Synthesis and characterization of TiO2-coated magnetite clusters (nFe3O4@TiO2) as anode materials for Li-ion batteries
- Synthesis and characterization of TiO2-coated magnetite clusters (nFe3O4@TiO2) as anode materials for Li-ion batteries
- Sung-Eun Kim; Kun-Woo Kim; Sang-Wha Lee; 김상옥; 김정섭; 이중기
- Magnetite cluster; TiO2 capsule layer; Anode materials; Li-ion batteries
- Issue Date
- Current applied physics
- VOL 13, NO 9, 1923-1927
- TiO2-coated magnetite clusters (nFe3O4@TiO2) were facilely prepared through the solegel reaction between
Ti alkoxides (TEOT) and magnetite clusters (nFe3O4) with terminated alkoxy groups. The composite
particles represented a coreeshell nanostructure (nFe3O4@TiO2) consisting of a Fe3O4 cluster core
and a TiO2 capsule layer. The capsule layer of nFe3O4@TiO2 was increased with increasing amounts of
TEOT (150, 300, 500 μl) in solegel reaction. The Fe3O4@TiO2 (150 μl of TEOT) with a thin TiO2 layer (ca.
10 nm) exhibited two kinds of cathodic (0.79 V and 1.61 V) and anodic (1.78 and 2.1 V) peaks attributed
to the reduction and oxidation process by Fe3O4 core and TiO2 layer, respectively. The thin nFe3O4@TiO2
(150 μl of TEOT) exhibited the enhanced capacity retention by ca. 40% probably due to the buffering effect
of TiO2 capsule layer. However, the thick nFe3O4@TiO2 (300-500 μl of TEOT) exhibited a rapid capacity
fading due to the disintegrated coreeshell nanostructure, i.e., unfavorable hetero-junction between TiO2
matrix and magnetite clusters.
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