Klemen Zelič (Author), Igor Mele (Author), Ivo Pačnik (Author), Jože Moškon (Author), Miran Gaberšček (Author), Tomaž Katrašnik (Author)

Abstract

Phase separating Li-ion battery cell cathode materials feature a well-known phenomenon called the memory effect. It manifests itself as an abnormal change in working voltage being dependent on cell cycling history. It was only recently that plausible mechanistic reasoning of the memory effect in Li-ion batteries was proposed. However, the existing literature does still not consistently reveal a phenomenological background for the onset or absence of the memory effect. This paper provides strong experimental and theoretical evidence of the memory effect in phase separating Li-ion battery cathode materials. Specifically, the background leading to the onset or absence of the memory effect and the underlying causal chain of phenomena from the collective particle-by-particle intra-electrode phenomena to macroscopic voltage output of the battery are presented and discussed. The results, clearly reveal that no memory effect is observed and predicted for low cut off voltages, whereas the absence of the first rest in memory writing cycle does not result in the absence of the memory effect, as previously believed. In addition, excellent agreement between the simulated and measured results is shown which, on one hand confirms the credibility of the combined analyses and, on the other, provides clear causal relations from macroscopic experimental parameters to simulated phenomena on the particle level.

Keywords

Li-ion battery;phase separating material;multi-particle porous electrode;memory effect;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 621.352(045)
COBISS: 16934939 Link will open in a new window
ISSN: 0039-2480
Parent publication: Strojniški vestnik
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Other data

Secondary language: Slovenian
Secondary title: Termodinamsko ozadje spominskega efekta v katodnih materialih s fazno separacijo
Secondary keywords: litij ionske baterije;spominski efekt;katodni material s fazno separacijo;večdelčna porozna elektroda;
Type (COBISS): Article
Pages: str. 690-700, SI 88
Volume: ǂVol. ǂ65
Issue: ǂno. ǂ11/12
Chronology: Nov.-Dec. 2019
DOI: 10.5545/sv-jme.2019.6366
ID: 11394023