Hydrothermal Synthesis and Electrochemical Performance of Amorphous SiO<sub>2</sub> Nanospheres/Graphene Composites
- 1 School of Materials Science and Engineering, Hefei University of Technology, Hefei, China
- 2 School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, China
- 3 School of Materials Science and Engineering, Hefei University of Technology, Hefei, China
- 4 School of Materials Science and Engineering, Hefei University of Technology, Hefei, China
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 SiO 2 nanocomposites is a research hot topic of anode materials in lithium-ion batteries. In this paper, the amorphous SiO 2 nanospheres/graphene composite was synthesized by hydrothermal method. Amorphous SiO 2 is attached to the surface of graphene with a spherical structure and its average diameter is about 200 nm. The weight of SiO 2 in the nanospheres composite is about 43%. Electrochemical tests showed that the amorphous SiO 2 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 50 th cycles at a current density of 200 mAg -1 . The amorphous SiO 2 nanospheres/graphene composite structure is novelty and the results are of great significance to the preparation and application of new anode materials.
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