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Title: Investigation of elevated temperature aging effects on lithium-ion cells

Abstract

Electrical and chemical measurements have been made on 18650-size lithium-ion cells that have been exposed to calendar and cycle life aging at temperatures up to 70 C. Aging times ranged from 2 weeks at the highest temperature to several months under more moderate conditions. After aging, the impedance behavior of the cells was reversed from that found originally, with lower impedance at low state of charge and the total impedance was significantly increased. Investigations using a reference electrode showed that these changes are primarily due to the behavior of the cathode. Measurements of cell impedance as a function of cell voltage reveal a pronounced minimum in the total impedance at approximately 40--50% state-of-charge (SOC). Chemical analysis data are presented to support the SOC assignments for aged and unaged cells. Electrochemical impedance spectroscopy (EIS) data have been recorded at several intermediate states of charge to construct the impedance vs. open circuit voltage curve for the cell. This information has not previously been available for the LiNi{sub 0.85}Co{sub 0.15}O{sub 2} cathode material. Structural and chemical analysis information obtained from cell components removed during postmortems will also be discussed in order to reveal the true state of charge of the cathode and tomore » develop a more complete lithium inventory for the cell.« less

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
756068
Report Number(s):
SAND2000-0927C
TRN: AH200020%%61
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 39th Power Sources Conference, Cherry Hill, NJ (US), 06/12/2000--06/15/2000; Other Information: PBD: 17 Apr 2000
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; LITHIUM-WATER-AIR BATTERIES; CATHODES; BATTERY CHARGE STATE; AGING; PERFORMANCE TESTING

Citation Formats

JUNGST,RUDOLPH G., NAGASUBRAMANIAN,GANESAN, and INGERSOLL,DAVID. Investigation of elevated temperature aging effects on lithium-ion cells. United States: N. p., 2000. Web.
JUNGST,RUDOLPH G., NAGASUBRAMANIAN,GANESAN, & INGERSOLL,DAVID. Investigation of elevated temperature aging effects on lithium-ion cells. United States.
JUNGST,RUDOLPH G., NAGASUBRAMANIAN,GANESAN, and INGERSOLL,DAVID. Mon . "Investigation of elevated temperature aging effects on lithium-ion cells". United States. https://www.osti.gov/servlets/purl/756068.
@article{osti_756068,
title = {Investigation of elevated temperature aging effects on lithium-ion cells},
author = {JUNGST,RUDOLPH G. and NAGASUBRAMANIAN,GANESAN and INGERSOLL,DAVID},
abstractNote = {Electrical and chemical measurements have been made on 18650-size lithium-ion cells that have been exposed to calendar and cycle life aging at temperatures up to 70 C. Aging times ranged from 2 weeks at the highest temperature to several months under more moderate conditions. After aging, the impedance behavior of the cells was reversed from that found originally, with lower impedance at low state of charge and the total impedance was significantly increased. Investigations using a reference electrode showed that these changes are primarily due to the behavior of the cathode. Measurements of cell impedance as a function of cell voltage reveal a pronounced minimum in the total impedance at approximately 40--50% state-of-charge (SOC). Chemical analysis data are presented to support the SOC assignments for aged and unaged cells. Electrochemical impedance spectroscopy (EIS) data have been recorded at several intermediate states of charge to construct the impedance vs. open circuit voltage curve for the cell. This information has not previously been available for the LiNi{sub 0.85}Co{sub 0.15}O{sub 2} cathode material. Structural and chemical analysis information obtained from cell components removed during postmortems will also be discussed in order to reveal the true state of charge of the cathode and to develop a more complete lithium inventory for the cell.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {4}
}

Conference:
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