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Composite with TiO2 and extension of discharge voltage range for capacity enhancement of a Li4Ti5O12 battery

机译：TiO 2 复合材料和放电电压范围的扩展，以增强Li 4 Ti 5 O 12 电池的容量

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Herein, nanosheet-assembled Li4Ti5O12–TiO2 (LTO–TiO2) microspheres were successfully obtained via a hydrothermal method. The structure and morphology of the composite were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Subsequently, the electrochemical performance of the product was determined by an electrochemical workstation and a LAND CT2001A (Land, China) battery testing system. The experimental results demonstrated that both the formation of a composite with anatase TiO2 and the extension of the discharge voltage range were beneficial for the enhancement of the specific capacity of Li4Ti5O12. When the discharge cut-off voltage was decreased to 0 V, the LTO–TiO2 composites exhibited a higher discharge specific capacity of 411.3 mA h g?1 during the first cycle in comparison with pure LTO, which was mainly attributed to the intercalation of more lithium ions into the LTO–TiO2 composites at a low potential (<1.0 V). Moreover, owing to the introduction of anatase TiO2, the Li+ charge/discharge process at a higher potential of around 2.0 V (vs. Li/Li+) was also favorable for the enhancement of the capacity of LTO composites and their applied voltage range. In addition, the LTO–TiO2 composites exhibited high electronic conductivity and lithium ion diffusion coefficients and excellent coulombic efficiency.
机译：此处，纳米片组装的Li 4 Ti 5 O 12 <通过成功获得了/ small> –TiO 2 （LTO–TiO 2 ）微球。 em>水热法。使用X射线衍射（XRD），场发射扫描电子显微镜（SEM）和透射电子显微镜（TEM）表征复合材料的结构和形态。随后，通过电化学工作站和LAND CT2001A（中国大陆）电池测试系统确定了产品的电化学性能。实验结果表明，锐钛矿型TiO 2 复合物的形成和放电电压范围的扩展均有利于提高Li 4 Ti 5 O 12 。当放电截止电压降至0 V时，LTO-TiO 2 复合材料的放电比容量更高，为411.3 mA hg ？与纯LTO相比，在第一个循环中有1 ，这主要归因于更多的锂离子嵌入LTO-TiO 2 低电位（<1.0 V）的复合材料。此外，由于引入了锐钛矿型TiO 2 ，Li + 的充放电过程具有较高的电势。约2.0 V（ vs。 Li / Li + ）也有利于增强LTO复合材料的容量及其施加的电压范围。另外，LTO-TiO 2 复合材料具有较高的电子电导率和锂离子扩散系数，库仑效率极高。

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