Three-Dimensional Coherent Titania鈥揗esoporous Carbon Nanocomposite and Its Lithium-Ion Storage Properties

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• 作者：Laifa Shen ; Evan Uchaker ; Changzhou Yuan ; Ping Nie ; Ming Zhang ; Xiaogang Zhang ; Guozhong Cao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：June 27, 2012
• 年：2012
• 卷：4
• 期：6
• 页码：2985-2992
• 全文大小：525K
• 年卷期：v.4,no.6(June 27, 2012)
• ISSN：1944-8252

文摘

Mesoporous, micro/nanosized TiO₂/C composites with uniformly dispersed TiO₂ nanoparticles embedded in a carbon matrix have been rationally designed and synthesized. In brief, TiO₂ precursor was infiltrated into the channels of surface-oxidized mesoporous carbon (CMK-3) by means of electrostatic interaction, followed by in situ hydrolysis and growth of TiO₂ nanocrystallites, resulting in ultrafine TiO₂ nanoparticle confined inside the channels of mesopores carbon. After chemical lithiation and post鈥揳nnealing, TiO₂ nanoparticles were transformed in situ into Li₄Ti₅O₁₂ to form highly conductivity mesoporous Li₄Ti₅O₁₂/C composite, as confirmed by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, and nitrogen sorption isotherms. By combining high electronic conductivity, open mesoporosity, and nanosized active material, coherent mesoporous TiO₂/C and Li₄Ti₅O₁₂/C nanocomposites demonstrated high rate capability and good cycling properties.

Keywords:

TiO₂; Li₄Ti₅O₁₂; ordered mesoporous structure; lithium ion batteries