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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.