Thermal stability of LiPF6-based electrolyte and effect of contact with various delithiated cathodes of Li-ion batteries

Xiang, Hongfa; Wang, H.; Chen, C.H.; Ge, Xinlei; Guo, Shirui; Sun, Jinhua; Hu, Weiyan

doi:10.1016/j.jpowsour.2009.02.045

Cited by 116 publications

(104 citation statements)

References 37 publications

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“…The listed heat of the reaction is the sum of the heats of the reactions of the different stages. The heats of the reactions are in good agreement with the results from the literature [2,15] as are the activation energies [5].…”

Section: Results For 18650 Cells With Different Cathode Materialssupporting

confidence: 87%

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Experimental Analysis of Thermal Runaway in 18650 Cylindrical Li-Ion Cells Using an Accelerating Rate Calorimeter

et al. 2017

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Abstract:In this work, commercial 18650 lithium-ion cells with LiMn 2 O 4 , LiFePO 4 , and Li(Ni 0.33 Mn 0.33 Co 0.33 )O 2 cathodes were exposed to external heating in an accelerating rate calorimeter (es-ARC, Thermal Hazard Technology (THT), Bletchley, UK), to investigate the thermal behavior under abuse conditions. New procedures for measuring the external and internal pressure change of cells were developed. The external pressure was measured utilizing a gas-tight cylinder inside the calorimeter chamber, in order to detect the venting of the cells. For internal pressure measurements, a pressure line connected to a pressure transducer was directly inserted into the cell. During the thermal runaway experiments, three stages (low rate, medium rate, and high rate reactions) were observed. Both the pressure and temperature change indicated different stages of exothermic reactions, which produced gases or/and heat. The onset temperature of the thermal runaway was estimated according to the temperature and pressure changes. Moreover, the different activation energies for the exothermic reactions could be derived from Arrhenius plots.

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Section: Results For 18650 Cells With Different Cathode Materialssupporting

confidence: 87%

“…The heats of the reactions are in good agreement with the results from the literature [2,15] as are the activation energies [5]. The next step could be to use the derived thermokinetic parameters as input parameters for our coupled electrochemical thermal model [16].…”

Section: Results For 18650 Cells With Different Cathode Materialssupporting

confidence: 76%

Experimental Analysis of Thermal Runaway in 18650 Cylindrical Li-Ion Cells Using an Accelerating Rate Calorimeter

et al. 2017

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“…However, concerns have been raised about the thermal stability of LiCoO 2 and its tendency to release pure oxygen when over-charged, providing an ideal environment for combustion [10]. As lithium-ion technology has matured, lithium iron phosphate (LiFePO 4 ) cathodes have gained wide acceptance in applications such as power tools and electric vehicles due particularly to their enhanced thermal stability over LiCoO 2 cathodes [11]. Batteries made with LiFePO 4 cathodes operate within a lower voltage range and have slightly less charge storage capacity than batteries with LiCoO 2 cathodes, but these factors should have been weighed against safety improvements when deciding on the type of lithium-ion battery to install in an aircraft.…”

Section: Lithium-ion Battery Use In Commercial Avionicsmentioning

confidence: 99%

Lessons Learned from the 787 Dreamliner Issue on Lithium-Ion Battery Reliability

et al. 2013

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On 16 January 2013, all Boeing 787 Dreamliners were indefinitely grounded due to lithium-ion battery failures that had occurred in two planes. Subsequent investigations into the battery failures released through the National Transportation Safety Board (NTSB) factual report, the March 15th Boeing press conference in Japan, and the NTSB hearings in Washington D.C., never identified the root causes of the failures-a major concern for ensuring safety and meeting reliability expectations. This paper discusses the challenges to lithium-ion battery qualification, reliability assessment, and safety in light of the Boeing 787 battery failures. New assessment methods and control techniques that can improve battery reliability and safety in avionic systems are then presented.

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“…Also it is known that systems containing Mn have lower onset temperatures in the presence of electrolytes due to the dissolution of Mn-ions in the electrolyte which is further influenced by the structural instability of the electrode materials. 1,3,16 Hence in the presence of electrolyte the onset temperature of degradation of the electrode-electrolyte system could be even much more reduced.…”

Section: In Situ Structural Analysesmentioning

confidence: 99%

Thermal stability of Li1-ΔM0.5Mn1.5O4 (M = Fe, Co, Ni) cathodes in different states of delithiation Δ

et al. 2013

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The thermal stability of sol-gel synthesized Li 12D M 0.5 Mn 1.5 O 4 (M = Fe, Co, Ni) electrodes with different degrees of delithiation were analyzed with TG-DSC and in situ synchrotron diffraction under an Ar atmosphere and compared. The onset temperatures for structural degradation are dependent on the amount of lithium 12D in the sample. The Li 12D Fe 0.5 Mn 1.5 O 4 electrode exhibited the highest thermal stability among the three materials with different dopant M. The reason for this difference is discussed with respect to the oxidation states of the transition metals. The mechanism of degradation for M = Fe, Co was found to be through gas evolution, mainly CO 2 and O 2 , and the carbon conductive additive was found to play a major role in the thermal degradation process. For delithiated Li 12D Ni 0.5 Mn 1.5 O 4 the temperature induced degradation includes phase separation into Mn 3 O 4 with spinel structure and Li x Ni 12x O with rocksalt structure together with oxygen and carbon dioxide release.

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Thermal stability of LiPF6-based electrolyte and effect of contact with various delithiated cathodes of Li-ion batteries

Cited by 116 publications

References 37 publications

Experimental Analysis of Thermal Runaway in 18650 Cylindrical Li-Ion Cells Using an Accelerating Rate Calorimeter

Experimental Analysis of Thermal Runaway in 18650 Cylindrical Li-Ion Cells Using an Accelerating Rate Calorimeter

Lessons Learned from the 787 Dreamliner Issue on Lithium-Ion Battery Reliability

Thermal stability of Li1-ΔM0.5Mn1.5O4 (M = Fe, Co, Ni) cathodes in different states of delithiation Δ

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