Ontology type: schema:ScholarlyArticle
2020-03-26
AUTHORSShanshan Yao, Ruiduo Guo, Zongzhen Wu, Mingquan Liu, Xinye Qian, Xiangqian Shen, Tianbao Li, Li Wang, Yanhua Wang, Shibiao Qin
ABSTRACTIn this paper, we report a facile approach to synthesize pure Magnéli phase Ti4O7 nanostructures via solvothermal processing and subsequent thermal treatment. The one-dimensional nanostructure of Ti4O7 nanorods (1D Ti4O7 NRs) was characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM) and high-resolution transmission electron microscopy (HRTEM). The as-obtained Ti4O7 NRs, with an average diameter of 150 nm, were used as sulfur host to prepare Ti4O7 NRs/sulfur cathode for lithium-sulfur (Li-S) batteries. Electrochemical measurements showed that the as-synthesized Ti4O7 NRs can improve the electrochemical reaction kinetics during the charge-discharge processes. The initial discharge capacity of the Ti4O7 NRs/sulfur cathode was 930 mAh g−1, and the remaining capacity was 490 mAh g−1 after 500 cycles at 1C, much higher than that of acetylene black/sulfur cathode. Electrochemical impedance spectroscopy (EIS) demonstrated Ti4O7 NRs/sulfur decreases the charge transfer resistance. Moreover, Ti4O7 NRs/sulfur composite exhibits low electrode polarization accompanied by a high lithium ion diffusion coefficient. More... »
PAGES154-162
http://scigraph.springernature.com/pub.10.1007/s10832-020-00206-7
DOIhttp://dx.doi.org/10.1007/s10832-020-00206-7
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