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Semi-empirical long-term cycle life model coupled with an electrolyte depletion function for large-format graphite/LiFePO4 lithium-ion batteries

Title
Semi-empirical long-term cycle life model coupled with an electrolyte depletion function for large-format graphite/LiFePO4 lithium-ion batteries
Authors
Park, JoonamAppiah, Williams AgyeiByun, Seoung WooJin, DaheeRyou, Myung-HyunLee, Yong Min
DGIST Authors
Appiah, Williams Agyei; Byun, Seoung Woo; Lee, Yong Min
Issue Date
2017
Citation
Journal of Power Sources, 365, 257-265
Type
Article
Article Type
Article
Keywords
Capacity Fade MechanismsCellsCharging (Batteries)Cycle LivesDischargeElectric BatteriesElectric DischargesElectrochemical PerformanceElectrochemical ReactionsElectrolyte DepletionElectrolytesEquivalent CircuitsGraphiteIonsLarge FormatLarge-Format Lithium-Ion BatteryLithiumLithium CompoundsLithium-Ion BatteriesMathematical-ModelModel And SimulationModeling And SimulationOperating ConditionPorous Composite ElectrodesRare Earth AlloysReaction KineticsSecondary BatteriesSemi-Empirical Cycle Life ModelSemi-Empirical ModelingSimulationStatistical Process ControlStorage
ISSN
0378-7753
Abstract
To overcome the limitation of simple empirical cycle life models based on only equivalent circuits, we attempt to couple a conventional empirical capacity loss model with Newman's porous composite electrode model, which contains both electrochemical reaction kinetics and material/charge balances. In addition, an electrolyte depletion function is newly introduced to simulate a sudden capacity drop at the end of cycling, which is frequently observed in real lithium-ion batteries (LIBs). When simulated electrochemical properties are compared with experimental data obtained with 20 Ah-level graphite/LiFePO4 LIB cells, our semi-empirical model is sufficiently accurate to predict a voltage profile having a low standard deviation of 0.0035 V, even at 5C. Additionally, our model can provide broad cycle life color maps under different c-rate and depth-of-discharge operating conditions. Thus, this semi-empirical model with an electrolyte depletion function will be a promising platform to predict long-term cycle lives of large-format LIB cells under various operating conditions. © 2017 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/4754
DOI
10.1016/j.jpowsour.2017.08.094
Publisher
Elsevier B.V.
Files:
There are no files associated with this item.
Collection:
Energy Science and EngineeringETC1. Journal Articles
ETC1. Journal Articles


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