Abstract
A single-phase specimen of hollandite-type K0.008TiO2 was synthesized by the ion extraction method using aqua regia treatment. Rietveld refinement from X-ray powder diffraction data for K0.008TiO2 showed it to have the hollandite-type structure (tetragonal; space group I4/m; a=10.1631(6) Å and c=2.9639(2) Å; Z=8). The K0.008TiO2 specimen worked as a rechargeable electrode material. An initial capacity of 161mAh/g (cut-off voltage: 1.0V) could be achieved, and the reversible capacity after 50 cycles was 147mAh/g. After lithium insertion–deinsertion cycling tests, the hollandite structure was still retained without structure collapse.
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