Amorphous carbon-encapsulated niobium oxide (a-C/T-Nb2O5) nanocomposites are synthesized by i) solvothermal reaction of NbCl5 with acetophenone, producing Nb2O5 nanocrystals (NCs) homogeneously coated by an organic C precursor, and ii) carbonization, with increase of the crystallinity degree of the Nb2O5 NCs. The C content and size of the Nb2O5 NCs can be controlled. The addition of assembly-promoting agents allows varying the morphology of the a-C/T-Nb2O5 nanostructures. The nanomaterials prepared under optimized conditions exhibit excellent rate performance, delivering a specific capacity of 90 mAh/g at 100 C rate and 125 mAh/g at 20 C rate in Li- and Na-ion batteries, respectively.
Amorphous C/T-Nb2O5 nanocomposites in Li- and Na-ion storage
Triolo C.;Santangelo S.
;
2020-01-01
Abstract
Amorphous carbon-encapsulated niobium oxide (a-C/T-Nb2O5) nanocomposites are synthesized by i) solvothermal reaction of NbCl5 with acetophenone, producing Nb2O5 nanocrystals (NCs) homogeneously coated by an organic C precursor, and ii) carbonization, with increase of the crystallinity degree of the Nb2O5 NCs. The C content and size of the Nb2O5 NCs can be controlled. The addition of assembly-promoting agents allows varying the morphology of the a-C/T-Nb2O5 nanostructures. The nanomaterials prepared under optimized conditions exhibit excellent rate performance, delivering a specific capacity of 90 mAh/g at 100 C rate and 125 mAh/g at 20 C rate in Li- and Na-ion batteries, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
