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EnglishLiCoPO4(LCP) is a promising high voltage cathode for next-generation high energy Li-ion batteries. However, once electrochemically de-lithiated, it suffers from a spontaneous self-discharge process in open circuit conditions. Here we present our systematic study about the phase composition and structural changes of LCP electrodes upon charging and self-discharging processes by ex situ synchrotron X-ray diffraction and Fast-Fourier Transform Infrared Spectroscopy (FT-IR) analyses. Various initial charging states and different current rates have been studied. Our investigation highlights large structural alterations of the de-lithiated CoPO4phase upon self-discharge. However, after 160 hours with open circuit the pristine LCP structure is recovered. The electrochemically de-lithiated phase reincorporates lithium by a spontaneous reduction reaction releasing gaseous CO2and likely degrading the electrolyte molecules.
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| Data di pubblicazione: | 2015 | |
| Titolo: | Analysis of the self-discharge process in LiCoPO4electrodes: Bulks | |
| Autori: | Manzi, J.; Vitucci, F. M.; Paolone, A.; Trequattrini, F.; Di Lecce, D.; Panero, S.; Brutti, S. | |
| Rivista: | ELECTROCHIMICA ACTA | |
| Parole Chiave: | high voltage cathode; LiCoPO4; self-discharge; Synchrotron FT-IR; Synchrotron XRD; Chemical Engineering (all); Electrochemistry | |
| Abstract in inglese: | LiCoPO4(LCP) is a promising high voltage cathode for next-generation high energy Li-ion batteries. However, once electrochemically de-lithiated, it suffers from a spontaneous self-discharge process in open circuit conditions. Here we present our systematic study about the phase composition and structural changes of LCP electrodes upon charging and self-discharging processes by ex situ synchrotron X-ray diffraction and Fast-Fourier Transform Infrared Spectroscopy (FT-IR) analyses. Various initial charging states and different current rates have been studied. Our investigation highlights large structural alterations of the de-lithiated CoPO4phase upon self-discharge. However, after 160 hours with open circuit the pristine LCP structure is recovered. The electrochemically de-lithiated phase reincorporates lithium by a spontaneous reduction reaction releasing gaseous CO2and likely degrading the electrolyte molecules. | |
| Digital Object Identifier (DOI): | 10.1016/j.electacta.2015.03.071 | |
| Handle: | http://hdl.handle.net/11392/2385937 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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