Three-dimensional evaluation of compositional and structural changes in cycled LiNi1/3Co1/3Mn1/3O2 by atom probe tomography

Title
Three-dimensional evaluation of compositional and structural changes in cycled LiNi1/3Co1/3Mn1/3O2 by atom probe tomography
Authors
안재평이지영김한성김지윤조해인이치호이상욱Ty J. ProsaDavid J. Larson유태환
Issue Date
2018-03
Publisher
Journal of power sources
Citation
VOL 379-166
Abstract
Accelerated capacity fading of LiNi1/3Co1/3Mn1/3O2 (NCM111) electrode by the chemical migration of lithium (Li) or transition metals (TMs), and surface reconstruction in the surface during electrochemical cycling were evaluated by correlative analysis of atom probe tomography (APT) and transmission electron microscopy (TEM). The cycled NCM111 showed a lack of Li at surface which provides the driving force for long-range Ni migration toward surface. A schematic model for phase transformation and the kinetics of TM migration within the layered structure by density functional theory (DFT) calculations was proposed. This study provides insights into capacity loss and voltage fade upon electrochemical charge-discharge process of NCM111 by measuring the variation of Li composition away from the surface.
URI
http://pubs.kist.re.kr/handle/201004/67326
ISSN
0378-7753
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KIST Publication > Article
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