Structurally and Electronically Designed TiO2Nx Nanofibers for Lithium Rechargeable Batteries

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• 作者：Jae-Geun Kim ; Dongqi Shi ; Ki-Jeong Kong ; Yoon-Uk Heo ; Jung Ho Kim ; Mi Ru Jo ; Yoon Cheol Lee ; Yong-Mook Kang ; Shi Xue Dou
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：5
• 期：3
• 页码：691-696
• 全文大小：402K
• 年卷期：v.5,no.3(February 13, 2013)
• ISSN：1944-8252

文摘

The morphology and electronic structure of metal oxides, including TiO₂ 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 TiO₂, based on tuning by electrospinning, is proposed. We found that the 1D TiO₂ nanofibers surprisingly gave higher cyclic retention than 0D nanopowder, and nitrogen doping in the form of TiO₂N_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.

Keywords:

titanates; nitrogen doping; electrospinning; lithium ion batteries; 1D nanostructure; TiO₂N_x