Ultra-Thin Sns2 Nanosheets Grown on Carbon Nanofibers with High-Performance in Sodium-Ion Energy Storage

Abstract

SnS2 with two-dimensional layered structure has great application promising in the energy storage system due to its super high theoretical capacity. However, the serious volume expansion and low intrinsic conductivity are difficult to meet the commercial application of SnS2 in sodium-ion batteries (SIBs). Herein, SnS2/CNF was successfully prepared by simple electrospinning techniques and hydrothermal methods. Based on the synergistic effect between ultra-thin nanosheets and carbon nanofibers, SnS2/CNF as anode material not only shortened the path of electron transport, but also accelerated the sodium ion reaction kinetics, thus showed outstanding stability and reversibility SIBs. The SnS2/CNF displayed the excellent rate properties (352 mAh g-1 at 5 A g-1) as well as stable long term cycle performance (338 mAh g-1 at 3 A g-1 after 500 cycles). Furthermore, SnS2/CNF was assembled as sodium ion hybrid capacitor (SIHCs), which displayed excellent energy density and power density of 97 Wh kg-1 /54 W kg-1. The capacity retention is 81% after 2500 cycles at 1 A g-1. The SIHCs could light up to 100 LEDs easily, which thus exhibited great practical application potential in energy storage device.

Keywords: Sodium ion batteries, Electrospinning, SnS2/CNF, Ultra-thin Nanosheets, Sodium-ion hybrid capacitors