scholarly journals Investigating the Effects of Mechanical Damage on Electrical Response of Li-Ion Pouch Cells

2020 ◽  
Author(s):  
Andrew Stacy ◽  
Mehdi Gilaki ◽  
Elham Sahraei ◽  
Damoon Soudbakhsh
Keyword(s):  
Electrical Response ◽  
Mechanical Damage ◽  
Li Ion

scholarly journals Electrical Response of Mechanically Damaged Lithium-Ion Batteries

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4284
Author(s):  
Damoon Soudbakhsh ◽  
Mehdi Gilaki ◽  
William Lynch ◽  
Peilin Zhang ◽  
Taeyoung Choi ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Electrical Response ◽  
Mechanical Damage ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Battery Management System ◽  
Battery Cell ◽  
Cell Parameters

Lithium-ion batteries have found various modern applications due to their high energy density, long cycle life, and low self-discharge. However, increased use of these batteries has been accompanied by an increase in safety concerns, such as spontaneous fires or explosions due to impact or indentation. Mechanical damage to a battery cell is often enough reason to discard it. However, if an Electric Vehicle is involved in a crash, there is no means to visually inspect all the cells inside a pack, sometimes consisting of thousands of cells. Furthermore, there is no documented report on how mechanical damage may change the electrical response of a cell, which in turn can be used to detect damaged cells by the battery management system (BMS). In this research, we investigated the effects of mechanical deformation on electrical responses of Lithium-ion cells to understand what parameters in electrical response can be used to detect damage where cells cannot be visually inspected. We used charge-discharge cycling data, capacity fade measurement, and Electrochemical Impedance Spectroscopy (EIS) in combination with advanced modeling techniques. Our results indicate that many cell parameters may remain unchanged under moderate indentation, which makes detection of a damaged cell a challenging task for the battery pack and BMS designers.

Nonparametric analysis of the short-term electrical response of Li-ion battery cells

2016 ◽  
Author(s):  
Rishi Relan ◽  
Yousef Firouz ◽  
Laurent Vanbeylen ◽  
Jean-Marc Timmermans ◽  
Johan Schoukens
Keyword(s):  
Electrical Response ◽  
Nonparametric Analysis ◽  
Li Ion Battery ◽  
Short Term ◽  
Li Ion ◽  
Battery Cells

BENDING DETECTION OF LI-ION POUCH CELLS USING IMPEDANCE SPECTRA

2021 ◽  
pp. 1-6
Author(s):  
Mohsen Derakhshan ◽  
Mehdi Gilaki ◽  
Andrew Stacy ◽  
Elham Sahraei ◽  
Damoon Soudbakhsh
Keyword(s):  
Electrochemical Impedance ◽  
Equivalent Circuit Model ◽  
Mechanical Damage ◽  
Form Factors ◽  
Control Group ◽  
Model Parameters ◽  
Impedance Spectra ◽  
Bending Load ◽  
Li Ion ◽  
Constant Phase Elements

Abstract Li-ion batteries are the preferred choice of energy storage in many applications. However, the potential for fire and explosion due to mechanical damage remains a safety concern. Currently, there are no criteria for the extent of the mechanical damage under which the batteries are safe to use. Here, we investigate the effects of bending damage to Li-ion cells on their impedance spectra. After the initial characterization of four Li-ion pouch cells, one of the cells underwent a three-point bending load. We measured the impedance spectra of this cell after each increment of loading. The impedance data of the control group cells were collected at the same intervals as the damaged cell. A distributed equivalent circuit model (dECM) was developed using the data from the electrochemical impedance spectroscopy (EIS) procedure. We observed that several model parameters such as the magnitude of constant phase elements had similar trends in the control cells and the bent cell. However, some model parameters such as resistances in parallel with constant phase elements, and the inductor showed dependency on the extent of the damage. These results suggest the potential for use of such parameters as an indicator of mechanical damage when visual inspection of cells is not possible in a battery pack setup. Future steps include investigation of similar trends for other commercial batteries,chemistries, and form factors to verify the applicability of the current findings in a broader context.

scholarly journals Systems-level investigation of aqueous batteries for understanding the benefit of water-in-salt electrolyte by synchrotron nanoimaging

2020 ◽  
Vol 6 (10) ◽  
pp. eaay7129 ◽  
Author(s):  
Cheng-Hung Lin ◽  
Ke Sun ◽  
Mingyuan Ge ◽  
Lisa M. Housel ◽  
Alison H. McCarthy ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Three Dimensional ◽  
Mechanical Damage ◽  
Operating Voltage ◽  
Li Ion Batteries ◽  
X Ray ◽  
Aqueous Battery ◽  
Li Ion ◽  
X Ray Absorption ◽  
Aqueous Batteries

Water-in-salt (WIS) electrolytes provide a promising path toward aqueous battery systems with enlarged operating voltage windows for better safety and environmental sustainability. In this work, a new electrode couple, LiV3O8-LiMn2O4, for aqueous Li-ion batteries is investigated to understand the mechanism by which the WIS electrolyte improves the cycling stability at an extended voltage window. Operando synchrotron transmission x-ray microscopy on the LiMn2O4 cathode reveals that the WIS electrolyte suppresses the mechanical damage to the electrode network and dissolution of the electrode particles, in addition to delaying the water decomposition process. Because the viscosity of WIS is notably higher, the reaction heterogeneity of the electrodes is quantified with x-ray absorption spectroscopic imaging, visualizing the kinetic limitations of the WIS electrolyte. This work furthers the mechanistic understanding of electrode–WIS electrolyte interactions and paves the way to explore the strategy to mitigate their possible kinetic limitations in three-dimensional architectures.

scholarly journals Electrical response of La2/3-xLi3xTiO3 ceramics obtained by spark plasma sintering

2020 ◽  
Vol 233 ◽  
pp. 04003
Author(s):  
J. Silva-Pereira ◽  
F. Guerrero ◽  
Y. Romaguera-Barcelay ◽  
L. Aguilera ◽  
R.S. Silva ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Electrical Response ◽  
Complex Impedance ◽  
High Energy ◽  
Total Conductivity ◽  
Plasma Sintering ◽  
Interesting Candidate ◽  
Spark Plasma ◽  
Li Ion ◽  
Conductive Mechanism

The ceramic system La2/3-xLi3xTiO3 presents as an interesting candidate to be used as an electrolyte in solid-state Li-ion batteries. In this paper the electrical response of the ceramic, La2/3-xLi3xTiO3 with x = 0.11 is reported. La2/3-xLi3xTiO3 nanoparticles were synthesized by high energy milling and sintered by Spark Plasma Sintering from an amorphous phase. After sintering, the samples were structurally characterized by XRD and Raman techniques. Measurements of complex impedance varying frequency from 1 Hz to 10 MHz and temperature from 25 °C to 270 °C were performed. The study of DC conductivity allowed us to find the contributions to the total conductivity, grain, and grain boundary of the samples. From the activation energy values, it was possible to determine the conductive mechanism corresponding to the mobility of Li+ ions.

Use of fractals to describe microstructures of porous thick-film platinum electrodes

1992 ◽  
Vol 50 (1) ◽  
pp. 314-315
Author(s):  
Steven D. Toteda
Keyword(s):  
Fractal Dimension ◽  
Power Plants ◽  
Electrical Response ◽  
Cubic Phase ◽  
Platinum Electrodes ◽  
Fine Grained ◽  
Impedance Response ◽  
Platinum Particles ◽  
Energy Surfaces ◽  
Highly Porous

Zirconia oxygen sensors, in such applications as power plants and automobiles, generally utilize platinum electrodes for the catalytic reaction of dissociating O2 at the surface. The microstructure of the platinum electrode defines the resulting electrical response. The electrode must be porous enough to allow the oxygen to reach the zirconia surface while still remaining electrically continuous. At low sintering temperatures, the platinum is highly porous and fine grained. The platinum particles sinter together as the firing temperatures are increased. As the sintering temperatures are raised even further, the surface of the platinum begins to facet with lower energy surfaces. These microstructural changes can be seen in Figures 1 and 2, but the goal of the work is to characterize the microstructure by its fractal dimension and then relate the fractal dimension to the electrical response. The sensors were fabricated from zirconia powder stabilized in the cubic phase with 8 mol% percent yttria. Each substrate was sintered for 14 hours at 1200°C. The resulting zirconia pellets, 13mm in diameter and 2mm in thickness, were roughly 97 to 98 percent of theoretical density. The Engelhard #6082 platinum paste was applied to the zirconia disks after they were mechanically polished ( diamond). The electrodes were then sintered at temperatures ranging from 600°C to 1000°C. Each sensor was tested to determine the impedance response from 1Hz to 5,000Hz. These frequencies correspond to the electrode at the test temperature of 600°C.

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