Electrochemical Properties of Pristine and Vanadium Doped LiFePO 4 Nanocrystallized Glasses

Justyna E. Frąckiewicz, Tomasz K. Pietrzak, Maciej Boczar, Dominika A. Buchberger, Marek Wasiucionek, Andrzej Czerwiński and Jerzy E. Garbarczyk
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Justyna E. Frąckiewicz: Faculty of Physics, Warsaw University of Technology, 00-662 Warsaw, Poland
Tomasz K. Pietrzak: Faculty of Physics, Warsaw University of Technology, 00-662 Warsaw, Poland
Maciej Boczar: Faculty of Chemistry, University of Warsaw, 02-093 Warsaw, Poland
Dominika A. Buchberger: Faculty of Chemistry, University of Warsaw, 02-093 Warsaw, Poland
Marek Wasiucionek: Faculty of Physics, Warsaw University of Technology, 00-662 Warsaw, Poland
Andrzej Czerwiński: Faculty of Chemistry, University of Warsaw, 02-093 Warsaw, Poland
Jerzy E. Garbarczyk: Faculty of Physics, Warsaw University of Technology, 00-662 Warsaw, Poland

Energies, 2021, vol. 14, issue 23, 1-10

Abstract: In our recent papers, it was shown that the thermal nanocrystallization of glassy analogs of selected cathode materials led to a substantial increase in electrical conductivity. The advantage of this technique is the lack of carbon additive during synthesis. In this paper, the electrochemical performance of nanocrystalline LiFePO 4 (LFP) and LiFe 0.88 V 0.08 PO 4 (LFVP) cathode materials was studied and compared with commercially purchased high-performance LiFePO 4 (C-LFP). The structure of the nanocrystalline materials was confirmed using X-ray diffractometry. The laboratory cells were tested at a wide variety of loads ranging from 0.1 to 3 C-rate. Their performance is discussed with reference to their microstructure and electrical conductivity. LFP exhibited a modest electrochemical performance, while the gravimetric capacity of LFVP reached ca. 100 mAh/g. This value is lower than the theoretical capacity, probably due to the residual glassy matrix in which the nanocrystallites are embedded, and thus does not play a significant role in the electrochemistry of the material. The relative capacity fade at high loads was, however, comparable to that of the commercially purchased high-performance LFP. Further optimization of the crystallites-to-matrix ratio could possibly result in further improvement of the electrochemical performance of nanocrystallized LFVP glasses.

Keywords: cathode materials; Li-ion batteries; thermal nanocrystallization; glassy analogs; gravimetric capacity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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