Papers by Keyword: Octatitanate

Abstract: Composites of octatitanate and carbon-fibers were prepared through reassembling tetratitanate nanosheets, synthesized through exfoliation / reassembly process, by the reaction with HCl in colloidal suspension mixed with carbon- fibers, followed by heat treatment. High-rate lithium intercalation properties were examined for the reassembled octatitanate / carbon-fiber composites, and compared with those of reassembled octatitanate simply mixed with carbon-particles. The reversible capacity and the energy efficiency of the reassembled octatitanate / carbon-fiber composites were 190 mAh/g and 94 %, respectively, larger than those of a conventional octatitanate or a reassembled octatitanate. Relatively large capacity of 135 mAh/g still remained at a large current density of 10 A/g, which corresponds to about 70 % of the discharge capacity at a relatively small current density of 100 mA/g. Reassembled octatitanate / carbon- fiber composites exhibited an excellent performance as a high-rate lithium insertion electrode.

Abstract: 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.