MoS2/N-doped graphene aerogles composite anode for high performance sodium/potassium ion batteries

Abstract

Three-dimensional porous MoS2/nitrogen-doped graphene aerogels (MoS2/NGA) with different MoS2 loading masses were synthesized by a simple hydrothermal method. The unique structure can provide more Na+ (K+) transport channels and the three-dimensional porous morphology could greatly absorb the volume expansion of MoS2 during charging and discharging process. As the anode of sodium-ion batteries (SIBs), this material provides a specific capacity of 673 mAh g−1 at a current density of 100 mA g−1 with long cycle stability. In addition, the composite shows a specific capacity of 305 mAh g−1 at 2000 mA g−1 and exhibits excellent capacity reversibility after rate performance test, indicating that it is a promising anode choice for SIB. As the anode material of potassium-ion batteries (KIBs), it provides a reversible specific capacity of 349 mAh g−1 at a current density of 100 mA g−1. It has a specific capacity of 72 mAhg−1 at 5000 mAg−1 and exhibits excellent capacity reversibility after rate performance test as well. Therefore, this work provides some insights into the fabrication of MoS2/graphene composites and is helpful for the design of high-performance anode materials of metal ion batteries.