2014
DOI: 10.1016/j.jpowsour.2014.07.126
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Analysis of effects of the state of charge on the formation and growth of the deposit layer on graphite electrode of pouch type lithium ion polymer batteries

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Cited by 30 publications
(22 citation statements)
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“…These values are comparable to findings by other groups. 37,43,45 The sum of the thicknesses of all deposit layers on the 34 anode sheets agrees with the observed overall thickness increase of the cell. Regarding the irreversible thickness changes from cycle number 362 to 396, the mean value across the measurement area was found to be 1.0911 mm which translates into a relative thickness increase of 17% for the whole cell.…”
Section: Resultssupporting
confidence: 83%
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“…These values are comparable to findings by other groups. 37,43,45 The sum of the thicknesses of all deposit layers on the 34 anode sheets agrees with the observed overall thickness increase of the cell. Regarding the irreversible thickness changes from cycle number 362 to 396, the mean value across the measurement area was found to be 1.0911 mm which translates into a relative thickness increase of 17% for the whole cell.…”
Section: Resultssupporting
confidence: 83%
“…) unless CC License in place (see abstract The irreversible part of the thickness change can be related to solid electrolyte interphase (SEI) growth 37 in the form of a deposit layer on the particles of the graphite electrode, new crystal arrangement within the particles, 38 increasing porosity of the electrodes due to continuous volume change 39 as well as particle size increase caused by void formation. 40 The parameter t irrev is determined by subtracting the initial thickness (k = 0) from the thickness at the end of check-up after cycle quantity k. Both thickness values are measured in the fully discharged state of the cell (SOC = 0).…”
mentioning
confidence: 99%
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“…These layers differ from the much thinner SEI layer that forms on the graphite particle surface. 7,11,33 The back-scattered electron micrograph and EDX elemental analysis clearly identify the composition of these layers: i) bright porous regions in Figures 10a-10c (fresh electrode) and Figures 10e-10g (aged electrode) that are made up of Al 2 O 3 remaining from the coating on the separator and ii) smooth layer visible in the secondary-electron micrograph (most notably in Figure 10g for the aged electrode compared with Figure 10c for the fresh electrode) and appearing on the dark regions in the back-scattered electron micrograph that is a secondary passivating layer rich in oxygen (∼47 at %), fluorine (∼10%) and phosphorous (∼2%) and presumably com- Figure 9. Variation of potential of (a) positive electrode and (b) negative electrode with discharge current recorded at 10% depth of discharge for fresh electrodes and those harvested from the pouch cell aged for 9 months at 60 • C and 100% SOC storage condition.…”
Section: Resultsmentioning
confidence: 99%
“…If cell disassembly is performed, the procedure needs to take place in a glove box purged with an inert gas (often argon) with a low water vapor and oxygen environment (<5 ppm of each) [21]. Once the cell is disassembled, researchers have utilized analytical techniques including time-of-flight secondary ion mass spectometry (TOF-SIMS) [30], scanning electron microscopy (SEM) [30,31], transmission electron microscopy (TEM) [32], X-ray photoelectron spectroscopy (XPS) [30,33,34,38], X-ray absorption spectroscopy (XAS) [35], atomic force microscopy (AFM) [38], Fourier transform infrared (FTIR) spectroscopy [34,36], and Raman spectroscopy [37] to study the thickness, morphology, and composition of the SEI layer. Despite the numerous measurement techniques, additional research into the SEI layer is necessary, especially if a realistic SEI growth model is desired.…”
Section: Anode Active Materialsmentioning
confidence: 99%