Abstract
Memory effects in Li-ion battery materials have been explained on the basis of the thermodynamics of many-particles body, however the role of the (de-)intercalation kinetics is not yet clear. We demonstrate that kinetic aspects, specifically Li-ion mobility, are determining the magnitude of the memory effect in TiO2 by studying samples with different levels of oxygen vacancies.
Highlights
Memory effects in Li-ion battery materials have been explained on the basis of the thermodynamics of many-particles body, the role of theintercalation kinetics is not yet clear
We demonstrate that kinetic aspects, Li-ion mobility, are determining the magnitude of the memory effect in TiO2 by studying samples with different levels of oxygen vacancies
These batteries ‘‘memorize’’ the history ofcharge, e.g. depth of charge or discharge in previous cycles, and they behave differently according to that history.[1,2,3]. This effect has critical consequences on the performance of a battery as it interferes with the readings of the state of charge (SOC). This issue was believed to be overcome in Li-ion batteries (LIBs) since intercalation materials were reported not to suffer from memory effects, which was seen as one of the advantages of LIBs.[4]
Summary
Memory effects in Li-ion battery materials have been explained on the basis of the thermodynamics of many-particles body, the role of the (de-)intercalation kinetics is not yet clear. We demonstrate that kinetic aspects, Li-ion mobility, are determining the magnitude of the memory effect in TiO2 by studying samples with different levels of oxygen vacancies.
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