Lithium Intercalation Properties of Octatitanates Composed of Nanosheets with Various Dimensions
Lithium intercalation properties of octatitanates composed of nanosheets were examined. Several types of nanosheet-octatitanates were prepared by the reassembly of tetratitanate nanosheets in colloidal suspension, which were separated centrifugally at various revolutions, and then by a heat treatment. The colloidal suspension was obtained by the exfoliation of tetrabutylammonium tetratitanate intercalation compound. The capacities of the octatitanates composed of nanosheets were approximately 160 mAh/g, and they were maintained even after the exfoliation and the reassembly. The octatitanate composed of nanosheets with relatively small dimensions centrifugally separated at 6000 rpm exhibited a large capacity of 140 mAh/g at a relatively high current density of 1 A/g. The nanosheet process was found to be effective in improving the high rate capability.
Masaru Miyayama, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki
S. Suzuki and M. Miyayama, "Lithium Intercalation Properties of Octatitanates Composed of Nanosheets with Various Dimensions", Key Engineering Materials, Vol. 301, pp. 135-138, 2006