2024-03-29T01:43:44Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00018715
2023-01-16T04:07:32Z
320:321:322
Degradation analysis of a Ni-based layered positive-electrode active material cycled at elevated temperatures studied by scanning transmission electron microscopy and electron energy-loss spectroscopy
Kojima, Y.
Muto, S.
Tatsumi, K.
Kondo, H.
Oka, H.
Horibuchi, K.
Ukyo, Y.
open access
This is the author's version of a work that was accepted for publication in Journal of Power Sources. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms, may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Power Sources, v.196, n.18, 2011, p.7721–7727, DOI: 10.1016/j.jpowsour.2011.05.017
Lithium ion secondary battery
Cathode
Capacity fading
Scanning transmission electron microscopy
Electron energy-loss spectroscopy
We investigate the local structural changes in a positive electrode of a lithium ion secondary battery (LiNi0.8Co0.15Al0.05O2 (NCA) as the active material) associated with charge–discharge cycling at elevated temperatures by scanning transmission electron microscopy (STEM) and electron energy-loss spectroscopy (EELS). STEM–EELS spectral imaging reveals the evolution of a NiO-like phase localized near the surface and grain boundary regions after many cycles. The amounts of capacity fading and resistance increase are discussed based on the results of the semiquantitative estimation of NiO-like and other product phases. We also identify the chemical state of lithium in the NiO-like phase substituting for Ni.
Elsevier
2011-09
eng
journal article
AM
http://hdl.handle.net/2237/20821
https://nagoya.repo.nii.ac.jp/records/18715
https://doi.org/10.1016/j.jpowsour.2011.05.017
0378-7753
Journal of Power Sources
196
18
7721
7727
https://nagoya.repo.nii.ac.jp/record/18715/files/JPS2011.pdf
application/pdf
1.6 MB
2018-02-21