Novel vanadium-doped olivine-like nanomaterials with high electronic conductivity
PBN-AR
Instytucja
Wydział Fizyki (Politechnika Warszawska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Solid State Ionics
ISSN
0167-2738
EISSN
Wydawca
Elsevier BV - North-Holland
DOI
Rok publikacji
2013
Numer zeszytu
Strony od-do
40-46
Numer tomu
251
Identyfikator DOI
Liczba arkuszy
0.5
Autorzy
Pozostali autorzy
+ 1
Autorzy przekładu
(liczba autorów przekładu: 0)
Słowa kluczowe
en
Nanomaterials; Olivines; LiFePO4–V2O5 glasses; Conductivity enhancement; Cathode materials
Streszczenia
Język
en
Treść
Olivine-like lithium iron phosphate (LiFePO4) is the most studied cathode material for a new generation of commercial Li-ion batteries. In this work we have studied the effect of thermal nanocrystallization on the electronic conductivity of the LiFe0.75V0.10PO4 glasses. The electrical conductivity of the as-prepared glass extrapolated to room temperature was as low as 10- 12 S · cm- 1. An appropriate thermal treatment of the glass led, however, to an immense increase in its electrical conductivity (up to 10- 3 S · cm- 1) and to a decrease in the activation energy from 1.0 eV for a freshly synthesized material to 0.17 eV after heat treatment. In the best conducting sample a large number of 5 ÷ 10 nm nanocrystallites of LiFePO4 were observed by SEM, STEM and HRTEM techniques. We ascribe the immense increase in the conductivity to especially advantageous conditions for polaron hopping between aliovalent iron and/or vanadium ions, created during the thermally induced microstructural changes. No traces of metallic impurities (such e.g., Fe2P) were found, but some presence of an electrochemically active Li3V2(PO4)3 phase was detected by XRD. © 2013 Elsevier B.V. All rights reserved.
Inne
System-identifier
WUT266564
CrossrefMetadata from Crossref logo
Cytowania
Liczba prac cytujących tę pracę
Brak danych
Referencje
Liczba prac cytowanych przez tę pracę
Brak danych