The thermal stability, local structure and electrical properties of lithium-iron phosphate glasses

• Autorzy: Jóźwiak P. , Garbarczyk J. E. , Wasiucionek M. , Gorzkowska I. , Gendron F. , Mauger A. , Julien C.
• Języki publikacji: EN

Abstrakty

EN

Amorphous analogues of lithium-iron phosphates (LFP), which are promising cathode materials for Li ion batteries, were prepared by the standard press-quenching method and their thermal stability, as well as structural and electrical properties, were studied for the first time. The glass transition temperature, Tg, determined by the differential thermal analysis (DTA) is composition-dependent and lies in the 492-523 °C range. The local structure, studied by the FTIR absorption spectroscopy, and the thermal stability are found to be almost insensitive to the lithium content. Studies on the electrical properties, carried out by impedance spectroscopy, have shown that the total electrical (predominantly polaronic) conductivity at 450 °C approaches 10-2 Socm-1. The room temperature conductivity of samples after their nanocrystallization (induced by annealing at the temperature of the beginning of crystallization) was higher by a factor of 4-10 (depending on composition) than that of the as-received glass. Therefore, nanocrystallization seems to be a promising way to enhance the electrical conductivity of amorphous lithium-iron phosphates.

Słowa kluczowe

EN

phospho-olivines; lithium-iron phosphate; glasses; cathode material; nanomaterial; infrared; spectroscopy; electron conduction

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2009
• Tom: Vol. 27, No. 1
• Strony: 307--318
• Opis fizyczny: Bibliogr. 19 poz.

Twórcy

autor

Jóźwiak P.

autor

Garbarczyk J. E.

autor

Wasiucionek M.

autor

Gorzkowska I.

autor

Gendron F.

autor

Mauger A.

autor

Julien C.

• Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

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