Electrospun layers by layers orderly stacked SnO2@aligned carbon nanofibers as high conductivity, long cycle life self-standing anode for reversible lithium ions batteries

Abstract

The structure and morphology of the electrode effects its performance. Designing superior self-standing anode structure is make sense for enhancing anode conductivity and prolonging cycle-life of the lithium-ion batteries (LIBs). Hence, electrospinning is developed to construct excellent integrated SnO2 nanoparticles composited orderly stacked aligned carbon nanofibers mats (SnO2@OSA-CNFs) as self-standing anode. The ordered stacked structure promises the SnO2 nanoparticles more uniformly dispersed and fixed in the carbon fibers mats, and its smooth surface ensures the Solid Electrolyte Interface (SEI) stability. Furthermore, the ordered structure facilitates the transmission of ions and electrons. Adequate space of orderly stacked aligned nanofibers released the concentration stress caused by expansion of particles after circulation. The SnO2@OSA-CNFs anode exhibited superior cycling stability until 600 cycles, with a capacity of 587 mA h g−1 at a current density of 100 mA g−1. Resistance of SnO2@OSA-CNFs charge transfer equals 8 Ω and the capacity of anode reaches 1068 mA h g−1 at 50 mA g−1 in first cycle. High speed rotation collector electrospinning technology can be widely extended to manufacture ordered carbon nanofibers composites for vital energy storage and batteries.