The influence of synthesis conditions on the redox behaviour of LiFePO4 in aqueous solution
Само за регистроване кориснике
2019
Аутори
Georgijević, RadovanVujković, Milica
Gutić, Sanjin J.
Aliefendić, Meho
Jugović, Dragana
Mitrić, Miodrag
Đokić, Veljko R.
Mentus, Slavko V.
Чланак у часопису (Објављена верзија)
,
© 2018 Elsevier B.V.
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To contribute to the knowledge on the influence of synthesis procedure on the intercalation kinetics of lithium ions into phospho-olivines, LiFePO4/C composite samples (LFPC) were synthesized in two ways, the first one in a sol-gel procedure (SG), and the other in a solid-state reaction (SS). The X-ray diffractograms (XRD) of both samples overlapped with that of pure LiFePO4, taken from the crystallographic database. Scanning electron microscopy pictures indicated the high degree of interparticle sintering, which caused a considerable agglomerate growth. The results of potentiodynamic measurements in aqueous LiNO3 solution revealed that for SS sample, three times higher initial capacity from that of SG one, (amounting to 74 mAh g−1 at 5 mV s−1). However, capacity fade on rising scan rate is much more expressed for SS sample than for SG one. We suggest that a different degree of material utilization due to the incomplete coverage of olivine particles by carbon explains this difference. ...The technique of separation of diffusion and capacitance currents was applied in a kinetic analysis, but it was shown to be inappropriate. We suggest the inapplicability of classic CV theory to the intercalation system accompanied by phase transition. Instead, a model of ohmic resistance determination of process kinetics was considered. LFPC-SS sample delivers three times larger capacity in LiNO3, amounting to 74 mAh g−1 at 1 mV s−1.
Кључне речи:
Olivine LiFePO4 / Aqueous electrolyte / Kinetics of lithium redox behaviourИзвор:
Journal of Alloys and Compounds, 2019, 776, 475-485Финансирање / пројекти:
- Литијум-јон батерије и горивне ћелије-истраживање и развој (RS-45014)
- Магнетни и радионуклидима обележени наноструктурни материјали за примене у медицини (RS-45015)
- Синтеза, развој технологија добијања и примена наноструктурних мултифункционалних материјала дефинисаних својстава (RS-45019)
- Молекуларно дизајнирање наночестица контролисаних морфолошких и физичко-хемијских карактеристика и функционалних материјала на њиховој основи (RS-45004)
- Bilateral project Serbia-Slovenia “Developments of novel materials for alkaline-ion batteries”
- Serbian Academy of Sciences and Arts “Electrocatalysis in the contemporary process of energy conversion”
DOI: 10.1016/j.jallcom.2018.10.246
ISSN: 0925-8388
WoS: 000453826200054
Scopus: 2-s2.0-85055737904
Колекције
Институција/група
VinčaTY - JOUR AU - Georgijević, Radovan AU - Vujković, Milica AU - Gutić, Sanjin J. AU - Aliefendić, Meho AU - Jugović, Dragana AU - Mitrić, Miodrag AU - Đokić, Veljko R. AU - Mentus, Slavko V. PY - 2019 UR - https://vinar.vin.bg.ac.rs/handle/123456789/7936 AB - To contribute to the knowledge on the influence of synthesis procedure on the intercalation kinetics of lithium ions into phospho-olivines, LiFePO4/C composite samples (LFPC) were synthesized in two ways, the first one in a sol-gel procedure (SG), and the other in a solid-state reaction (SS). The X-ray diffractograms (XRD) of both samples overlapped with that of pure LiFePO4, taken from the crystallographic database. Scanning electron microscopy pictures indicated the high degree of interparticle sintering, which caused a considerable agglomerate growth. The results of potentiodynamic measurements in aqueous LiNO3 solution revealed that for SS sample, three times higher initial capacity from that of SG one, (amounting to 74 mAh g−1 at 5 mV s−1). However, capacity fade on rising scan rate is much more expressed for SS sample than for SG one. We suggest that a different degree of material utilization due to the incomplete coverage of olivine particles by carbon explains this difference. The technique of separation of diffusion and capacitance currents was applied in a kinetic analysis, but it was shown to be inappropriate. We suggest the inapplicability of classic CV theory to the intercalation system accompanied by phase transition. Instead, a model of ohmic resistance determination of process kinetics was considered. LFPC-SS sample delivers three times larger capacity in LiNO3, amounting to 74 mAh g−1 at 1 mV s−1. T2 - Journal of Alloys and Compounds T1 - The influence of synthesis conditions on the redox behaviour of LiFePO4 in aqueous solution VL - 776 SP - 475 EP - 485 DO - 10.1016/j.jallcom.2018.10.246 ER -
@article{ author = "Georgijević, Radovan and Vujković, Milica and Gutić, Sanjin J. and Aliefendić, Meho and Jugović, Dragana and Mitrić, Miodrag and Đokić, Veljko R. and Mentus, Slavko V.", year = "2019", abstract = "To contribute to the knowledge on the influence of synthesis procedure on the intercalation kinetics of lithium ions into phospho-olivines, LiFePO4/C composite samples (LFPC) were synthesized in two ways, the first one in a sol-gel procedure (SG), and the other in a solid-state reaction (SS). The X-ray diffractograms (XRD) of both samples overlapped with that of pure LiFePO4, taken from the crystallographic database. Scanning electron microscopy pictures indicated the high degree of interparticle sintering, which caused a considerable agglomerate growth. The results of potentiodynamic measurements in aqueous LiNO3 solution revealed that for SS sample, three times higher initial capacity from that of SG one, (amounting to 74 mAh g−1 at 5 mV s−1). However, capacity fade on rising scan rate is much more expressed for SS sample than for SG one. We suggest that a different degree of material utilization due to the incomplete coverage of olivine particles by carbon explains this difference. The technique of separation of diffusion and capacitance currents was applied in a kinetic analysis, but it was shown to be inappropriate. We suggest the inapplicability of classic CV theory to the intercalation system accompanied by phase transition. Instead, a model of ohmic resistance determination of process kinetics was considered. LFPC-SS sample delivers three times larger capacity in LiNO3, amounting to 74 mAh g−1 at 1 mV s−1.", journal = "Journal of Alloys and Compounds", title = "The influence of synthesis conditions on the redox behaviour of LiFePO4 in aqueous solution", volume = "776", pages = "475-485", doi = "10.1016/j.jallcom.2018.10.246" }
Georgijević, R., Vujković, M., Gutić, S. J., Aliefendić, M., Jugović, D., Mitrić, M., Đokić, V. R.,& Mentus, S. V.. (2019). The influence of synthesis conditions on the redox behaviour of LiFePO4 in aqueous solution. in Journal of Alloys and Compounds, 776, 475-485. https://doi.org/10.1016/j.jallcom.2018.10.246
Georgijević R, Vujković M, Gutić SJ, Aliefendić M, Jugović D, Mitrić M, Đokić VR, Mentus SV. The influence of synthesis conditions on the redox behaviour of LiFePO4 in aqueous solution. in Journal of Alloys and Compounds. 2019;776:475-485. doi:10.1016/j.jallcom.2018.10.246 .
Georgijević, Radovan, Vujković, Milica, Gutić, Sanjin J., Aliefendić, Meho, Jugović, Dragana, Mitrić, Miodrag, Đokić, Veljko R., Mentus, Slavko V., "The influence of synthesis conditions on the redox behaviour of LiFePO4 in aqueous solution" in Journal of Alloys and Compounds, 776 (2019):475-485, https://doi.org/10.1016/j.jallcom.2018.10.246 . .