Improved electrochemical properties of Li4Ti5O12–Li0.33La0.56TiO3 composite anodes prepared by a solid-state synthesis.
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| Title: | Improved electrochemical properties of Li4Ti5O12–Li0.33La0.56TiO3 composite anodes prepared by a solid-state synthesis. |
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| Authors: | Zhu, Yan-Rong1, Yuan, Jing1, Zhu, Min1, Hao, Guodong2, Yi, Ting-Feng1 tfyihit@163.com, Xie, Ying3 xieying@hlju.edu.cn |
| Source: | Journal of Alloys & Compounds. Oct2015, Vol. 646, p612-619. 8p. |
| Subjects: | Lithium titanate, Electrochemical electrodes, Metallic composites, Chemical sample preparation, Solid state chemistry, Chemical synthesis |
| Abstract: | Li 4 Ti 5 O 12 –Li 0.33 La 0.56 TiO 3 composite anodes are successfully prepared by a facile solid state route. The structure, morphology and electrochemical performance of all samples are characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscope (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and charge–discharge tests, respectively. XRD reveals that the little La 3+ ions enter into the lattice, and then make the crystal lattice of Li 4 Ti 5 O 12 expand. SEM shows that all samples are composed of 1–2 μm primary particles with irregular shapes. CV and EIS imply that Li 4 Ti 5 O 12 –Li 0.33 La 0.56 TiO 3 composites have lower polarization, larger lithium-ion diffusion coefficient and smaller charge transfer resistance corresponding to a much higher conductivity than those of Li 4 Ti 5 O 12 corresponding to the extraction of Li + ions. The improved electrochemical performance of Li 4 Ti 5 O 12 –Li 0.33 La 0.56 TiO 3 composites can be attributed to the enhanced transfer kinetics of both the lithium ions and electrons. Particularly, Li 4 Ti 5 O 12 –Li 0.33 La 0.56 TiO 3 (5 wt.%) composite shows a excellent high-rate capability and cycling stability. Therefore, the present Li 4 Ti 5 O 12 –Li 0.33 La 0.56 TiO 3 (5 wt.%) composite anode is capable of large-scale applications, such as electric vehicles and hybrid electric vehicles, requiring high energy, long life and excellent safety. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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