Effects of TiO2 Starting Materials on the Solid-State Formation of Li4Ti5O12

Title
Effects of TiO2 Starting Materials on the Solid-State Formation of Li4Ti5O12
Author(s)
신진욱[신진욱]홍창훈[홍창훈]윤당혁
Keywords
LITHIUM-ION BATTERIES; ELECTROCHEMICAL PERFORMANCE; ANODE MATERIAL; ANATASE; ELECTRODE; SPINEL; RUTILE; INSERTION; POWER; TRANSFORMATION
Issue Date
201206
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.95, no.6, pp.1894 - 1900
Abstract
This study examined the formation mechanism of Li4Ti5O12 by a solid-state reaction between Li2CO3 and TiO2 for applications in lithium ion batteries. To explain the intermittent existence of rutile TiO2 in the final Li4Ti5O12, five types of TiO2 which had different anatase/rutile ratios were used as starting materials. Anatase to rutile-phase transformation occurred from 600 degrees C, which is significantly lower than the typical TiO2 transition temperature, when a pure anatase TiO2 and Li2CO3 mixture were heat-treated. Moreover, this rutile TiO2 transformed from pure anatase TiO2 was found to be more rigid in the solid-state reaction than an intact rutile or anatase-rutile mixture, existing in the final Li4Ti5O12, even after heat treatment at 900 degrees C for 15 h. This difference is explained by the anatase/rutile-phase boundaries where an amorphous Li-precursor was located, enhancing the solid-state reaction due to the decreased diffusion path. Based on the observations, different formation mechanisms of Li4Ti5O12 depending on the types of TiO2 starting materials were proposed.
URI
http://hdl.handle.net/YU.REPOSITORY/28028http://dx.doi.org/10.1111/j.1551-2916.2012.05165.x
ISSN
0002-7820
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공과대학 > 신소재공학부 > Articles
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