| Due to the increasingly prominent environmental problems,the demand for sustainable energy storage devices is increasing.In recent years,lithium-ion batteries have been widely used in the market,but due to the contamination of organic electrolyte,safety and strict assembly environment,it is necessary to develop new storage devices to replace them.Among them,zinc ion battery has been favored by researchers because of its high theoretical specific capacity,low redox potential,non-contamination and easy processing.However,its current problems prevent it from being commercialized,such as zinc anode dendrite,poor electrical conductivity of anode material.In this paper,VS2/MXene nanosheets were prepared by hydrothermal method with vanadium sulfide and titanium carbide as raw materials.In order to overcome the electrochemical corrosion and internal dendrite growth,electrolyte additives and zinc anodes were added to solve these problems.The main contents are as follows:1.Zn//VS2/MXene batteries were firstly fabricated by the preparation of laminated vanadium sulfide/titanium carbide（VS2/MXene）composites by hydrothermal method.XRD and XPS analysis proved that the composite of VS2 and MXene was successful.The morphology test showed that the composite material had a flake structure,which provided more active sites and promoted the transmission of zinc ions,thus improving the reaction kinetics of the material.The maximum capacity of VS2/MXene is 185.5 m Ah g-1 at A low current density of 0.1 A g-1,and the cycling stability of VS2/MXene composites is better at A high current density of 1.0 A g-1.2.In order to overcome the problem of zinc dendrite growth of zinc ion battery,conductive polyaniline was prepared by chemical polymerization method and sulfonated aniline electrolyte additive was obtained.With 1M Zn SO4+SPANI as electrolyte,the influence of electrolyte additive and the amount of additive on the electrochemical performance of VS2/MXene material was explored.The electrochemical behavior of Zn//VS2/MXene cells in 1M Zn SO4+0.04%SPANI electrolyte showed excellent electrochemical performance,with 432m Ah g-1 capacity contribution at 1.0 A g-1.At high current density(10 A g-1),the capacity retention rate is 96.2%after 1000 cycles of dendrite-free stability.3.In order to prevent the growth of zinc dendrites,the corrosion of zinc sheets and the occurrence of side reactions,zinc sheets were treated with metal fluoride/dimethyl sulphoxide solution（SnF2/DMSO）and（W2S/DMSO）to construct a solid bipolar surface layer in situ,which was used as the anode material of zinc ion battery.The results of XRD and XPS structure showed that the dual-phase surface layer was successfully prepared.The electrochemical behavior showed that the SnF2-Zn anode had A high capacity contribution of 598 m Ah g-1 at 1.0A g-1,and its capacitance retention was 93%after 1000 cycles at 10 A g-1.4.The precursor of carbon nanoelectrode material was prepared by hydrothermal method,and the porous nitrogen-doped carbon nanoelectrode material was obtained by annealing.The results show that the nitrogen-doped nano-carbon material has a two-dimensional lamellar structure and a folded surface.Electrochemical behavior studies showed that the carbon nanocomposites showed outstanding cycling performance,with A capacitance retention rate of93%for 1000 cycles at 1.0 A g-1 and A capacity contribution of up to 164 m Ah g-1 at A low current density(0.1 A g-1). |
