scholarly journals Influence of the Calendar Aging on the Cycle Aging of LiNiMnCoO2 Lithium-Ion Batteries

2021 ◽  
Author(s):  
Wen-Feng Cai ◽  
Kuo-Ching Chen
Keyword(s):  
Late Stage ◽  
Lithium Ion ◽  
Storage Conditions ◽  
Cycle Life ◽  
Long Term Storage ◽  
Capacity Loss ◽  
Rest Time ◽  
A Cell ◽  
Semi Empirical

Abstract An experimental and theoretical study of lithium nickel manganese cobalt oxide (NMC) cells with a long rest time under different storage temperatures is carried out. We show that the long-term storage of a cell decisively influences its cycle life, and this influence is more pronounced at the late stage of the battery cycle life. Experimental outcomes demonstrate that the cycle life drops as the storage span lengthens, and the storage under relatively low temperature helps to reduce the cycle fading. Based on the experimental data, we identify the point on the fading trajectory to separate the early-medium stage and the late stage for the cycle aging. By extending the previously proposed semi-empirical model to incorporate the two-stage fading into a single formulation, the cycling capacity loss of the stored NMC cells is predicted. An incremental capacity analysis is further performed to assess the cycle fading of the cells under various storage conditions.

Semi-empirical long-term cycle life model coupled with an electrolyte depletion function for large-format graphite/LiFePO 4 lithium-ion batteries

2017 ◽  
Vol 365 ◽  
pp. 257-265 ◽  
Author(s):  
Joonam Park ◽  
Williams Agyei Appiah ◽  
Seoungwoo Byun ◽  
Dahee Jin ◽  
Myung-Hyun Ryou ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Cycle Life ◽  
Large Format ◽  
Electrolyte Depletion ◽  
Life Model ◽  
Semi Empirical

scholarly journals A Comparison of Lithium-Ion Cell Performance across Three Different Cell Formats

Batteries ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 38
Author(s):  
Grace Bridgewater ◽  
Matthew J. Capener ◽  
James Brandon ◽  
Michael J. Lain ◽  
Mark Copley ◽  
...  
Keyword(s):  
Degradation Mechanism ◽  
Single Layer ◽  
Lithium Ion ◽  
Capacity Loss ◽  
Lithium Ion Cells ◽  
Lithium Ion Cell ◽  
A Cell ◽  
The Difference ◽  
Discharge Capacities

To investigate the influence of cell formats during a cell development programme, lithium-ion cells have been prepared in three different formats. Coin cells, single layer pouch cells, and stacked pouch cells gave a range of scales of almost three orders of magnitude. The cells used the same electrode coatings, electrolyte and separator. The performance of the different formats was compared in long term cycling tests and in measurements of resistance and discharge capacities at different rates. Some test results were common to all three formats. However, the stacked pouch cells had higher discharge capacities at higher rates. During cycling tests, there were indications of differences in the predominant degradation mechanism between the stacked cells and the other two cell formats. The stacked cells showed faster resistance increases, whereas the coin cells showed faster capacity loss. The difference in degradation mechanism can be linked to the different thermal and mechanical environments in the three cell formats. The correlation in the electrochemical performance between coin cells, single layer pouch cells, and stacked pouch cells shows that developments within a single cell format are likely to lead to improvements across all cell formats.

Calendar Degradation and Self-Discharge Occurring During Short- and Long-Term Storage of NMC Based Lithium-Ion Batteries

2021 ◽  
Vol 105 (1) ◽  
pp. 3-11
Author(s):  
Vaclav Knap ◽  
Martin Molhanec ◽  
Alejandro Gismero ◽  
Daniel-Ioan Stroe
Keyword(s):  
Discharge Rate ◽  
Storage Period ◽  
Lithium Ion ◽  
Battery Lifetime ◽  
Long Term Storage ◽  
Capacity Loss ◽  
Degradation Rates ◽  
Battery Capacity ◽  
Short And Long Term

Idling periods are a major part of the Lithium-ion battery operation. Due to parasitic reactions, the battery capacity is decreasing and self-discharge occurs over time. Thus, in order to predict the battery lifetime and optimize its operation, it is required to capture this behavior. In this study, two different storage periods of 2 and 6 months were investigated and used to develop and validate models dedicated to reversible and irreversible capacity loss. It has been observed that while for the shorter storage period, the self-discharge rate does not change significantly, for the longer storage period it decreased during aging. Moreover, the degradation rates vary significantly for various time scales at low temperature, while at medium and high temperatures they are matching closely for 2- and 6-months periodic storage.

scholarly journals Co-encapsulation of vegetable oils with phenolic antioxidants and evaluation of their oxidative stability under long-term storage conditions

LWT ◽  
2021 ◽  
Vol 142 ◽  
pp. 111033
Author(s):  
Lorine Le Priol ◽  
Justine Gmur ◽  
Aurélien Dagmey ◽  
Sandrine Morandat ◽  
Karim El Kirat ◽  
...  
Keyword(s):  
Oxidative Stability ◽  
Vegetable Oils ◽  
Storage Conditions ◽  
Phenolic Antioxidants ◽  
Long Term Storage ◽  
Term Storage

scholarly journals Effects of Long-Term Storage on the Detection of Proteins, DNA, and mRNA in Tissue Microarray Slides

2011 ◽  
Vol 59 (12) ◽  
pp. 1113-1121 ◽  
Author(s):  
Christina Karlsson ◽  
Mats G. Karlsson
Keyword(s):  
Gene Copy Number ◽  
Tissue Microarrays ◽  
Storage Conditions ◽  
Gene Copy ◽  
Histological Techniques ◽  
Long Term Storage ◽  
Term Storage ◽  
Formalin Fixed

Storage of tissue slides has been claimed to induce dramatically reduced antigen detection particularly for immunohistochemistry (IHC). With tissue microarrays, the necessity to serially cut blocks in order to obtain as much material as possible is obvious. The presumed adverse effect of storage might hamper such an approach. The authors designed an experimental setting consisting of four different storage conditions with storage time of tissue slides of up to 1 year. Detection of proteins, DNA, and mRNA was performed using IHC and in situ hybridization techniques. Slight but significant changes in IHC occurred over time. The most important factor is the primary antibody used: four showed no significant changes, whereas limited decreases in 8 antibodies could be detected by image analysis. Whether the antigen was nuclear or cytoplasmic/membranous did not matter. No major differences between different storage conditions could be shown, but storage at 4C was overall the best procedure. Furthermore, gene copy number aberrations, chromosomal translocations, and the presence of mRNA could be detected on slides stored up to 1 year. In conclusion, in tissues optimally formalin fixed and using modern histological techniques, only minute changes in tissue antigenicity are induced by long-term storage.

scholarly journals Point-of-Use Detection of Environmental Fluoride via a Cell-Free Riboswitch-Based Biosensor

2019 ◽  
Author(s):  
Walter Thavarajah ◽  
Adam D. Silverman ◽  
Matthew S. Verosloff ◽  
Nancy Kelley-Loughnane ◽  
Michael C. Jewett ◽  
...  
Keyword(s):  
Water Source ◽  
Free System ◽  
Molecular Systems ◽  
Long Term Storage ◽  
Point Of Use ◽  
Regulatory Standard ◽  
A Cell ◽  
Global Concern ◽  
Dna Template

AbstractAdvances in biosensor engineering have enabled the design of programmable molecular systems to detect a range of pathogens, nucleic acids, and chemicals. Here, we engineer and field-test a biosensor for fluoride, a major groundwater contaminant of global concern. The sensor consists of a cell-free system containing a DNA template that encodes a fluoride-responsive riboswitch regulating genes that produce a fluorescent or colorimetric output. Individual reactions can be lyophilized for long-term storage and detect fluoride at levels above 2 parts per million, the EPA’s most stringent regulatory standard, in both laboratory and field conditions. Through onsite detection of fluoride in a real-world water source, this work provides a critical proof-of-principle for the future engineering of riboswitches and other biosensors to address challenges for global health and the environment.

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