Surface chemical heterogeneous distribution in over-lithiated Li1+xCoO2 electrodes

Gang Sun, Fu-Da Yu, Mi Lu, Qingjun Zhu, Yunshan Jiang, Yongzhi Mao, John A. McLeod, Jason Maley, Jian Wang (), Jigang Zhou () and Zhenbo Wang ()
Additional contact information
Gang Sun: Shenzhen University
Fu-Da Yu: Huaqiao University
Mi Lu: Xiamen University of Technology
Qingjun Zhu: Shenzhen University
Yunshan Jiang: School of Chemistry and Chemical Engineering, Harbin Institute of Technology
Yongzhi Mao: School of Chemistry and Chemical Engineering, Harbin Institute of Technology
John A. McLeod: Western University
Jason Maley: University of Saskatchewan
Jian Wang: University of Saskatchewan
Jigang Zhou: University of Saskatchewan
Zhenbo Wang: Shenzhen University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract In commercial Li-ion batteries, the internal short circuits or over-lithiation often cause structural transformation in electrodes and may lead to safety risks. Herein, we investigate the over-discharged mechanism of LiCoO2/graphite pouch cells, especially spatially resolving the morphological, surface phase, and local electronic structure of LiCoO2 electrode. With synchrotron-based X-ray techniques and Raman mapping, together with spectroscopy simulations, we demonstrate that over-lithiation reaction is a surface effect, accompanied by Co reduction and surface structure transformation to Li2CoO2/Co3O4/CoO/Li2O-like phases. This surface chemical distribution variation is relevant to the depth and exposed crystalline planes of LiCoO2 particles, and the distribution of binder/conductive additives. Theoretical calculations confirm that Li2CoO2-phase has lower electronic/ionic conductivity than LiCoO2-phase, further revealing the critical effect of distribution of conductive additives on the surface chemical heterogeneity evolution. Our findings on such surface phenomena are non-trivial and highlight the capability of synchrotron-based X-ray techniques for studying the spatial chemical phase heterogeneity.

Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-022-34161-4 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34161-4

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-022-34161-4

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().