Stable anchoring and uniform distribution of SiO2 nanotubes on reduced graphene oxide through electrostatic self-assembly for ultra-high lithium storage performance

• Key Words:HOLLOW SILICA SPHERES; ANODE MATERIAL; ENERGY-STORAGE; NANOPARTICLES; BATTERY; NANOSHEETS; NANOCOMPOSITE; NANOSPHERES; COMPOSITES; MOS2
• Abstract:As one of the most abundant materials on earth, SiO2 has a broad prospect in the application of lithium ion batteries due to its high specific capacity, low cost and environmental friendliness. However, the low electrical conductivity and large volume variation during charging and discharging lead to the serious performance degradation of SiO2. In this paper, we synthesized a 1/2D hierarchical material, in which SiO2 nanotubes were uniformly anchored on the surface of reduced graphene oxide through electrostatic self-assembly, and it delivers a high discharge capacity of 961 mAh g(-1) at the current density of 200 mA g(-1) after 250 cycles. At a high current density of 5000 mA g(-1), it still shows a decent discharge capacity of 378 mAh g(-1) after 2000 cycles, drawing parallels to that of commercial graphite. The excellent performance is mainly attributed to the nanotube structure of SiO2 and its uniform distribution on rGO by electrostatic self-assembly. (C) 2020 Elsevier Ltd. All rights reserved
• Volume:167
• Issue:NO
• Translation or Not:no