Abstract Li4Ti5O12 (LTO) with a spinel structure is attractive as a promising anode for lithium-ion batteries due to a high charge/discharge voltage versus Li/Li+ and almost no volumetric expansion with improved cycle performance. In this study, a sea urchin-like nanostructured LTO (F-LTO) was prepared in the presence of F-127 as a surfactant. The morphology and structure of the samples were confirmed using field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) method. To investigate the electrochemical properties of the samples, charging/discharging analysis was performed for 1000 cycles at a high current density. F-LTO showed an improved capacity retention rate and a high average capacity compared to the LTO sample prepared in the absence of F-127. It was found that, when using the high-rate performance analysis at different charging/discharging current densities, the intercalation of Li+ ion to an electrode might be a crucial factor to reduce capacity and energy density. Due to its porous nanostructure with high specific area, F-LTO showed low polarization and improved kinetic properties, resulting in enhanced LIB performance including high energy density and cycling properties.

中文翻译：

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海胆状Li 4 Ti 5 O 12 纳米结构作为具有高能量密度和改善离子传输的锂离子电池负极

摘要 具有尖晶石结构的 Li4Ti5O12 (LTO) 作为一种很有前途的锂离子电池负极，由于其相对于 Li/Li+ 的高充放电电压和几乎没有体积膨胀以及改善的循环性能而具有吸引力。在这项研究中，在作为表面活性剂的 F-127 存在下制备了一种类似海胆的纳米结构 LTO（F-LTO）。使用场发射扫描电子显微镜（FE-SEM）和X射线衍射（XRD）方法确认样品的形貌和结构。为了研究样品的电化学性能，在高电流密度下进行了 1000 次循环充电/放电分析。与在没有 F-127 的情况下制备的 LTO 样品相比，F-LTO 显示出改进的容量保持率和高平均容量。结果发现，在不同充电/放电电流密度下使用高倍率性能分析时，锂离子嵌入电极可能是降低容量和能量密度的关键因素。由于其具有高比表面积的多孔纳米结构，F-LTO 显示出低极化和改进的动力学性能，从而增强了 LIB 性能，包括高能量密度和循环性能。