Novel vanadium-doped olivine-like nanomaterials with high electronic conductivity

Tomasz Pietrzak , Marek Wasiucionek , Irena Gorzkowska , Jan Nowiński , Jerzy Garbarczyk

Abstract

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.
Author Tomasz Pietrzak (FP / SSID)
Tomasz Pietrzak,,
- Solid State Ionics Division
, Marek Wasiucionek (FP / SSID)
Marek Wasiucionek,,
- Solid State Ionics Division
, Irena Gorzkowska (FC / CICSST)
Irena Gorzkowska,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Jan Nowiński (FP / SSID)
Jan Nowiński,,
- Solid State Ionics Division
, Jerzy Garbarczyk (FP / SSID)
Jerzy Garbarczyk,,
- Solid State Ionics Division
Journal seriesSolid State Ionics, ISSN 0167-2738
Issue year2013
Vol251
Pages40-46
Publication size in sheets0.5
Keywords in EnglishNanomaterials; Olivines; LiFePO4–V2O5 glasses; Conductivity enhancement; Cathode materials
ASJC Classification3104 Condensed Matter Physics; 2500 General Materials Science; 1600 General Chemistry
DOIDOI:10.1016/j.ssi.2013.02.012
URL http://www.sciencedirect.com/science/article/pii/S0167273813001008
Languageen angielski
File
1-s2.0-S0167273813001008-main.pdf 1.5 MB
Score (nominal)35
Score sourcejournalList
ScoreMinisterial score = 30.0, 01-01-2020, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 01-01-2020, ArticleFromJournal
Publication indicators WoS Citations = 16; Scopus Citations = 22; GS Citations = 5.0; Scopus SNIP (Source Normalised Impact per Paper): 2013 = 1.269; WoS Impact Factor: 2013 = 2.112 (2) - 2013=2.397 (5)
Citation count*5 (2015-05-15)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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