One-Pot Spray-Dried Graphene Sheets-Encapsulated Nano-Li4Ti5O12 Microspheres for a Hybrid BatCap System

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• 作者：Tao Yuan ; Wen-Ting Li ; Weimin Zhang ; Yu-Shi He ; Chunming Zhang ; Xiao-Zhen Liao ; Zi-Feng Ma
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：July 9, 2014
• 年：2014
• 卷：53
• 期：27
• 页码：10849-10857
• 全文大小：551K
• ISSN：1520-5045

文摘

In this study, we report a facile strategy for constructing three-dimensional (3D) crumpled graphene sheets-wrapped nano-Li₄Ti₅O₁₂ (LTO@GS) composites using a one-pot spray-drying assisted solid-phase reaction method with anatase TiO₂ as a starting material. The proportion of graphene oxide (GO) in the LTO@GS composite greatly influences the phase formation and electrochemical performance of the composite. As an anode material for a nonaqueous, hybrid battery-capacitor (BatCap) system, the LTO@GS composite exhibits good high-rate capability and long cycle life. The specific capacitance still retains 90% of the initial value after 20鈥?00 cycles, and the Coulombic efficiencies are close to 100%. This can reasonably be attributed to the interesting crumpled graphene-encapsulated structure and extraordinary synergistic effects between the two components.