화학공학소재연구정보센터
Journal of Colloid and Interface Science, Vol.504, 230-237, 2017
Binding SnO2 nanoparticles onto carbon nanotubes with assistance of amorphous MoO3 towards enhanced lithium storage performance
We report the synthesis of a novel SnO2/MoO3/carbon nanotubes (CNTs) hybrid (denote as SMC) via hydrothermally treating aqueous SnC14-Na2Mo04-CNTs suspension. The hydrolysis of SnCl4 promotes the precipitation of Na2MoO4, resulting in the simultaneous coprecipitation of the amorphous MoO3 and SnO2 nanoparticles which attach onto the CNTs (Note that no MoOx is produced in the absence of SnCl4). When used as anode materials for lithium ion batteries (LIBs), the as-prepared SMC hybrid delivers a high reversible capacities of 1032 and 887 mA h/g after 50 cycles at current densities of 200 and 500 mA/g, respectively, and still retains a reversible capacity of 496 mA h/g even after 200 cycles at a higher rate of 2 A/g, which shows much better lithium storage performance than that of the counterpart hybrid of SnO2/CNTs (denote as SC, with only 569 mA h/g after 50 cycles at 200 mA/g). The enhanced electrochemical performance of SMC can be attributed to a synergistic effect, namely, MoO3 not only confines SnO2 nanoparticles onto the CNTs but also brings additional lithium storage capacity, while the flexible conductive CNT networks facilitate the charge transfer and electrolyte diffusion. (C) 2017 Elsevier Inc. All rights reserved.