OCV Hysteresis in Li-Ion Batteries including Two-Phase Transition Materials

By M. Roscher, Oliver Bohlen, J. Vetter. 2011

146 citations recorded by the source corpus.

The relation between batteries' state of charge (SOC) and open-circuit voltage (OCV) is a specific feature of electrochemical energy storage devices. Especially NiMH batteries are well known to exhibit OCV hysteresis, and also several kinds of lithium-ion batteries show OCV hysteresis, which can be critical for reliable state estimation issues. Electrode potential hysteresis is known to result from thermodynamical entropic effects, mechanical stress, and microscopic distortions within the active electrode materials which perform a two-phase transition during lithium insertion/extraction. Hence, some Li-ion cells including two-phase transition active materials show pronounced hysteresis referring to their open-circuit voltage. This work points out how macroscopic effects, that is, diffusion limitations, superimpose the latte- mentioned microscopic mechanisms and lead to a shrinkage of OCV hysteresis, if cells are loaded with high current rates. To validate the mentioned interaction, Li-ion cells' state of charge is adjusted to 50% with various current rates, beginning from the fully charged and the discharged state, respectively. As a pronounced difference remains between the OCV after charge and discharge adjustment, obviously the hysteresis vanishes as the target SOC is adjusted with very high current rate.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/e28fbc050e4f58ba1234a177b3d8f7ce1f1e8954

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In Automotive Engineering

1. Najoua Essoukri Ben Amara
2. Bilal Manai
3. Sabeur Jemmali
4. Ines Baccouche
5. Noshin Omar

In Electrical and Electronic Engineering

1. Najoua Essoukri Ben Amara
2. Bilal Manai
3. Sabeur Jemmali
4. Ines Baccouche
5. Noshin Omar

Citations in the corpus

• Improved OCV Model of a Li-Ion NMC Battery for Online SOC Estimation Using the Extended Kalman Filter (2017, background): “This gap between the charge and discharge curves can be restrictive when it comes to estimating SOC [29,30].”