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A Thermodynamic Model for Lithium-Ion Battery Degradation: Application of the Degradation-Entropy Generation Theorem

Mechanical Engineering Department, University of Texas at Austin, Austin, TX 78712, USA
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Inventions 2019, 4(2), 23; https://doi.org/10.3390/inventions4020023
Received: 19 February 2019 / Revised: 25 March 2019 / Accepted: 27 March 2019 / Published: 3 April 2019
(This article belongs to the Special Issue Thermodynamics in the 21st Century)
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Abstract

Presented is a lithium-ion battery degradation model, based on irreversible thermodynamics, which was experimentally verified, using commonly measured operational parameters. The methodology, applicable to all lithium-ion batteries of all chemistries and composition, combined fundamental thermodynamic principles, with the Degradation–Entropy Generation theorem, to relate instantaneous capacity fade (loss of useful charge-holding capacity) in the lithium-ion battery, to the irreversible entropy generated via the underlying dissipative physical processes responsible for battery degradation. Equations relating capacity fade—aging—to battery cycling were also formulated and verified. To show the robustness of the approach, nonlinear data from abusive and inconsistent battery cycling was measured and used to verify formulations. A near 100% agreement between the thermodynamic battery model and measurements was achieved. The model also gave rise to new material and design parameters to characterize all lithium-ion batteries. View Full-Text
Keywords: lithium-ion battery; battery aging; degradation analysis; entropy generation; capacity fade; voltage temperature; thermodynamics lithium-ion battery; battery aging; degradation analysis; entropy generation; capacity fade; voltage temperature; thermodynamics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Osara, J.A.; Bryant, M.D. A Thermodynamic Model for Lithium-Ion Battery Degradation: Application of the Degradation-Entropy Generation Theorem. Inventions 2019, 4, 23.

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