Preparation of porous Si and TiO₂ nanofibres using a sulphur‐templating method for lithium storage

Abstract

; 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.

A Bioinspired Nanofibrous Titania/Silicon Composite as an Anode Material for Lithium‐Ion Batteries

“…Additionally, titania‐coated silicon nanowires, silicon nanospheres, and silicon nanotube composites with core–shell structures prepared through an atomic layer deposition (ALD) process showed remarkably improved performances when used as anode materials for LIBs . Furthermore, porous titania/silicon nanofibers composed of titania and silicon nanoparticles were prepared by a sulfur‐templating approach combined with electrospinning, with the aim of enhancing the anodic performances of LIBs . However, there still remains a challenge for the facile and cost‐effective fabrication of titania/silicon nanocomposites with high electrochemical performances, and good control of the degree of titania coverage and thickness of the titania coating layer outside the silicon substrate.…”

“…[36,46,47] Furthermore, poroust itania/siliconn anofibers composed of titania and silicon nanoparticles were prepared by as ulfur-templating approach combined with electrospinning, with the aim of enhancing the anodic performances of LIBs. [48] However, there still remains ac hallenge for the facile and cost-effective fabrication of titania/silicon nanocomposites with highe lectrochemical performances, andg ood control of the degree of titania coverage and thickness of the titaniac oating layer outside the silicon substrate.…”

Toward Low-Cost, High-Energy Density, and High-Power Density Lithium-Ion Batteries

“…6 Many daunting challenges need to be addressed for silicon and lithium anodes. These include the dramatic volume changes 7,8 and unstable solid electrolyte interphase (SEI) 9 for Si anodes, as well as the catastrophic failures associated with lithium dendrites forming on lithium anodes. 10 Therefore, cost reduction in the near term could come from improvements in cell manufacturing, learning rates for pack integration, and capturing increasing economics of scales.…”

A Hierarchical, Nanofibrous, Tin‐Oxide/Silicon Composite Derived from Cellulose as a High‐Performance Anode Material for Lithium‐Ion Batteries

“…Other effective approach proposed to improve the electrochemical performances of silicon‐based anodes is modifying silicon anodes with active matter or inactive matrix, such as carbon, metal, transition metal oxides, polymer, and so on. For examples, many attempts to combine silicon nanostructural materials with other metal silicide or metal oxide matters, such as titanium silicide, tin oxide,, titanium dioxide, molybdenum trioxide, nickel oxide, and cobalt oxide, have been taken for obtaining various composites with superior lithium storage properties by taking advantages of the silicon and the metal compound species. As one of the most prospective anode materials, tin oxide has been extensively studied due to its high lithium storage capacity (790 mAh g −1 ), safe lithiation potential, and low cost .…”