Effects of cycling on lithium-ion battery hysteresis and overvoltage
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hdl:2117/180886
Tipus de documentArticle
Data publicació2019-10-16
EditorNature
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
Currently, lithium-ion batteries are widely used as energy storage systems for mobile applications.
However, a better understanding of their nature is still required to improve battery management
systems (BMS). Overvoltages and open-circuit voltage (OCV) hysteresis provide valuable information
regarding battery performance, but estimations of these parameters are generally inaccurate, leading
to errors in BMS. Studies on hysteresis are commonly avoided because the hysteresis depends on
the state of charge and degradation level and requires time-consuming measurements. We have
investigated hysteresis and overvoltages in Li(NiMnCo)O2/graphite and LiFePO4/graphite commercial
cells. Here we report a direct relationship between an increase in OCV hysteresis and an increase in
charge overvoltage when the cells are degraded by cycling. We fnd that the hysteresis is related to
difusion and increases with the formation of pure phases, being primarily related to the graphite
electrode. These fndings indicate that the graphite electrode is a determining factor for cell efciency.
CitacióOvejas, V.; Cuadras, A. Effects of cycling on lithium-ion battery hysteresis and overvoltage. "Scientific reports", 16 Octubre 2019, vol. 9, núm. 14875, p. 1-9.
ISSN2045-2322
Versió de l'editorhttps://www.nature.com/articles/s41598-019-51474-5.pdf
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effects of cycling.pdf | 1,291Mb | Visualitza/Obre |