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Impact of delithiated Li0FePO4 on the decomposition of LiPF6-based electrolyte studied by accelerating rate calorimetry

Röder, P. and Baba, N. and Friedrich, K. Andreas and Wiemhöfer, H.-D. (2013) Impact of delithiated Li0FePO4 on the decomposition of LiPF6-based electrolyte studied by accelerating rate calorimetry. Journal of Power Sources (236), pp. 151-157. Elsevier. DOI: 10.1016/j.jpowsour.2013.02.044 ISSN 0378-7753

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Abstract

Accelerating rate calorimetry (ARC) was used to investigate the impact of delithiated Li0FePO4 on the decomposition of LiPF6-based electrolyte. We used 1 M LiPF6 in a solvent mixture composed of dimethyl carbonate and ethylene carbonate ( 1:1 w/w). Commercially available LiFePO4-based 18650 lithium-ion cells were completely charged up to a cut-off voltage of 4.2 V and afterwards disassembled in an argon filled glove box. The whole sample preparation for an ARC experiment was carried out under argon atmosphere to prevent atmospheric influences. Beside the self heating rate, we also analysed the pressure rise during an experiment to evaluate the influence of delithiated Li0FePO4 on the electrolyte decomposition, which is primarily initiated by the conducting salt LiPF6. The results show both in the self heating rate and the pressure development an inhibiting effect of delithiated Li0FePO4 on the electrolyte decomposition. This effect is independent of the state of charge (SOC) and seems to be typical for (delithiated) Li0FePO4 in contrast to a commercial [Ni0.33Co0.33Mn0.33]O2/LiCoO2 blend. Besides that, we investigated the thermal behaviour of the bare Li0FePO4 and in presence of salt-free solvent. X-ray diffraction after measurements of delithiated Li0FePO4 in presence of electrolyte or salt-free solvent showed a new crystalline phase.

Item URL in elib:https://elib.dlr.de/84877/
Document Type:Article
Title:Impact of delithiated Li0FePO4 on the decomposition of LiPF6-based electrolyte studied by accelerating rate calorimetry
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Röder, P.Bosch GmbHUNSPECIFIED
Baba, N.Bosch GmbHUNSPECIFIED
Friedrich, K. AndreasAndreas.Friedrich (at) dlr.deUNSPECIFIED
Wiemhöfer, H.-D.Universität MünsterUNSPECIFIED
Date:February 2013
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.jpowsour.2013.02.044
Page Range:pp. 151-157
Publisher:Elsevier
ISSN:0378-7753
Status:Published
Keywords:Accelerating rate calorimetry LiFePO4 FePO4 LiPF6 Safety
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:30 Oct 2013 11:52
Last Modified:01 Dec 2018 19:49

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