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Osmotically Delaminated Silicate Nanosheet-Coated NCM for Ultra-Stable Li⁺ Storage and Chemical Stability Toward Long-Term Air Exposure

Title data

Stevenson, Max ; Weiß, Sebastian ; Cha, Gihoon ; Schamel, Maximilian ; Jahn, Leonard ; Friedrich, Daniel ; Danzer, Michael A. ; Cheong, Jun Young ; Breu, Josef:
Osmotically Delaminated Silicate Nanosheet-Coated NCM for Ultra-Stable Li⁺ Storage and Chemical Stability Toward Long-Term Air Exposure.
In: Small. Vol. 19 (2023) Issue 39 . - 2302617.
ISSN 1613-6829
DOI: https://doi.org/10.1002/smll.202302617

Official URL: Volltext

Abstract in another language

Abstract To ensure the safety and performance of lithium-ion batteries (LIBs), a rational design and optimization of suitable cathode materials are crucial. Lithium nickel cobalt manganese oxides (NCM) represent one of the most popular cathode materials for commercial LIBs. However, they are limited by several critical issues, such as transition metal dissolution, formation of an unstable cathode-electrolyte interphase (CEI) layer, chemical instability upon air exposure, and mechanical instability. In this work, coating fabricated by self-assembly of osmotically delaminated sodium fluorohectorite (Hec) nanosheets onto NCM (Hec-NCM) in a simple and technically benign aqueous wet-coating process is reported first. Complete wrapping of NCM by high aspect ratio (>10 000) nanosheets is enabled through an electrostatic attraction between Hec nanosheets and NCM as well as by the superior mechanical flexibility of Hec nanosheets. The coating significantly suppresses mechanical degradation while forming a multi-functional CEI layer. Consequently, Hec-NCM delivers outstanding capacity retention for 300 cycles. Furthermore, due to the exceptional gas barrier properties of the few-layer Hec-coating, the electrochemical performance of Hec-NCM is maintained even after 6 months of exposure to the ambient atmosphere. These findings suggest a new direction of significantly improving the long-term stability and activity of cathode materials by creating an artificial CEI layer.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: cathode electrolyte interface; cathode materials; Li-ion batteries; nanosheets; surface coating
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I > Chair Inorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Faculties > Faculty of Engineering Science > Chair Electrical Energy Systems > Chair Electrical Energy Systems - Univ.-Prof. Dr. Michael Danzer
Research Institutions > Central research institutes > Bayerisches Zentrum für Batterietechnik - BayBatt
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Electrical Energy Systems
Research Institutions
Research Institutions > Central research institutes
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 21 Oct 2023 21:03
Last Modified: 24 Oct 2023 08:16
URI: https://eref.uni-bayreuth.de/id/eprint/87345