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Title: Correlation of Electrolyte Volume and Electrochemical Performance in Lithium-Ion Pouch Cells with Graphite Anodes and NMC532 Cathodes

Abstract

The work herein reports on studies aimed at exploring the correlation between electrolyte volume and electrochemical performance of full cell, pouch-cells consisting of graphite/ Li 1.02Ni 0.50Mn 0.29Co 0.19O 2 (NMC-532) as the electrodes and 1.2 M LiPF6 in ethylene carbonate:ethylmethyl carbonate (EC:EMC) as the electrolyte. It is demonstrated that a minimum electrolyte volume factor of 1.9 times the total pore volume of cell components (cathode, anode, and separator) is needed for long-term cyclability and low impedance. Less electrolyte results in an increase of the measured ohmic resistances. Increased resistance ratios for charge transfer and passivation layers at cathode, relative to initial values, were 1.5–2.0 after 100 cycles. At the cathode, the resistance from charge transfer was 2–3 times higher than for passivation layers. Differential voltage analysis showed that anodes were less delithiated after discharging as the cells were cycled.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technology
OSTI Identifier:
1423447
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 164; Journal Issue: 6; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
Cycle life; Electrolyte volume; High Voltage; Lithium-ion; Resistance; full pouch cell

Citation Formats

An, Seong Jin, Li, Jianlin, Mohanty, Debasish, Daniel, Claus, Polzin, Bryant J., Croy, Jason R., E. Trask, Stephen, and Wood, David L. Correlation of Electrolyte Volume and Electrochemical Performance in Lithium-Ion Pouch Cells with Graphite Anodes and NMC532 Cathodes. United States: N. p., 2017. Web. doi:10.1149/2.1131706jes.
An, Seong Jin, Li, Jianlin, Mohanty, Debasish, Daniel, Claus, Polzin, Bryant J., Croy, Jason R., E. Trask, Stephen, & Wood, David L. Correlation of Electrolyte Volume and Electrochemical Performance in Lithium-Ion Pouch Cells with Graphite Anodes and NMC532 Cathodes. United States. doi:10.1149/2.1131706jes.
An, Seong Jin, Li, Jianlin, Mohanty, Debasish, Daniel, Claus, Polzin, Bryant J., Croy, Jason R., E. Trask, Stephen, and Wood, David L. Sun . "Correlation of Electrolyte Volume and Electrochemical Performance in Lithium-Ion Pouch Cells with Graphite Anodes and NMC532 Cathodes". United States. doi:10.1149/2.1131706jes.
@article{osti_1423447,
title = {Correlation of Electrolyte Volume and Electrochemical Performance in Lithium-Ion Pouch Cells with Graphite Anodes and NMC532 Cathodes},
author = {An, Seong Jin and Li, Jianlin and Mohanty, Debasish and Daniel, Claus and Polzin, Bryant J. and Croy, Jason R. and E. Trask, Stephen and Wood, David L.},
abstractNote = {The work herein reports on studies aimed at exploring the correlation between electrolyte volume and electrochemical performance of full cell, pouch-cells consisting of graphite/ Li1.02Ni0.50Mn0.29Co0.19O2 (NMC-532) as the electrodes and 1.2 M LiPF6 in ethylene carbonate:ethylmethyl carbonate (EC:EMC) as the electrolyte. It is demonstrated that a minimum electrolyte volume factor of 1.9 times the total pore volume of cell components (cathode, anode, and separator) is needed for long-term cyclability and low impedance. Less electrolyte results in an increase of the measured ohmic resistances. Increased resistance ratios for charge transfer and passivation layers at cathode, relative to initial values, were 1.5–2.0 after 100 cycles. At the cathode, the resistance from charge transfer was 2–3 times higher than for passivation layers. Differential voltage analysis showed that anodes were less delithiated after discharging as the cells were cycled.},
doi = {10.1149/2.1131706jes},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 6,
volume = 164,
place = {United States},
year = {2017},
month = {1}
}

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