Comprehensive Modeling of Temperature-Dependent Degradation Mechanisms in Lithium Iron Phosphate Batteries

Kandler Smith, Michael Schimpe, Markus von Kuepach, Maik Naumann, Holger Hesse, Andreas Jossen

Research output: Contribution to journalArticlepeer-review

10 Scopus Citations

Abstract

For reliable lifetime predictions of lithium-ion batteries, models for cell degradation are required. A comprehensive semi-empirical model based on a reduced set of internal cell parameters and physically justified degradation functions for the capacity loss is developed and presented for a commercial lithium iron phosphate/graphite cell. One calendar and several cycle aging effects are modeled separately. Emphasis is placed on the varying degradation at different temperatures. Degradation mechanisms for cycle aging at high and low temperatures as well as the increased cycling degradation at high state of charge are calculated separately. For parameterization, a lifetime test study is conducted including storage and cycle tests. Additionally, the model is validated through a dynamic current profile based on real-world application in a stationary energy storage system revealing the accuracy. The model error for the cell capacity loss in the application-based tests is at the end of testing below 1 % of the original cell capacity.

Original languageAmerican English
Pages (from-to)147-170
Number of pages24
JournalECS Transactions
Volume80
Issue number10
DOIs
StatePublished - 2017
Event232nd ECS Meeting - National Harbor, United States
Duration: 1 Oct 20175 Oct 2017

Bibliographical note

Publisher Copyright:
© The Electrochemical Society.

NREL Publication Number

  • NREL/JA-5400-71542

Keywords

  • aging
  • degradation
  • energy storage
  • life model
  • lithium-ion battery

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