Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
1 PublicationIn-situ TEM investigation of the lithiation and delithiation process between graphene sheets in the presence of atomic defects
Li, Y.; Börrnert, F.; Ghorbani Asl, M.; Biskupek, J.; Zhang, X.; Zhang, Y.; Bresser, D.; Krasheninnikov, A.; Kaiser, U.
Abstract
Using advanced in situ transmission electron microscopy, we study the lithiation and delithiation processes into graphene sheets and detect significant differences in the structural evolution of the system. Thin fcc lithium crystals with faceted shapes are formed between
graphene sheets during lithiation, but are transformed into irregular patches during delithiation. We find that defects such as vacancies in graphene and impurity atoms play the key role in these processes. Specifically, during intercalation the lithium crystals nucleate at vacancies in graphene, while upon delithiation the impurity oxygen atoms initially embedded at octahedral interstitial positions inside the lithium crystals agglomerate at the edges of the crystals, thus giving rise to the formation of amorphous lithium oxide patches, where lithium ions are trapped.
Keywords: lithiation and delithiation; graphene; defects; transmission electron microscopy; DFT calculations
Involved research facilities
- Ion Beam Center DOI: 10.17815/jlsrf-3-159
Related publications
- DOI: 10.17815/jlsrf-3-159 is cited by this (Id 39315) publication
-
Advanced Functional Materials (2024)
DOI: 10.1002/adfm.202406034
Permalink: https://www.hzdr.de/publications/Publ-39315
Years: 2023 2022 2021 2020 2019 2018 2017 2016 2015