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Sphere-like MoS2 and porous TiO2 composite film on Ti foil as lithium-ion battery anode synthesized by plasma electrolytic oxidation and magnetron sputtering
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2021-09-24 , DOI: 10.1016/j.jallcom.2021.162075
Menglu Sun 1, 2 , Jie Wu 1, 2 , Ping Lu 1, 2 , Zhonghua Zhang 1, 2 , Yifan Zhang 3 , Dejun Li 1, 2
Affiliation  

In this paper, a sphere-like MoS2 and porous TiO2 composite film was prepared on Ti foil by plasma electrolytic oxidation and magnetron sputtering methods. The prepared film was assembled as a binder-free anode in the lithium-ion battery and a Li foil served as the counter electrode. The specific capacity and cycling stability of the electrode were evaluated, together with the cyclic voltammograms and electrochemical impedance spectra. The TiO2/MoS2 composite film anode combined the advantages of TiO2 with high structural stability and MoS2 with high theoretical capacity. The electrochemical performance exhibited a specific capacity above 400 mAh g−1 at the current density of 100 µA cm−2, which was much higher than that of the TiO2 anode. Besides, after cycling under a high current density of 1000 μA cm−2, the capacity came back to 91% of the initial capacity, showing a good rate capability. The porous TiO2 prepared by plasma electrolytic oxidation can provide a significant number of internal channels for the Li+ diffusion, resulting in a high porosity of 33.5–41.6%, and a high Li+ diffusion coefficient of 3.12 × 10−14–6.67 × 10−14 cm2/s, which was beneficial for the enhanced electrochemical performance.



中文翻译:

等离子电解氧化和磁控溅射合成锂离子电池负极钛箔上的球形MoS2和多孔TiO2复合膜

本文采用等离子电解氧化和磁控溅射法在钛箔上制备了球形MoS 2和多孔TiO 2复合薄膜。将制备的薄膜组装为锂离子电池中的无粘合剂负极,锂箔作为对电极。评估了电极的比容量和循环稳定性,以及循环伏安图和电化学阻抗谱。TiO 2 /MoS 2复合膜负极结合了TiO 2结构稳定性高和MoS 2理论容量高的优点。电化学性能表现出高于 400 mAh g -1的比容量在 100 µA cm -2的电流密度下,远高于 TiO 2阳极的电流密度。此外,在1000 μA cm -2的高电流密度下循环后,容量恢复到初始容量的91%,显示出良好的倍率性能。通过等离子体电解氧化制备的多孔TiO 2可以为Li +扩散提供大量的内部通道,导致33.5-41.6%的高孔隙率和3.12 × 10 -14 -6.67 ×的高Li +扩散系数10 -14 cm 2 /s,有利于提高电化学性能。

更新日期:2021-09-30
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