一种新型的负极材料助力高倍率及长寿命的锂/钠储存OA北大核心CSTPCD

It is imperative to design suitable anode materials for both lithium-ion(LIBs)and sodium-ion batteries(SIBs)with a high-rate performance and ultralong cycling life.We fabricated a MoO2/MoS2 heterostructure that was then homogeneously distrib-uted in N,S-doped carbon nanofibers(MoO2/MoS2@NSC)by electrospinning and sulfurization.The one-dimensional carbon fiber skeleton serves as a conductive frame to decrease the diffusion pathway of Li+/Na+,while the N/S doping creates abundant active sites and significantly improves the ion diffusion kinetics.Moreover,the deposition of MoS2 nanosheets on the MoO2 bulk phase pro-duces an interface that enables fast Li+/Na+transport,which is crucial for achieving high efficiency energy storage.Consequently,as the anode for LIBs,MoO2/MoS2@NSC gives an excellent cycling stability of 640 mAh g-1 for 2 000 cycles under 5.0 A g-1 with an ultralow average capacity drop of 0.002％per cycle and an exceptional rate capability of 614 mAh g-1 at 10.0 A g-1.In SIBs,it also produces a significantly better electrochemical performance(reversible capacity of 242 mAh g-1 under 2.0 A g-1 for 2 000 cycles and 261 mAh g-1 under 5.0 A g-1).This work shows how introducing a novel interface in the anode can produce rapid Li+/Na+storage kinetics and a long cycling performance.