Atomic-Scale Observations of (010) LiFePO4 Surfaces Before and After Chemical Delithiation

Kobayashi, Shunsuke; Craig A. J.  Fisher; Takeharu Kato; Yoshio Ukyo; Tsukasa Hirayama; Yuichi Ikuhara

doi:10.51094/jxiv.5137

##article.authors##

Kobayashi, Shunsuke Japan Fine Ceramics Center
Craig A. J. Fisher Japan Fine Ceramics Center
Takeharu Kato Japan Fine Ceramics Center
Yoshio Ukyo Kyoto University
Tsukasa Hirayama Japan Fine Ceramics Center
Yuichi Ikuhara The University of Tokyo

DOI:

https://doi.org/10.51094/jxiv.5137

キーワード:

Lithium iron phosphate、 scanning transmission electron microscopy、 surface structure、 delithiation、 single crystal

抄録

The ability to view directly the surface structures of battery materials with atomic resolution promises to dramatically improve our understanding of lithium (de)intercalation and related processes. Here we report the use of state-of-the-art scanning transmission electron microscopy techniques to probe the (010) surface of commercially important material LiFePO₄, and compare the results with theoretical models. The surface structure is noticeably different depending on whether Li ions are present in the topmost surface layer or not. Li ions are also found to migrate back to surface regions from within the crystal relatively quickly after partial delithiation, demonstrating the facile nature of Li transport in the [010] direction. The results are consistent with phase transformation models involving metastable phase formation and relaxation, providing atomic-level insights into these fundamental processes.

利益相反に関する開示

The authors declare no competing financial interest.

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