High Volumetric Energy Density Lithium Ion Battery with Titania@Carbon Nanostructure Electrode

초록

In typical lithium ion batteries, anodes mainly contained active materials, a binder such as polyvinylidene fluoride (PVDF), and a conducting agent such as Ketjen black. In this study, we proposed a conducting agent-free electrode structure (f-TiO2@C) fabricated using TiO2@C, as an active material, with graphitic-like carbon shells and PVDF in the absence of the conducting material. For comparison, a conventional electrode (c-TiO2@C) was fabricated using TiO2@C and PVDF with the conducting material. In addition, the conducting agent-free and conventional electrode structures were prepared using TiO2, as an active material, heated at 800 degrees C in air atmosphere. The high discharge capacity and enhanced high rate cycling performance of the f-TiO2@C were attributed to the carbon shell in the TiO2@C, which might play a role as an efficient conducting agent for the high-performance lithium ion batteries. Furthermore, the f-TiO2@C as a conducting agent-free electrode exhibited much enhanced volumetric capacity and cycle life compared to the c-TiO2@C in the presence of 10 wt% Ketjen black as a conducting agent.

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