Predicting active material utilisation in LiFePO4 electrodes using a multi-scale mathematical model
Dargaville, Steven & Farrell, Troy W. (2010) Predicting active material utilisation in LiFePO4 electrodes using a multi-scale mathematical model. Journal of The Electrochemical Society (JES), 157(7), A830-A840.
A mathematical model is developed to simulate the discharge of a LiFePO4 cathode. This model contains 3 size scales, which match with experimental observations present in the literature on the multi-scale nature of LiFePO4 material. A shrinking-core is used on the smallest scale to represent the phase-transition of LiFePO4 during discharge. The model is then validated against existing experimental data and this validated model is then used to investigate parameters that influence active material utilisation. Specifically the size and composition of agglomerates of LiFePO4 crystals is discussed, and we investigate and quantify the relative effects that the ionic and electronic conductivities within the oxide have on oxide utilisation. We find that agglomerates of crystals can be tolerated under low discharge rates. The role of the electrolyte in limiting (cathodic) discharge is also discussed, and we show that electrolyte transport does limit performance at high discharge rates, confirming the conclusions of recent literature.
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|Item Type:||Journal Article|
|Keywords:||LiFePO4, mathematical modeling, battery, secondary batteries, multiscale mathematical modeling|
|Subjects:||Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000) > APPLIED MATHEMATICS (010200) > Applied Mathematics not elsewhere classified (010299)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Electrochemistry (030604)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > Mathematical Sciences
|Copyright Owner:||Copyright 2010 The Electrochemical Society|
|Deposited On:||27 Aug 2010 00:55|
|Last Modified:||29 Feb 2012 14:25|
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