BROWSE

Related Researcher

Author's Photo

Lee, Zonghoon
Atomic-Scale Electron Microscopy (ASEM) Lab
Research Interests
  • Advanced Transmission Electron Microscopy (TEM/STEM), in Situ TEM, graphene, 2D materials, low-dimensional crystals, nanostructured materials

ITEM VIEW & DOWNLOAD

Microstructural study on degradation mechanism of layered LiNi0.6Co0.2Mn0.2O2 cathode materials by analytical transmission electron microscopy

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Microstructural study on degradation mechanism of layered LiNi0.6Co0.2Mn0.2O2 cathode materials by analytical transmission electron microscopy
Author
Kim, Na YeonYim, TaeeunSong, Jun HoYu, Ji-SangLee, Zonghoon
Issue Date
2016-03
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v.307, pp.641 - 648
Abstract
Electrochemical performance of lithium ion batteries is associated with structural and chemical stability of electrode materials. In the case of nickel-rich layered cathode materials LiNi0.6Co0.2Mn0.2O2, cation mixing, which results from the migration of transition metal ions into vacant lithium sites, is accelerated owing to similar ionic radii between nickel and lithium. However, the inevitable lattice distortions and chemical evolution have not been investigated intensely. In this paper, we report the structural evolution localized at surface regions through electron diffraction and high resolution imaging analyses with aberration-corrected transmission electron microscopy and scanning transmission electron microscopy. Repetition of volumetric change generates cracks and voids associated with deterioration of electrochemical performance. Structural change is related with (003) intensity in electron diffraction and it can be presented by dark field transmission electron microscopy imaging at a glance. Drastic structural degradation during early cycling shows relation with rapid capacity and voltage fade. Electron energy loss spectroscopy elucidates that the structural evolution caused by the migration of Ni ions accompanies chemical modification of Mn ions and creation of hole states at the O2p level. This study provides an insight into correlating structural and chemical evolution with degradation mechanism on battery performances of LiNi0.6Co0.2Mn0.2O2 cathode materials.
URI
https://scholarworks.unist.ac.kr/handle/201301/18217
URL
http://www.sciencedirect.com/science/article/pii/S0378775316300234
DOI
10.1016/j.jpowsour.2016.01.023
ISSN
0378-7753
Appears in Collections:
MSE_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU