KIT | KIT-Bibliothek | Impressum | Datenschutz

Phase Transformation Behavior and Stability of LiNiO$_{2}$ Cathode Material for Li-Ion Batteries Obtained from In Situ Gas Analysis and Operando X-Ray Diffraction

Biasi, Lea de  1,2; Schiele, Alexander 1,2; Roca-Ayats, Maria 1,2; Garcia, Grecia 1,2; Brezesinski, Torsten ORCID iD icon 1,2; Hartmann, Pascal 1,2; Janek, Jürgen 1,2
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
2 Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST), Karlsruher Institut für Technologie (KIT)

Abstract:

Ni-rich layered oxide cathode materials, in particular the end member LiNiO$_{2}$, suffer from drawbacks such as high surface reactivity and severe structural changes during de-/lithiation, leading to accelerated degradation and limiting practical implementation of these otherwise highly promising electrode materials in Li-ion batteries. Among all known phase transformations occurring in LiNiO$_{2}$, the one from the H2 phase to the H3 phase at high state of charge is believed to have the most detrimental impact on the material’s stability. In this work, the multistep phase transformation process and associated effects are analyzed by galvanostatic cycling, operando X-ray diffraction, and in situ pressure and gas analysis. The combined results provide thorough insights into the structural changes and how they affect the stability of LiNiO$_{2}$. During the H2–H3 transformation, the most significant change occurs in the c-lattice parameter, resulting in large mechanical stress in LiNiO$_{2}$. As for electrochemical stability, it suffers strongly in the H3 region. Oxygen evolution is observed not only during charge but also during discharge and found to be correlated with the presence of the H2 and H3 phases. ... mehr


Postprint §
DOI: 10.5445/IR/1000094300
Veröffentlicht am 20.10.2022
Originalveröffentlichung
DOI: 10.1002/cssc.201900032
Scopus
Zitationen: 145
Web of Science
Zitationen: 135
Dimensions
Zitationen: 148
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 1864-5631, 1864-564X
KITopen-ID: 1000094300
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in ChemSusChem
Verlag Wiley-VCH Verlag
Band 12
Heft 10
Seiten 2240-2250
Vorab online veröffentlicht am 04.04.2019
Nachgewiesen in Scopus
Dimensions
Web of Science
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page