Implementing intermittent current interruption into Li-ion cell modelling for improved battery diagnostics
Artikel i vetenskaplig tidskrift, 2022

A novel electroanalytical method, the intermittent current interruption (ICI) technique, has recently been promoted as a versatile tool for battery analysis and diagnostics. The technique enables frequent and continuous measurement of battery resistance, which then undergoes statistical analysis. Here, this method is implemented for commercial Li-ion cylindrical cells, and combined with a physics-based finite element model (FEM) of the battery to better interpret the measured resistances. Ageing phenomena such as solid electrolyte interphase (SEI) formation and metallic Li plating on the surface of the negative graphite particles are considered in the model. After validation, a long-term cycling simulation is conducted to mimic the ageing scenario of commercial cylindrical 21700 cells. The large number of internal resistance measurements obtained are subsequently visualized by creating a ‘resistance map’ as a function of both capacity and cycle numbers, providing a straight-forward image of their continuous evolution. By correlating the observed ageing scenarios with specific physical processes, the origins of ageing are investigated. The result shows that a decrease of the electrolyte volume fraction contributes significantly to the increase of internal resistance and affect the electrolyte diffusivity properties. Additionally, effects of porosity and particle radius of the different electrodes are investigated, providing valuable suggestions for battery design.

Battery diagnostic

Physics-based model

Intermittent current interruption

Resistance mapping

Li-ion battery

Författare

Litao Yin

Uppsala universitet

Zeyang Geng

Chalmers, Elektroteknik, Elkraftteknik

Yu Chuan Chien

Uppsala universitet

Torbjörn Thiringer

Chalmers, Elektroteknik, Elkraftteknik

Matthew Lacey

Scania CV AB

Anna M. Andersson

ABB

D. Brandell

Uppsala universitet

Electrochimica Acta

0013-4686 (ISSN)

Vol. 427 140888

Ämneskategorier

Medicinsk laboratorie- och mätteknik

Materialkemi

Annan kemiteknik

DOI

10.1016/j.electacta.2022.140888

Mer information

Senast uppdaterat

2022-10-28