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EnglishLiCoPO4(LCP) is a promising candidate as alternative cathode for high-voltage lithium-ion batteries. However, its practical electrochemical performances are still far from the theoretical data likely due to the low electronic and ionic conductivities. Moreover LCP typically suffers a rapid capacity fading upon cycling, probably due to structural degradations and electrolyte decomposition at 5 V vs. Li+/Li. Previous studies showed that carbon coating and metal doping may improve LCP electrochemical properties. In this work we report: (a) the fine tuning of a novel synthetic route at low temperature to obtain micrometric LCP crystallites morphologically homogeneous and crystallographically pure; (b) the analysis of the effect of iron doping on LCP structural features and electrochemical properties in lithium cell; (c) the beneficial simultaneous effect of iron doping and post-synthesis high-temperature annealing on the electrochemical performances in Li cells. The optimized material shows a reversible capacity of 120 mAh g-1at 0.1C rate and a capacity retention of 78% after 20 cycles.
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| Data di pubblicazione: | 2015 | |
| Titolo: | Effect of the iron doping in LiCoPO4cathode materials for lithium cells | |
| Autori: | Di Lecce, Daniele; Manzi, Jessica; Vitucci, Francesco M.; De Bonis, Angela; Panero, Stefania; Brutti, Sergio | |
| Rivista: | ELECTROCHIMICA ACTA | |
| Parole Chiave: | Fe doping; High-voltage cathodes; LiCoPO4; Lithium batteries; Solvo-thermal synthesis; Chemical Engineering (all); Electrochemistry | |
| Abstract in inglese: | LiCoPO4(LCP) is a promising candidate as alternative cathode for high-voltage lithium-ion batteries. However, its practical electrochemical performances are still far from the theoretical data likely due to the low electronic and ionic conductivities. Moreover LCP typically suffers a rapid capacity fading upon cycling, probably due to structural degradations and electrolyte decomposition at 5 V vs. Li+/Li. Previous studies showed that carbon coating and metal doping may improve LCP electrochemical properties. In this work we report: (a) the fine tuning of a novel synthetic route at low temperature to obtain micrometric LCP crystallites morphologically homogeneous and crystallographically pure; (b) the analysis of the effect of iron doping on LCP structural features and electrochemical properties in lithium cell; (c) the beneficial simultaneous effect of iron doping and post-synthesis high-temperature annealing on the electrochemical performances in Li cells. The optimized material shows a reversible capacity of 120 mAh g-1at 0.1C rate and a capacity retention of 78% after 20 cycles. | |
| Digital Object Identifier (DOI): | 10.1016/j.electacta.2015.10.107 | |
| Handle: | http://hdl.handle.net/11392/2385939 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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