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 ◽  
...  

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.

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3358
Author(s):  
Christian Geisbauer ◽  
Katharina Wöhrl ◽  
Daniel Koch ◽  
Gudrun Wilhelm ◽  
Gerhard Schneider ◽  
...  

The degradation of lithium-ion cells is an important aspect, not only for quality management, but also for the customer of the application like, e.g., scooters or electric vehicles. During the lifetime of the system, the overall health on the battery plays a key role in its depreciation. Therefore, it is necessary to monitor the health of the battery during operation, i.e., cycle life, but also during stationary conditions, i.e., calendar aging. In this work, the degradation due to calendar aging is analyzed for six different cell chemistries in terms of capacity degradation and impedance increase and their performance are being compared. In a new proposed metric, the relative deviations between various cells with the exact identical aging history are being analyzed for their degradation effects and their differences, which stands out in comparison to similar research. The capacity loss was found to be most drastic at 60 °C and at higher storage voltages, even for titanate-oxide cells. LiNiMnCoO2 (NMC), LiNiCoAlO2 (NCA) and Li2TiO3 (LTO) cells at 60 °C showed the most drastic capacity decrease. NMC and NCA cells at 60 °C and highest storage voltage did not show any open circuit voltage, as their current interrupt mechanism triggered. The effect of aging shows no uniform impact on the changes in the capacity variance when comparing different aging conditions, with respect to the evaluated standard deviation for all cells. The focus of this work was on the calendar aging effect and may be supplemented in a second study for cyclic aging.


Author(s):  
Э.Ю. Бучин ◽  
А.А. Мироненко ◽  
В.В. Наумов ◽  
А.С. Рудый ◽  
И.С. Федоров

Abstract: Films of amorphous silicon reinforced with crystalline copper silicide inclusions were tested as anode material in liquid lithium-ion cells. The films were made by the method of layer-by-layer magnetron deposition of amorphous silicon and copper, followed by low-temperature (100 ÷ 200 ° C) annealing of the structure. During the tests, the anodes revealed the effect of long-term intensive growth of their reversible capacity. To describe the effect, a phenomenological model is proposed, based on the counter-migration of silicon and copper atoms in a non-uniform field of elastic mechanical stresses arising during the cycling of a lithium-ion cell.


Author(s):  
Wen-Feng Cai ◽  
Kuo-Ching Chen

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.


2018 ◽  
Vol 19 ◽  
pp. 01035 ◽  
Author(s):  
Damian Burzyński ◽  
Damian Głuchy ◽  
Maksymilian Godek

The paper deals with the subject of influence of the Quick Charge technology on the parameters of the charging process of lithium-ion cells. Tests of lithium-ion cell parameters during the charging process were performed at three different temperatures using conventional and accelerated charging. Also, the following paper comprises conclusions related to the conducted tests.


2018 ◽  
Vol 122 (21) ◽  
pp. 11234-11248 ◽  
Author(s):  
Burak Aktekin ◽  
Matthew J. Lacey ◽  
Tim Nordh ◽  
Reza Younesi ◽  
Carl Tengstedt ◽  
...  

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