Structurally and Electronically Designed TiO₂N_x Nanofibers for Lithium Rechargeable Batteries

Abstract

The morphology and electronic structure of metal oxides, including TiO(2) on the nanoscale, definitely determine their electronic or electrochemical properties, especially those relevant to application in energy devices. For this purpose, a concept for controlling the morphology and electrical conductivity in TiO(2), based on tuning by electrospinning, is proposed. We found that the 1D TiO(2) nanofibers surprisingly gave higher cyclic retention than 0D nanopowder, and nitrogen doping in the form of TiO(2)N(x) also caused further improvement. This is due to higher conductivity and faster Li(+) diffusion, as confirmed by electrochemical impedance spectra. Our findings provide an effective and scalable solution for energy storage efficiency.

Strategies for designing metal oxide nanostructures

“…Fig. 3h shows some examples of electrospun TiO2 nanofibers, ranging from solid fibers to single-channel and multiple-channel hollow nanofibers [144][145][146]. The solid fibers in Fig.…”

“…The solid fibers in Fig. 3h were fabricated by Kim et al [144], by a method in which a yellowish precursor solution containing TTIP, acetic acid, and 4.5 wt.% polyvinylpyrrolidone (PVP) was put into the syringe placed at a 9-cm distance from the 15 kV charged collection substrate with a feeding rate of 0.5 mL h −1 . The diameter of the nanofibers was around 100-200 nm after heating at 450°C for 1 h. The single channel TiO2 hollow nanofibers were prepared by simultaneous electrospinning of an ethanol solution containing PVP and TTIP, along with heavy mineral oil, from two coaxial capillaries.…”

Nanostructured electrode materials for lithium-ion and sodium-ion batteries via electrospinning

“…As shown in Fig. 13, nitridation [136,137], metal nanoparticles [138,139], and carbon matrix [140][141][142][143] were usually applied to enhance the electronic conductivity of TiO 2 nanofibers. Han et al [137] produced N-doped TiO 2 hollow nanofibers via one typical electrospinning process and subsequent nitridation process in the NH 3 atmosphere.…”

Hydrothermally Synthesized TiO2Nanoparticles as a Cathode Catalyst Material in Lithium-Oxygen Batteries

“…since they can give large surface-to-volume ratio, may shortens Li ion and O 2 gas diffusion length, and easily ensure e -contact point between catalysts and discharge product to facilitate the electrochemical reaction of electrode [17][18][19][20]. However, using a TiO 2 nanoparticles for the catalyst of lithium-oxygen batteries has been rarely reported in the literature even though it has promising attributes and have been widely investigated for the catalysts of various devices owing to its low cost, non-toxicity, eco-friendliness, and natural abundance [21][22][23][24][25].…”