▎ 摘　　要

NOVELTY - A carbon/tin/graphene composite nano fiber preparing method involves dissolving polyacrylonitrile in DMF. The solution is placed into the stirrer. The solution is stirred. The stannous chloride and graphene are added into the solution. The solution is ultrasonically shaken until homogeneous, followed by spinning the solution in an electrospinning device to obtain polyacrylonitrile/tin chloride/graphene composite nano fiber membrane. The composite nano fiber film is placed in a tube furnace. The composite nano fiber film is heated and cooled to room temperature to obtain final product. USE - Method for preparing a carbon/tin/graphene composite nano fiber that is utilized in lithium ion battery (claimed) and portable device. ADVANTAGE - The method enables preparing the carbon/tin/graphene composite nano fiber with excellent electrochemical properties, better cycle performance and good rate characteristics, in simple and cost effective manner. DETAILED DESCRIPTION - A carbon/tin/graphene composite nano fiber preparing method involves dissolving polyacrylonitrile in DMF to obtain solution in a mass percentage of 8-15 %. The solution is placed into the stirrer to adjust the appropriate speed. The solution is stirred to room temperature for 12-24 hours. The stannous chloride and graphene are added into the solution, placed same stirring to adjust the appropriate speed for 8-10 hours to form a homogeneous solution. The solution is ultrasonically shaken for 1-3 hours until homogeneous, followed by spinning the solution in an electrospinning device to obtain polyacrylonitrile/tin chloride/graphene composite nano fiber membrane with spinning voltage of 10-20kV, receiving distance is 10-20 cm and spinning speed is 0.2-2 mL/hour. The composite nano fiber film is placed in a tube furnace and heated from room temperature to 200-300 degrees C at temperature rising rate of 1-10 degrees C/minute in an air atmosphere and kept at temperature for 2-5 hours. The composite nano fiber film is heated to 600-1000 degrees C under nitrogen or argon atmosphere with heating rate of 1-10 degrees C/minute, and kept the temperature for 2-5 hours and cooled to room temperature to obtain final product.