SnS/SnS2/rGO heterostructure with fast kinetics enables compact sodium ion storage

Constructing high-energy-density and low-cost batteries is the ultimate pursuit of energy market. However, fast kinetics becomes a critical bottleneck, when the volume and weight parameters to be constantly optimized. Herein, sheet-like SnS/SnS2/rGO heterostructure is designed rationally for kinetics challenges of compact energy storage under high mass loading. Abundant heterogeneous grain boundaries and ideal buffer space are provided by in-situ growth of hetemstmctures, achieving fast conductivity and structural stability. As anode for sodium ion battery, mass loading of similar to 3 mg cm(-2) SnS/SnS2/rGO exhibit rapid rate capability (460.9 mAh g(-1)- at 2.0 A g(-1)) and excellent cycling stability (81% capacity retention for 500 cycles at 1.0 A g(-1)). The assembled full cell demonstrates a promising energy density of 130.3 Wh kg(-1). Importantly, first-principles calculations unravel that interior electric-field induced by heterojunction of phase interfaces can accelerate the charge transfer. Additionally, the anode can also demonstrate good electrochemical performance in potassium-ion batteries. This work provides a new perspective to realize rational structural engineering for high-energy-density devices.

Automated summary

The sheet-like heterostructure of SnS/SnS2/rGO is rationally designed to address fast kinetics challenges in compact energy storage under high mass loading. This structure provides abundant heterogeneous grain boundaries and buffer space, achieving fast conductivity and structural stability, showing excellent electrochemical performance.