Uniformly dispersed self-assembled growth of Sb₂O₃/Sb@graphene nanocomposites on a 3D carbon sheet network for high Na-storage capacity and excellent stability

Abstract

A novel nanostructure comprised of Sb2O3/Sb@graphene NPs anchored on a carbon sheet network is reported, with excellent cycling stability, a long cycle life and a good rate capability as a sodium ion battery anode.

Micro/Nanostructure‐Dependent Electrochemical Performances of Sb2O3 Micro‐Bundles as Anode Materials for Sodium‐Ion Batteries

“…Firstly, cyclic voltammetry (CV) curves of the initial four cycles were provided to evaluate the sodiation/desodiation mechanism of Sb 2 O 3 micro‐bundles. As seen in Figure a, the first reduction process displays one intense irreversible peak at 0.1‐0.6 V, which is attributed to the decomposition of electrolytes to form solid‐electrolyte interphase (SEI) films and the alloying reaction of Sb with Na (Sb+x Na + +x e − →Na x Sb, x=1–3) . Meanwhile, the following oxidation process indicates the consecutive dealloying reaction and reconversion behavior, including the extraction of Na + from the alloy (∼0.793 V) and the oxidation of Sb into Sb 2 O 3 (with the wide peak at 1.2–2.2 V) .…”

Mesoporous Graphitic Carbon‐Encapsulated Fe2O3 Nanocomposite as High‐Rate Anode Material for Sodium‐Ion Batteries

“…Although most of them exhibit good cyclability, their low reversible capacities (often below 300 mA h g −1 ) are still a great limitation, not to mention the rate capabilities . By contrast, transition‐metal oxides based on alloying (e.g., SnO 2 and Sb 2 O 3 ) or conversion mechanisms (e.g., Fe 2 O 3 and Co 3 O 4 ) with high theoretical capacities seem to be remedies for this problem. Among these, Fe 2 O 3 is considered as a promising anode material because of its high theoretical capacity (≈1007 mA h g −1 ), abundance, low cost, and environmental benignity, and has been investigated widely in LIBs with various nanostructures .…”

Sb Nanoparticles Encapsulated in a Reticular Amorphous Carbon Network for Enhanced Sodium Storage

“…For example, Sb/C nanofibers, mechanically milled Sb/C nanocomposites, and peapod‐like Sb/C have been shown to improved cyclability and rate capability . Another possible approach to buffer the volume change is to integrate Sb with various dimensionalities porous carbon, such as 1D carbon nanotubes (CNTs), 2D graphene, and Sb/2D carbon nanosheets . But to date, the design of Sb/3D carbon composite as anode for NIBs has not been reported.…”