Issue 51, 2016, Issue in Progress

Capacity-increasing robust porous SiO2/Si/graphene/C microspheres as an anode for Li-ion batteries

Abstract

Robust porous SiO2/Si/graphene/C microspheres have been successfully synthesized by a simple two-step process of ultrasonic spraying and partial magnesiothermic reduction. The 3-D porous microspheres consist of Si/SiO2 nanoparticles (around 5–10 nm) covered by a layer of carbon and connected by graphene. We explored the electrochemical properties of the porous microspheres as an anode for lithium ion batteries (LIBs). In SiO2/Si/graphene/C microspheres, numerous pores could leave enough room for volume expansion and contraction of silicon during lithiation and delithiation, and provide large space voids for electrolyte reserves. Meanwhile, graphene plays a role in reinforcing the porous structure. The prepared sample shows superior cyclability with a discharge capacity of 1104.9 mA h g−1 in the second cycle and 1141.6 mA h g−1 over 200 cycles at a current density of 0.1 mA cm−2. The capacity retention is more than 100%, making it very promising as a future LIBs anode.

Graphical abstract: Capacity-increasing robust porous SiO2/Si/graphene/C microspheres as an anode for Li-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
05 Mar 2016
Accepted
15 Apr 2016
First published
15 Apr 2016

RSC Adv., 2016,6, 45077-45084

Capacity-increasing robust porous SiO2/Si/graphene/C microspheres as an anode for Li-ion batteries

J. Wang, X. Chen, X. Liu, A. Hu, Q. Tang, Z. Liu, B. Fan, H. Chen and Y. Chen, RSC Adv., 2016, 6, 45077 DOI: 10.1039/C6RA05884A

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