Synthesis and performance of VS4@rGO anodes in lithium-ion batteries
Vanadium tetrasulfide(VS4)is being increasingly recognized as a promising anode material for lithium-ion batteries(LIBs)due to its unique one-dimensional(1D)chain structure,which composed of vanadium and sulfur(V-S)with a high sulfur content.The sandwich structure of the compound,characterized by the coordination of S2 dimers to two adjacent V atoms,and weak Van der Waals interactions between single chains allows for rapid diffusion of Li+.To further enhance its electrochemical performance,a composite of vanadium tetrasulfide with reduced graphene oxide(rGO)as the anode material was synthesized using hydrothermal method.As a result,VS4 nanorods was tightly immobilized on graphene oxide sheets,and the electrical conductivity was effectively improved,and the agglomeration of VS4 nanorods into spheres was avoided.VS4@rGO batteries exhibit excellent electrochemical performance under various current densities,with average discharge specific capacities of 983,797,666,547 and 397 mAh·g-1 recorded at 0.2,0.5,1.0,2.0 and 5.0 A·g-1.The capacity of the VS4@rGO batteries remains at 141.6 mAh·g-1 after 3000 cycles at a current density of 5 A·g-1,and the average capacity decay rate is only 0.0017％per cycle.This study provides novel insights into the structural design of transition metal sulfides and their potential application in high-performance LIBs.
lithium-ion batteriesanode materialsvanadium tetrasulfidegraphenetransition metal sulfide
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