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Title: Galvanostatic Intermittent Titration and Performance Based Analysis of LiNi0.5Co0.2 Mn0.3O2Cathode

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.1701713jes· OSTI ID:1417874
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Galvanostatic intermittent titration technique (GITT) – a popular method for characterizing kinetic and transport properties of battery electrodes – is predicated on the proper evaluation of electrode active area. LiNi0.5044Co0.1986Mn0.2970O2 (NCM523) material exhibits a complex morphology in which sub-micron primary particles aggregate to form secondary particle agglomerates. This work proposes a new active area formulation for primary/secondary particle agglomerate materials to better mimic the morphology of NCM532 electrodes. This formulation is then coupled with macro-homogeneous models to simulate GITT and half-cell performance of NCM523 electrodes. Subsequently, the model results are compared against the experimental results to refine the area formulation. A single parameter, the surface roughness factor, is proposed to mimic the change in interfacial area, diffusivity and exchange current density simultaneously and detailed modeling results are presented to provide valuable insights into the efficacy of the formulation.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technology
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1417874
Journal Information:
Journal of the Electrochemical Society, Vol. 164, Issue 13; ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English

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Investigation of Lithium Plating-Stripping Process in Li-Ion Batteries at Low Temperature Using an Electrochemical Model journal January 2018
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