ABSTRACT
We report an amorphorization-hybridization strategy to enhance lithium storage by casting atomically mixed amorphorized SnO2/MoO3 into porous foam-like carbon nanoflakes (denote as SnO2/MoO3@CNFs, or SMC in short), which are simply prepared by annealing tin(II)/molybdenum(IV) 2-ethylhexanoate within CNFs under ambient atmosphere at a low temperature (300⯰C). The SnO2/MoO3 loading amount within CNFs can be easily adjusted by controlling the Sn/Mo/C precursors. When examined as lithium ion battery (LIB) anode materials, the amorphorized SnO2/MoO3@CNFs with carbon content of 32â¯wt% (also denote as SMC-32, in which the number represents the carbon content) deliver a high reversible capacity of 1120.5â¯mAâ¯h/g after 200 cycles at 200â¯mA/g and then 651.5â¯mAâ¯h/g after another 300 cycles at 2000â¯mA/g, which is much better than that of the crystalline SnO2/CNFs (carbon content of 34â¯wt%), MoO3/CNFs (carbon content of 22.7â¯wt%), or SnO2/MoO3@CNFs (with lower carbon contents of 11 and 25â¯wt%). The electrochemical measurements as well as the ex situ structure characterization clearly suggest that combination of amorphorization and hybridization of SnO2/MoO3 with CNFs synergistically contributes to the superior lithium storage performance with high pseudocapacitive contribution.