; lij4@ornl.gov, Phone: þ01 912 4780850, Fax: þ01 912 4780699Highly porous Si/TiO 2 composite nanofibres were prepared using a unique sulphur-templating method combined with electrospinning. The structure, morphology, surface area, phase and composition of these nanofibres were characterized using Raman spectroscopy, scanning electron microscopy, powder X-ray diffraction, surface area analyser and thermogravimetric analyser. The specific surface area of Si/TiO 2 porous NFs is as large as 387 m 2 g
À1, whose silicon capacity can be maintained above 1580 mAh g À1 in 180 cycles.
Asymmetric porous structure formedviaa self-assembly phase inversion method can significantly improve the cycling performance of lithium ion anodes made of micron-size germanium powders.
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