Quantifying Changes to the Electrolyte and Negative Electrode in Aged NMC532/Graphite Lithium-Ion Cells

L. M Thompson; W Stone; A Eldesoky; N. K Smith; C. R. M McFarlane; J. S Kim; M. B Johnson; R Petibon; J. R Dahn

doi:10.1149/2.0721811jes

Back

Quantifying Changes to the Electrolyte and Negative Electrode in Aged NMC532/Graphite Lithium-Ion Cells

Journal article

Open access

Quantifying Changes to the Electrolyte and Negative Electrode in Aged NMC532/Graphite Lithium-Ion Cells

L. M Thompson, W Stone, A Eldesoky, N. K Smith, C. R. M McFarlane, J. S Kim, M. B Johnson, R Petibon and J. R Dahn

Journal of the Electrochemical Society, Vol.165(11), pp.A2732-A2740

01/2018

DOI: 10.1149/2.0721811jes

Files and links (1)

url

https://doi.org/10.1149/2.0721811jesView

Published (Version of record) Open Access

Abstract

A set of LiNi0.5Mn0.3Co0.2O2/graphite lithium-ion cells underwent 750 charge-discharge cycles during about 8 months at 55°C to upper cutoff potentials of 4.0, 4.1, 4.2, 4.3, and 4.4 V. The electrolyte in these cells was extracted using a centrifuge method and studied using gas chromatography/mass spectrometry to determine the changes to the solvents and by inductively coupled plasma-mass spectrometry to determine the changes to the salt content in the electrolyte. The negative electrodes from the cells were harvested and studied by micro-X-ray fluorescence to quantify the amount of transition metals which migrated from the positive electrode to the negative electrode during the testing. Emphasis is given to a detailed description of the quantitative methods used in the hope that others will adopt them in similar studies of different types of aged lithium-ion cells. The cells studied here initially had 1.1 molal LiPF6 ethylene carbonate (EC): ethyl methyl carbonate (EMC) (3:7 by weight) electrolyte. The aged cells showed increasing amounts of dimethyl carbonate and diethyl carbonate created by transesterification as the upper cutoff potential increased. Only extremely small amounts of Mn, less than 0.1% of the total Mn in the positive electrode, were found on the negative electrode after this aggressive testing.

Details

Title: Subtitle: Quantifying Changes to the Electrolyte and Negative Electrode in Aged NMC532/Graphite Lithium-Ion Cells
Creators: L. M Thompson - Dalhousie University Department of Chemistry, , Canada
W Stone - Dalhousie University Department of Physics and Atmospheric Science, , Canada
A Eldesoky - University of New Brunswick Department of Chemistry, , Canada
N. K Smith - Dalhousie University Department of Community Health and Epidemiology, , Canada
C. R. M McFarlane - University of New Brunswick Department of Earth Science, , Canada
J. S Kim - Dalhousie University Department of Community Health and Epidemiology, , Canada
M. B Johnson - Dalhousie University Department of Physics and Atmospheric Science, , Canada
R Petibon - Tesla Canada , Canada
J. R Dahn - Dalhousie University Department of Physics and Atmospheric Science, , Canada
Resource Type: Journal article
Publication Details: Journal of the Electrochemical Society, Vol.165(11), pp.A2732-A2740
DOI: 10.1149/2.0721811jes
ISSN: 0013-4651
eISSN: 1945-7111
Publisher: The Electrochemical Society
Number of pages: 9
Language: English
Date published: 01/2018
Academic Unit: Occupational and Environmental Health
Record Identifier: 9984214940702771

Metrics

8 Record Views

89 Times Cited - Web of Science