A continuum model for lithium plating and dendrite formation in lithium-ion batteries: Formulation and validation against experiment

Smita Sahu, Jamie Foster*

*Corresponding author for this work

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Abstract

Abstract: This work presents a novel physics-based model for lithium plating and dendrite formation in lithium-ion batteries. The formation of Li metal is an undesirable side-effect of fast charging and a primary contributor to cell degradation and failure. The model distinguishes between three types of plated Li metal, namely: (a) Li metal plated within the pores of the solid electrolyte interphase (assumed to be electronically connected to the anode and therefore recoverable); (b) dendrites protruding outside the SEI that remain electronically connected (and are therefore dangerous, potentially leading to a short circuit), and (c) electronically disconnected/“dead” Li metal outside the SEI contributing to capacity fade. The model is validated against two independent experiments. First, measurements of: (i) the cell voltage and current during a constant-current–constant-voltage charge and subsequent discharge, and (ii) the Li metal intensities (derived from operando NMR) which directly quantifies the time-resolved quantity of Li metal in the cell during use. Second, against voltage measurements during galvanostatic discharge at a range of C-rates and temperatures. Favourable agreement is demonstrated throughout; particularly in terms of the proportions of reversible and irreversible plating. We also demonstrate that the model reproduces the well-documented trends of being more prevalent at increased C-rate and/or decreased temperature.
Keywords: Lithium plating; Lithium striping; Dead lithium; Newman model; DFN model; Single particle model; Degradation; Fast charge; Ageing; Capacity loss; Dendrites
Original languageEnglish
Article number106516
Number of pages12
JournalJournal of Energy Storage
Volume60
Early online date7 Jan 2023
DOIs
Publication statusEarly online - 7 Jan 2023

Keywords

  • Lithium plating
  • Lithium striping
  • Dead lithium
  • Newman model
  • DFN model
  • Single particle model
  • Degradation
  • Fast charge
  • Ageing
  • Capacity loss
  • Dendrites

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