Effects of Li/Ti ratios on the electrochemical properties of Li4Ti5O12 examined by time-resolved X-ray diffraction

Title
Effects of Li/Ti ratios on the electrochemical properties of Li4Ti5O12 examined by time-resolved X-ray diffraction
Author(s)
신진욱[신진욱]정경윤[정경윤]류지헌[류지헌]박인욱[박인욱]윤당혁
Keywords
LITHIUM-ION BATTERIES; SIZED RUTILE TIO2; ANODE MATERIAL; TITANIUM-OXIDE; ANATASE; SPINEL; DIFFUSION; INSERTION; ELECTRODE; TRANSFORMATION
Issue Date
201206
Publisher
SPRINGER
Citation
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, v.107, no.4, pp.769 - 775
Abstract
Li4Ti5O12 for anodic active material of lithium ion batteries is synthesized using different Li/Ti ratios of 3.5/5.0, 4.0/5.0 and 4.5/5.0 by a solid-state reaction between Li2CO3 and anatase TiO2 at 850 A degrees C. All samples contain a small amount of transformed rutile TiO2 in the final Li4Ti5O12, where the amount of rutile TiO2 decreases with the increase in Li/Ti ratio. A stoichiometric Li4Ti5O12 with Li/Ti = 4.0/5.0 shows a slightly larger particle size and higher charge capacity than those of Li-deficient and Li-excessive particles, while the discharging rate capability is shown to mainly depend on particle size regardless of Li/Ti ratio. According to the time-resolved X-ray diffraction patterns using a synchrotron source, however, no significant difference is found in spite of the difference in Li/Ti ratio, indicating the structural stability of Li4Ti5O12 during the Li insertion and extraction process.
URI
http://hdl.handle.net/YU.REPOSITORY/28107http://dx.doi.org/10.1007/s00339-012-6912-8
ISSN
0947-8396
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공과대학 > 신소재공학부 > Articles
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