Details
| Original language | English |
|---|---|
| Title of host publication | Diffusion in Materials - DIMAT2008 |
| Pages | 565-570 |
| Number of pages | 6 |
| Volume | 289-292 |
| Publication status | Published - 2009 |
| Event | 7th International Conference on Diffusion in Materials - Lanzarote, Spain Duration: 28 Oct 2008 → 31 Oct 2008 |
Abstract
Spinel-type structured Li4+xTi5O12 (0 ≤ x ≤ 3) is actually one of the most promising anode materials for Li ion batteries. In its nanostructured form it is already used in some commercially available Li ion batteries. As was recently shown by our group (Wilkening et al., Phys. Chem. Chem. Phys. 9 (2007) 1239), Li diffusivity in microcrystalline Li 4+xTi5O12 with x = 0 is rather slow. In the present contribution the Li conductivity in nanocrystalline samples of the electronic insulator Li 4Ti5O12 prepared by different routes is investigated using impedance spectroscopy. The mean crystallite size of the samples is about 20 nm. The ionic conductivity of nanocrystalline Li4Ti5O12 obtained by mechanical treatment is higher by about two orders of magnitude compared to that found for a material which was prepared following a sol-gel method. The latter resembles the behaviour of the microcrystalline sample with an average particle size in the μm range rather than that of a nanocrystalline ball milled one with a mean crystallite size of about than 20 nm. The larger conductivity of the ball milled sample is ascribed to a much higher defect density generated when the particle size is reduced mechanically.
Keywords
- Battery materials, Impedance spectroscopy, Lithium titanate, Structural disorder
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Radiation
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
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Diffusion in Materials - DIMAT2008. Vol. 289-292 2009. p. 565-570.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Li conductivity of nanocrystalline Li4Ti5O 12 prepared by a sol-gel method and high-energy ball milling
AU - Iwaniak, W.
AU - Fritzsche, J.
AU - Zukalová, M.
AU - Winter, R.
AU - Wilkening, M.
AU - Heitjans, P.
PY - 2009
Y1 - 2009
N2 - Spinel-type structured Li4+xTi5O12 (0 ≤ x ≤ 3) is actually one of the most promising anode materials for Li ion batteries. In its nanostructured form it is already used in some commercially available Li ion batteries. As was recently shown by our group (Wilkening et al., Phys. Chem. Chem. Phys. 9 (2007) 1239), Li diffusivity in microcrystalline Li 4+xTi5O12 with x = 0 is rather slow. In the present contribution the Li conductivity in nanocrystalline samples of the electronic insulator Li 4Ti5O12 prepared by different routes is investigated using impedance spectroscopy. The mean crystallite size of the samples is about 20 nm. The ionic conductivity of nanocrystalline Li4Ti5O12 obtained by mechanical treatment is higher by about two orders of magnitude compared to that found for a material which was prepared following a sol-gel method. The latter resembles the behaviour of the microcrystalline sample with an average particle size in the μm range rather than that of a nanocrystalline ball milled one with a mean crystallite size of about than 20 nm. The larger conductivity of the ball milled sample is ascribed to a much higher defect density generated when the particle size is reduced mechanically.
AB - Spinel-type structured Li4+xTi5O12 (0 ≤ x ≤ 3) is actually one of the most promising anode materials for Li ion batteries. In its nanostructured form it is already used in some commercially available Li ion batteries. As was recently shown by our group (Wilkening et al., Phys. Chem. Chem. Phys. 9 (2007) 1239), Li diffusivity in microcrystalline Li 4+xTi5O12 with x = 0 is rather slow. In the present contribution the Li conductivity in nanocrystalline samples of the electronic insulator Li 4Ti5O12 prepared by different routes is investigated using impedance spectroscopy. The mean crystallite size of the samples is about 20 nm. The ionic conductivity of nanocrystalline Li4Ti5O12 obtained by mechanical treatment is higher by about two orders of magnitude compared to that found for a material which was prepared following a sol-gel method. The latter resembles the behaviour of the microcrystalline sample with an average particle size in the μm range rather than that of a nanocrystalline ball milled one with a mean crystallite size of about than 20 nm. The larger conductivity of the ball milled sample is ascribed to a much higher defect density generated when the particle size is reduced mechanically.
KW - Battery materials
KW - Impedance spectroscopy
KW - Lithium titanate
KW - Structural disorder
UR - http://www.scopus.com/inward/record.url?scp=75349087464&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/DDF.289-292.565
DO - 10.4028/www.scientific.net/DDF.289-292.565
M3 - Conference contribution
AN - SCOPUS:75349087464
SN - 3908451728
SN - 9783908451723
VL - 289-292
SP - 565
EP - 570
BT - Diffusion in Materials - DIMAT2008
T2 - 7th International Conference on Diffusion in Materials
Y2 - 28 October 2008 through 31 October 2008
ER -