A novel sandwich-like Co3O4/TiO2 composite with greatly enhanced electrochemical performance as anode for lithium ion batteries. (20th August 2015)

• Record Type: Journal Article
• Authors: Li, Wentao; Shang, Kaina; Liu, Yongmei; Zhu, Yanfei; Zeng, Ronghua; Zhao, Lingzhi; Wu, Yiwen; Li, Lin; Chu, Yinghong; Liang, Jinghao; Liu, Gang
• Is Part Of: Electrochimica acta. Volume 174(2015)
• Page Start: 985
• Page End: 991
• Publication Date: 2015-08-20
• Subjects: Sandwich-like structure -- Co3O4/TiO2 composite -- Anode material -- Li-ion batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.06.075
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: An unprecedented unique sandwich-like Co3 O4 /TiO2 composite, which combines the advantages of big porous Co3 O4 cube-like structure consisted of nanosheets and small TiO2 nanospindles, was fabricated through a facile hydrothermal method. The sandwich-like structure manifested superior cyclic performance. Highlights: An unprecedented unique sandwich-like Co3 O4 /TiO2 composite was fabricated through a facile hydrothermal method. The composite exhibits superior performance in terms of rate capability and cycle stability. The sandwich-like morphology with high surface to volume ratio provides more buffering space for volume expansion and more pores for facilitating lithium storage. Abstract: An unprecedented unique sandwich-like Co3 O4 /TiO2 composite (SCT), for which TiO2 nanospindles are embedded inside the porous cube-like structures stacked from Co3 O4 nanosheets, was fabricated through a facile hydrothermal method. The composition and morphology were characterized by X-Ray Diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Energy-Dispersive X-Ray Spectroscopy (EDS). The SCT electrode manifested excellent electrochemical performance with a capacity retention of 668 mAh g −1 after 120 cycles at 100 mA g −1, and 785 mAh g −1 after 60 cycles tested successively at 100, 300, 500, 1000, 500, 100 mA g −1 (each for 10 cycles), which is better than that of the prepared pristine Co3 O4 electrode. The unique sandwich-like structure is responsible for the enhanced electrochemical performance.