On the stability of Li intercalated fine-grained graphitic material

On the stability of Li intercalated fine-grained graphitic material Full article

Journal

Carbon
ISSN: 0008-6223 , E-ISSN: 1873-3891

Output data

Year: 2021, Volume: 173, Pages: 792-799 Pages count : 8 DOI: 10.1016/j.carbon.2020.11.048

Tags

Fine-grained graphitic material; Lithium(de-)intercalation; 13C solid-State MAS NMR; X-ray photoelectron spectroscopy

Authors

Sysoev Vitalii I. ¹ , Koroteev Victor O. ¹ , Makarova Anna ² , Bulusheva Lyubov G. ¹ , Okotrub Alexander V. ¹ , Laubschat Clemens ³ , Vyalikh Anastasia ⁴

Affiliations

1	Nikolaev Institute of Inorganic Chemistry, SB RAS, 3 Acad. Lavrentiev Ave., 630090, Novosibirsk, Russia
2	Physikalische Chemie, Institut für Chemie und Biochemie, Freie Universitat Berlin, 14195, Berlin, Germany
3	Institut für Festkorper- und Materialphysik, Technische Universitat Dresden, 01062, Dresden, Germany
4	Institut für Experimentelle Physik, Technische Universitat Bergakademie Freiberg, Leipziger Str. 23, 09599, Freiberg, Germany

In order to study the performance, cycling stability and safety of electrochemical storage devices, various characterisation methods are applied. Magic angle spinning (MAS) NMR enables ex situ studies of electrochemical reactions with high resolution. In the present work, we follow the changes that occur in the MAS NMR spectra of lithiated graphitic materials after storage. The measuring time has been significantly shortened by using fine-grained graphitic material with 65% 13C-isotope enrichment. Our results show that for 13C graphitic electrode material with a low lithiation degree, visible changes in the 13C NMR spectra are observed already in few hours, whereas the samples with a higher lithiation degree demonstrated greater stability even after several days. We analyzed the deintercalation behavior in these materials using 7 Li MAS NMR and oxidation processes using in situ X-ray photoelectron spectroscopy. During storage Li ions migrate to the other interlayers (redistribution), large pores and to the surface, where interaction with air takes place. Effects of charge transfer from Li to graphite across four graphitic layers guarantees that 13C NMR spectra are less affected by these effects. The key finding is that special care has to be paid to the ex situ characterisation of electrochemically prepared graphitized materials

Sysoev V.I. , Koroteev V.O. , Makarova A. , Bulusheva L.G. , Okotrub A.V. , Laubschat C. , Vyalikh A.
On the stability of Li intercalated fine-grained graphitic material
Carbon. 2021. V.173. P.792-799. DOI: 10.1016/j.carbon.2020.11.048 WOS Scopus РИНЦ OpenAlex

Web of science:	WOS:000625347900040
Scopus:	2-s2.0-85097656012
Elibrary:	45076953
OpenAlex:	W3103359768

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