Tin Dioxide@Carbon Core–Shell Nanoarchitectures Anchored on Wrinkled Graphene for Ultrafast and Stable Lithium Storage

Abstract

The SnO2@C@GS composites as a new type of 3D nanoarchitecture have been successfully synthesized by a facile hydrothermal process followed by a sintering strategy. Such a 3D nanoarchitecture is made up of SnO2@C core-shell nanospheres and nanochains anchored on wrinkled graphene sheets (GSs). Transmission electron microscopy shows that these core-shell nanoparticles consist of 3-9 nm diameter secondary SnO2 nanoparticles embedded in about 50 nm diameter primary carbon nanospheres. Large quantities of core-shell nanoparticles are uniformly attached to the surface of wrinkled graphene nanosheets, with a portion of them further connected into nanochains. This new 3D nanoarchitecture consists of two different kinds of carbon-buffering matrixes, i.e., the carbon layer produced by glucose carbonization and the added GS template, leading to enhanced lithium storage properties. The lithium-cycling properties of the SnO2@C@GS composite have been evaluated by galvanostatic discharge-charge cycling and electrochemical impedance spectroscopy. Results show that the SnO2@C@GS composite has discharge capacities of 883.5, 845.7, and 830.5 mA h g(-1) in the 20th, 50th and 100th cycles, respectively, at a current density of 200 mA g(-1) and delivers a desirable discharge capacity of 645.2 mA h g(-1) at a rate of 1680 mA g(-1). This new 3D nanoarchitecture exhibits a high capability and excellent cycling and rate performance, holding great potential as a high-rate and stable anode material for lithium storage.

Superior cycle performance and high reversible capacity of SnO2/graphene composite as an anode material for lithium-ion batteries

“…After 400 cycles, the nanoparticles no longer show clear boundaries because of repeated lithium alloying and dealloying (figure 9 (c)). But the capacity of SnO 2 /graphene composite in the 400 th cycle shows no fade, which is similar with reported in literatures525354. All these phenomena reveal that the interaction between SnO 2 nanoparticles and graphene sheets is very strong before 400 cycles of discharge/charge test at 1000 mA g −1 , and reversible reaction of SnO 2 in the SnO 2 /graphene composite is more and more thoroughly due to the size of nanoparticles become smaller and smaller.…”

Sandwich-like mesoporous graphene@magnetite@carbon nanosheets for high-rate lithium ion batteries

“…This phenomenon can be attributed to insufficient amount of graphene and relatively low diffraction intensity of graphene according to literature [25,37]. The Raman spectra of the GS@Fe 3 O 4 @C sample confirm the presence of carbon and graphene in the products [5]. As shown in Fig.…”

Mesoporous Hybrids of Reduced Graphene Oxide and Vanadium Pentoxide for Enhanced Performance in Lithium-Ion Batteries and Electrochemical Capacitors

“…Significantly enhanced rate capability and long-term stability of EES devices have been observed by incorporating rGO with V2O5 12, 33-35 and other oxides 38 .…”