科研之友
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摘要
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.
- 出版日期2017
- 单位陕西科技大学
