Preparation,Characterization And Property Of Tin Phosphide/Carbon-based

Tin phosphide?Sn₄P₃?,which has high theoretical capacitance,was widely believed a good secondary battery cathode materials by researchers.However,there are some deficiencies,such as a large volume effect,poor electrical conductivity and so on.The low theoretical electrical capacity of the materials limited the development of anode materials.While carbon materials have good conductivity and small volume change,so they are generally used as anode materials in the market.Therefore,it is of great importance to recombine tin phosphide and carbon materials.In this paper,a series of phosphide tin/carbon-based composites were synthesized by hydrothermal solvothermal method.The morphology of the composites was controlled by conditional experiments.The electrochemical or catalytic properties of the composites were tested and the optimal synthesis conditions was found,and we probed the relevant performance of the reaction mechanism.The following is the research work of this topic:?1?The Sn₄P₃/rGO nanomaterials were successfully synthesized by the two-step method.The Sn₄P₃/rGO nanocomposites with a size of 30 nm deposit uniformly and firmly on the surface of graphene nanosheets.Sn₄P₃/rGO nanomaterials provided high gravimetric and volumetric capacities,and the rate performance of the as-obtained Sn₄P₃/rGO nanoparticles had been tested as an anode material for lithium ion batteries for the first time.At the current density of 500 mA g^-11 after 100 cycles the as-prepared Sn₄P₃/rGO nanocomposites electrode material had a high initial discharge capacity of 1503 mAh g^-1.Sn₄P₃/rGO nanomaterials show good electrochemical performance when employed as the anode for sodium ion batteries,giving an initial capacity of1007 mAh g^-11 at a current density of 1 A g^-11 and showing good electrochemical cyclability.?2?Thepreparedphosphide/carbonnanotubes?Sn₄P₃/MWCNTs?nanocomposites were synthesized by solvothermal method of treating multi-walled carbon nanotubes,stannous chloride and yellow phosphorus.The phase of the material was controlled by controlling the proportion of tin phosphide and multi-walled carbon nanotubes.The results said that when the ratio of the two materials was 3:1,the tin phosphide nanoparticles were uniformly loaded on the surface of the multi-walled carbon nanotubes.The electrochemical performance of the material was tested by a blue system.The test results showed that the material has a reversible capacity of about 1050mAh g^-11 after 100 cycles at a current density of 500 mA g^-1,showing that the material has good electrochemical performance.?3?In the DMF system,the core-shell Sn₄P₃@C composites were synthesized in situ by solvothermal method.Through the testing,it was found that the material was a core-shell structure with carbon as the shell and tin phosphide as the core.The morphology of the material was controlled by controlling the temperature and the amount of urea added.The experimental results show that when 1g urea was added to 160�C for 12h,Sn₄P₃@C will composite with a core-shell structure completely coated with carbon and having a uniform morphology and the positive dispersibility was obtained.The photocatalytic performance of the material was tested.The results show that the degree of degradation of methylene blue organic dye was 97%at 75 min,indicating that it has good photocatalytic properties.The electrochemical performance of the material was tested.The test results show that the reversible capacity reaches 1100 mAh g^-1(current density is 300 mA g^-1)after 100 cycles under optimal preparation conditions.