Synthesis and lithium storage properties of interconnected fullerene-like carbon nanofibers encapsulated with tin nanoparticles
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Interconnected fullerene-like carbon nanofibers encapsulated with tin nanoparticles (Sn@FLCNFs) were synthesized by a facile and scalable electrospinning method using fullerene-like carbon nanoparticles and PVP as carbon sources. SEM and TEM revealed that Sn nanoparticles have been uniformly embedded into the nanofibers. The self-supported Sn@FLCNFs could be directly used as an anode of lithium-ion battery without adding any polymer and binder; it showed a high initial coulombic efficiency. A reversible capacity as high as 846 mA h g−1 remained after 100 cycles at a current density of 0.2 A g−1. When the current density was raised to 1 A g−1, the reversible capacity maintained 656 mA h g−1 after 300 cycles. The excellent electrochemical performance can be attributed to the formation of the efficient Li-ions diffusion paths and highly conductive cross-linked network in the Sn@FLCNFs electrode, and the interconnected carbon framework can prevent the Sn nanoparticles from pulverization and re-aggregation during cycles.
KeywordsReversible Capacity Solid Electrolyte Interphase Excellent Electrochemical Performance Solid Electrolyte Interphase Film Theoretical Specific Capacity
The project was financially supported by the Chunhui Program of Ministry of Education, China (Grant No. Z2014015), and the Natural Science Foundation of Qinghai Province, China (Grant No. 2016-ZJ-934Q).