This page has only limited features, please log in for full access.
Philipp Dechent; Alexander Epp; Dominik Jöst; Yuliya Preger; Peter M. Attia; Weihan Li; Dirk Uwe Sauer. ENPOLITE: Comparing Lithium-Ion Cells across Energy, Power, Lifetime, and Temperature. ACS Energy Letters 2021, 6, 2351 -2355.
AMA StylePhilipp Dechent, Alexander Epp, Dominik Jöst, Yuliya Preger, Peter M. Attia, Weihan Li, Dirk Uwe Sauer. ENPOLITE: Comparing Lithium-Ion Cells across Energy, Power, Lifetime, and Temperature. ACS Energy Letters. 2021; 6 (6):2351-2355.
Chicago/Turabian StylePhilipp Dechent; Alexander Epp; Dominik Jöst; Yuliya Preger; Peter M. Attia; Weihan Li; Dirk Uwe Sauer. 2021. "ENPOLITE: Comparing Lithium-Ion Cells across Energy, Power, Lifetime, and Temperature." ACS Energy Letters 6, no. 6: 2351-2355.
Battery degradation is a fundamental concern in battery research, with the biggest challenge being to maintain performance and safety upon usage. From the microstructure of the materials to the design of the cell connectors in modules and their assembly in packs, it is impossible to achieve perfect reproducibility. Small manufacturing or environmental variations will compound big repercussions on pack performance and reliability. This review covers the origins of cell-to-cell variations and inhomogeneities on a multiscale level, their impact on electrochemical performance, as well as their characterization and tracking methods, ranging from the use of large-scale equipment to in operando studies.
David Beck; Philipp Dechent; Mark Junker; Dirk Sauer; Matthieu Dubarry. Inhomogeneities and Cell-to-Cell Variations in Lithium-Ion Batteries, a Review. Energies 2021, 14, 3276 .
AMA StyleDavid Beck, Philipp Dechent, Mark Junker, Dirk Sauer, Matthieu Dubarry. Inhomogeneities and Cell-to-Cell Variations in Lithium-Ion Batteries, a Review. Energies. 2021; 14 (11):3276.
Chicago/Turabian StyleDavid Beck; Philipp Dechent; Mark Junker; Dirk Sauer; Matthieu Dubarry. 2021. "Inhomogeneities and Cell-to-Cell Variations in Lithium-Ion Batteries, a Review." Energies 14, no. 11: 3276.
Lithium-Ion battery lifetimes from cyclic and calendar aging tests of more than 1000 cells were compared employing novel plots termed ENPOLITE (energy-power-lifetime-temperature). Battery cell data from in-house measurements and published data were combined into a uniform database; the total dataset size exceeds 1000 GB. At a glance, ENPOLITE plots inform about the nominal capacity, cell format, cell chemistry, average aging test duration, measurement temperature, specific power employed for testing, energy density, and the achieved lifetime for every cell. A battery lifetime coefficient was derived, allowing the comparison of lithium-ion batteries with different weights or volumes, capacities, and cell chemistries. The combination of multiple parameters in ENPOLITE facilitated a thorough comparison of various batteries' respective lifetimes. In addition to the cell-specific parameters during cycling, the specific stored energy and the storage temperature were depicted in a calendar ENPOLITE-Plot.
Philipp Dechent; Alexander Epp; Dominik Jöst; Yuliya Preger; Peter Attia; Weihan Li; Dirk Uwe Sauer. ENPOLITE: Comparing Lithium-Ion Cells across Energy, Power, Lifetime, and Temperature. 2021, 1 .
AMA StylePhilipp Dechent, Alexander Epp, Dominik Jöst, Yuliya Preger, Peter Attia, Weihan Li, Dirk Uwe Sauer. ENPOLITE: Comparing Lithium-Ion Cells across Energy, Power, Lifetime, and Temperature. . 2021; ():1.
Chicago/Turabian StylePhilipp Dechent; Alexander Epp; Dominik Jöst; Yuliya Preger; Peter Attia; Weihan Li; Dirk Uwe Sauer. 2021. "ENPOLITE: Comparing Lithium-Ion Cells across Energy, Power, Lifetime, and Temperature." , no. : 1.
Lisa Kathrin Willenberg; Philipp Dechent; Georg Fuchs; Moritz Teuber; Marcel Eckert; Martin Graff; Niklas Kürten; Dirk Uwe Sauer; Egbert Figgemeier. The Development of Jelly Roll Deformation in 18650 Lithium-Ion Batteries at Low State of Charge. Journal of The Electrochemical Society 2020, 167, 120502 .
AMA StyleLisa Kathrin Willenberg, Philipp Dechent, Georg Fuchs, Moritz Teuber, Marcel Eckert, Martin Graff, Niklas Kürten, Dirk Uwe Sauer, Egbert Figgemeier. The Development of Jelly Roll Deformation in 18650 Lithium-Ion Batteries at Low State of Charge. Journal of The Electrochemical Society. 2020; 167 (12):120502.
Chicago/Turabian StyleLisa Kathrin Willenberg; Philipp Dechent; Georg Fuchs; Moritz Teuber; Marcel Eckert; Martin Graff; Niklas Kürten; Dirk Uwe Sauer; Egbert Figgemeier. 2020. "The Development of Jelly Roll Deformation in 18650 Lithium-Ion Batteries at Low State of Charge." Journal of The Electrochemical Society 167, no. 12: 120502.
This paper proposes a testing method that allows the monitoring of the development of volume expansion of lithium-ion batteries. The overall goal is to demonstrate the impact of the volume expansion on battery ageing. The following findings are achieved: First, the characteristic curve shape of the diameter change depended on the state-of-charge and the load direction of the battery. The characteristic curve shape consisted of three areas. Second, the characteristic curve shape of the diameter change changed over ageing. Whereas the state-of-charge dependent geometric alterations were of a reversible nature. An irreversible effect over the lifetime of the cell was observed. Third, an s-shaped course of the diameter change indicated two different ageing effects that led to the diameter change variation. Both reversible and irreversible expansion increased with ageing. Fourth, a direct correlation between the diameter change and the capacity loss of this particular lithium-ion battery was observed. Fifth, computer tomography (CT) measurements showed deformation of the jelly roll and post-mortem analysis showed the formation of a covering layer and the increase in the thickness of the anode. Sixth, reproducibility and temperature stability of the strain gauges were shown. Overall, this paper provides the basis for a stable and reproducible method for volume expansion analysis applied and established by the investigation of a state-of-the-art lithium-ion battery cell. This enables the study of volume expansion and its impact on capacity and cell death.
Lisa K. Willenberg; Philipp Dechent; Georg Fuchs; Dirk Uwe Sauer; Egbert Figgemeier. High-Precision Monitoring of Volume Change of Commercial Lithium-Ion Batteries by Using Strain Gauges. Sustainability 2020, 12, 557 .
AMA StyleLisa K. Willenberg, Philipp Dechent, Georg Fuchs, Dirk Uwe Sauer, Egbert Figgemeier. High-Precision Monitoring of Volume Change of Commercial Lithium-Ion Batteries by Using Strain Gauges. Sustainability. 2020; 12 (2):557.
Chicago/Turabian StyleLisa K. Willenberg; Philipp Dechent; Georg Fuchs; Dirk Uwe Sauer; Egbert Figgemeier. 2020. "High-Precision Monitoring of Volume Change of Commercial Lithium-Ion Batteries by Using Strain Gauges." Sustainability 12, no. 2: 557.