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Title: Identifying degradation mechanisms in lithium-ion batteries with coating defects at the cathode

Abstract

Understanding the effect of electrode manufacturing defects on lithium-ion battery (LIB) performance is key to reducing the scrap rate and cost during cell manufacturing. In this regard, it is necessary to quantify the impact of various defects that are generated during the electrode coating process. To this end, we have tested large-format 0.5 Ah LiNi0.5Mn0.3Co0.2O2/graphite pouch cells with defects intentionally introduced into the cathode coating. Different types of coating defects were tested including agglomerates, pinholes, and non-uniform coating. Electrodes with larger non-coated surface had greater capacity fade than baseline electrodes, while pinholes and agglomerates did not affect performance adversely. Furthermore, post cycle analysis of electrodes showed that the anode facing the defective region in the cathode was clearly impacted by the defect. Further characterization using Raman spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction provided evidence for a proposed mechanism for material degradation related to the most detrimental type of coating defect.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1480631
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Applied Energy
Additional Journal Information:
Journal Volume: 231; Journal Issue: C; Journal ID: ISSN 0306-2619
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Li-ion battery; Manufacturing; Electrode coating; Raman mapping; XPS; Computational modeling

Citation Formats

David, Lamuel Abraham, Ruther, Rose E., Mohanty, Debasish, Meyer, III, Harry M., Sheng, Yangping, Kalnaus, Sergiy, Daniel, Claus, and Wood, III, David L. Identifying degradation mechanisms in lithium-ion batteries with coating defects at the cathode. United States: N. p., 2018. Web. doi:10.1016/j.apenergy.2018.09.073.
David, Lamuel Abraham, Ruther, Rose E., Mohanty, Debasish, Meyer, III, Harry M., Sheng, Yangping, Kalnaus, Sergiy, Daniel, Claus, & Wood, III, David L. Identifying degradation mechanisms in lithium-ion batteries with coating defects at the cathode. United States. https://doi.org/10.1016/j.apenergy.2018.09.073
David, Lamuel Abraham, Ruther, Rose E., Mohanty, Debasish, Meyer, III, Harry M., Sheng, Yangping, Kalnaus, Sergiy, Daniel, Claus, and Wood, III, David L. Thu . "Identifying degradation mechanisms in lithium-ion batteries with coating defects at the cathode". United States. https://doi.org/10.1016/j.apenergy.2018.09.073. https://www.osti.gov/servlets/purl/1480631.
@article{osti_1480631,
title = {Identifying degradation mechanisms in lithium-ion batteries with coating defects at the cathode},
author = {David, Lamuel Abraham and Ruther, Rose E. and Mohanty, Debasish and Meyer, III, Harry M. and Sheng, Yangping and Kalnaus, Sergiy and Daniel, Claus and Wood, III, David L.},
abstractNote = {Understanding the effect of electrode manufacturing defects on lithium-ion battery (LIB) performance is key to reducing the scrap rate and cost during cell manufacturing. In this regard, it is necessary to quantify the impact of various defects that are generated during the electrode coating process. To this end, we have tested large-format 0.5 Ah LiNi0.5Mn0.3Co0.2O2/graphite pouch cells with defects intentionally introduced into the cathode coating. Different types of coating defects were tested including agglomerates, pinholes, and non-uniform coating. Electrodes with larger non-coated surface had greater capacity fade than baseline electrodes, while pinholes and agglomerates did not affect performance adversely. Furthermore, post cycle analysis of electrodes showed that the anode facing the defective region in the cathode was clearly impacted by the defect. Further characterization using Raman spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction provided evidence for a proposed mechanism for material degradation related to the most detrimental type of coating defect.},
doi = {10.1016/j.apenergy.2018.09.073},
journal = {Applied Energy},
number = C,
volume = 231,
place = {United States},
year = {2018},
month = {9}
}

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Cited by: 3 works
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Figures / Tables:

Figure 1 Figure 1: Schematic showing the formation of defects like pinholes or divots, agglomerates or blisters and line defects or non-uniform coating during the electrode coating process. The schematic explains the impact of cathode defects, but analogous issues are expected for anode defects. In this study, pinholes were formed by manuallymore » removing material from coated electrodes and agglomerates were formed by modifying the slurry mixing procedure. Line defects were coated using a special type of shim in the slotdie coating machine to mimic obstructions in the coater. Two sizes of line defects were analyzed: one large uncoated line and three smaller uncoated lines. Both line defects removed equal amounts of material.« less

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