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One-pot hydrothermal fabrication and enhanced lithium storage capability of SnO2 nanorods intertangled with carbon nanotubes and graphene nanosheets
- Xie, Qinxing, Zhu, Yating, Zhao, Peng, Zhang, Yufeng, Wu, Shihua
- Journal of materials science 2018 v.53 no.12 pp. 9206-9216
- anodes, carbon nanotubes, energy, graphene, hot water treatment, lithium, lithium batteries, nanorods, nanosheets, synergism, tin dioxide
- A three-dimensional (3D) nanoarchitectured ternary composite of SnO₂ nanorods intertangled with multiwalled carbon nanotubes and graphene nanosheets (SnO₂/CNTs/Gr) was synthesized via one-pot template-free hydrothermal method and investigated as anode for lithium-ion batteries. Compared to bare SnO₂ and corresponding binary composites including SnO₂/CNTs and SnO₂/Gr, SnO₂/CNTs/Gr shows significantly improved cycling stability and rate performance. The initial discharge specific capacity of SnO₂/CNTs/Gr is 1391 mAh g⁻¹ and remains 522 mAh g⁻¹ after 50 cycles at a current density of 100 mA g⁻¹. Meanwhile, the composite shows excellent rate reversibility. For example, 120 mAh g⁻¹ can be retained at a high current density of up to 1600 mA g⁻¹, and 582 mAh g⁻¹ can still be retrieved once the current density is switched back to 50 mA g⁻¹. The carbon nanotubes and graphene nanosheets in the composites play different enhancing effect. The significantly improved energy storage capability of SnO₂/CNTs/Gr can be attributed to a synergistic effect of the intertangled CNTs and graphene nanosheets.