Amorphous carbon coated TiO₂ nanocrystals embedded in a carbonaceous matrix derived from polyvinylpyrrolidone decomposition for improved Li-storage performance

详细信息    查看全文

• 作者：Junyao Shen ; Hai Wang ; Yeping Song ; Yu Zhou ; Naiqing Ye ; Liang Fang ; Linjiang Wang
• 关键词：TiO2 ; Lithium ion battery ; Nanocrystals ; Carbon ; Anode
• 刊名：Chemical Engineering Journal
• 出版年：15 March, 2014
• 年：2014
• 卷：240
• 期：Complete
• 页码：379-386
• 全文大小：3059 K

文摘

A facile method has been developed for the fabrication of TiO₂-C nanocomposite anode material, where a thin amorphous carbon layer is coated on the surface of TiO₂ nanocrystals for lithium-ion batteries (LIBs) application. To study the structure-property correlations, the effects of different carbon content and nanocrystals size of nanocomposites on the electrochemical properties of LIBs are systematically studied by post-calcination at various temperatures. Based on detailed experimental results, it is demonstrated that amorphous carbon-coated TiO₂ nanocrystals calcinated at 400 掳C show the best electrochemical performance as compared with its counterparts at 500 掳C and 600 掳C. At 400 掳C, the enhanced electronic conductivity from the decomposition of polyvinylpyrrolidone (PVP) seems to be the main reason for the improved capacity of TiO₂ nanocrystals-based LIBs. This unique architecture of anodes materials provides many important features for high-performance LIBs, such as fast ion transport and relatively high electrical conductivity, thus leading to the outstanding electrochemical performance of the electrodes. Such an electrode yields 228 mA h g^鈭? capacity (1 C = 170 mA g^鈭?) even after 100 cycles. This method is proven to be an effective technique for improving the electrochemical performance and stability of TiO₂ based anode electrodes, especially for nanocrystal electrodes application in LIBs.