Abstract
The exceptional mechanical and electrical nature of grapheme makes it a viable candidate for enhancing the effectiveness of electrode material. In recent years, Graphene based SiO2 nanocomposites is a research hot topic of anode materials in lithium-ion batteries. In this paper, the amorphous SiO2 nanospheres/graphene composite was synthesized by hydrothermal method. Amorphous SiO2 is attached to the surface of graphene with a spherical structure and its average diameter is about 200 nm. The weight of SiO2 in the nanospheres composite is about 43%. Electrochemical tests showed that the amorphous SiO2 nanospheres/graphene composite exhibited the first charge and discharge capacity is respectively 329.5 mAhg-1 and 444.1 mAhg-1, and remain at 257.8 mAhg-1 and 274.6 mAhg-1 for 50th cycles at a current density of 200 mAg-1. The amorphous SiO2 nanospheres/graphene composite structure is novelty and the results are of great significance to the preparation and application of new anode materials.
Highlights
As one kind of acidic non-metallic oxide, Silicon dioxide (SiO2) is mainly in the form of crystalline and amorphous
The amorphous SiO2 nanospheres/graphene composite structure is novelty and the results are of great significance to the preparation and application of new anode materials
The semi-transparent graphene sheets with anchored SiO2 nanospheres are clearly visible in Figure 1(b), thereby confirming the attachment of SiO2 nanospheres to the surface of grapheme
Summary
As one kind of acidic non-metallic oxide, Silicon dioxide (SiO2) is mainly in the form of crystalline and amorphous. Previous studies have proposed that compared with crystalline silicon oxide, amorphous SiO2 is favored in industry with respect to cycling stability [1]. SiO2 nanoparticles were found to react with Li in the voltage range of 0 - 1 V and the n-Si/Li system has a lower and essentially constant electrochemical potential relative to Li/Li+, which is advantageous for use as anode materials in Li-based batteries [4]. In order to explore the application of SiO2 in electrode materials, graphene based SiO2 nanocomposites have recently been studied in detail for applications in lithium-ion batteries, e.g., SiO2 nanoparticles/graphene [5] [6], SiO2 nanospheres/graphene [7] [8] and ternary composites [9] [10]. The electrochemical performance of a-SiO2@G as anode for LIBs has been evaluated
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