ISSN: 2095-4956
KITopen-ID: 1000134528
Erschienen in Journal of Energy Chemistry
Verlag Elsevier
Band 60
Seiten 222–228
Schlagwörter Li2Ru1-xTixO3, Lithium ion batteries, Inactive element substitution, XRD, NMR
Nachgewiesen in Scopus
Web of Science
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