Design And Synthesis Of Two-Dimensional Layered Metal Disulfides MS₂?M=Mo?Sn? Towards Electrochemical Performance As Anodes In Lithium Ion Batteries

At present,there is an increasing demand for high capacity lithium ion battery.Thus,it is critical to develop novel anode materials with high capacity,high charge-discharge efficiency and high cycle stability.Recent years,some metal sulfides MS2?M = Mo,W,Sn,etc.?with layered structure have attracted extensive research interest for the lithiation/delithiation platform.As one of the lithium-ion battery anode materials,the biggest advantage of layer metal sulfide is that it can provide good diffusion channel for lithium ions,and effectively alleviate volumetric expansion during the charge and discharge progress,which exhibits superb cycle behavior and improved rate performance.Here,we mainly study liquid synthesis of the layered metal sulfide MS2?M = Mo,Sn?and its electrochemical performance.Main results of researches are as shown below.?1?Hollow fullerene-like MoS₂?IF-MoS₂?nanocages with a diameter about 100 nm were synthesized by a novel and simple phase reduction method.IF-MoS₂ exhibits excellent reversible capacity as high as 1008 mAh/g,good cycle performance after 100 cycles and remained good cycling stability,when the current density is 1000 mA/g.?2?A simple method was used to synthesize precursor with?NH4?2MoS4 and CTAB.After heating at 800 ? for 2 hours with the protection of nitrogen,the single-layer MoS₂/C composite was obtained.During the initial cycle,the reversible capacity of single-layer MoS₂/C could reach 1403.7 mAh g-1.After100 cycles,a high capacity was still remained.?3?A series of tin based material?Sn,SnO₂,SnS₂?with nitrogen doped graphene were prepared via hydrothermal process.Among of the three materials,SnS₂/NG exhibited the best electrochemical performance.After 100 cycles,the capacity retention rate SnS₂/NG electrode could reach 84.2%.