▎ 摘　　要

NOVELTY - A three- dimensional graphene layer filling carbon coated tin granule composite material comprises upper and lower three-dimensional graphene layers and carbon-coated tin in between the upper and lower three-dimensional graphene layers, where the thickness of three-dimensional graphene layer is 1-10 nm, the radius of the three-dimensional graphene network is 1-10 nm, the carbon-coated tin comprises particle size of 5-30nm, thickness is 1-4nm, and tin and carbon mass ratio of (0.4-0.7):(0.6-0.3). USE - Three- dimensional graphene layer filling carbon coated tin granule composite material. ADVANTAGE - The material is harmless and simple to prepare, and has high reversible capacity, strong stability and better circulation performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a carbon coated tin granule composite material, which involves mixing tin source and carbon source at mol ratio of (50-10): 1, mixing the tin source and sodium calcium chloride at mass ratio of (0.01-0.1): 1, adding sodium calcium chloride with deionized water and stirring to prepare solution, placing the solution in refrigerator and freezing the solution, placing the solution in a drying machine, heating to 50 degrees c to obtain mixture, grinding the mixture into powder, carrying out sintering process by using tubular furnace constant temperature area, providing gas source at 200-400 ml/min gas flow rate for 10-30 minutes, heating to 300-450 degrees C for heating speed of 1-10 degrees C /min, cooling to room temperature to obtain first sintering product, grinding first sintering product, heating to 60-120 degrees C, mixing the sodium calcium chloride with the first sintering product at mass ratio of (5-10):1, adding anhydrous glucose with the deionized water to obtain dispersant solution, transmitting the dispersant solution to a hydrothermal reaction kettle, drying to 180 degrees C, washing present neutral solution to obtain second sintering product, grinding second sintering product, adding carrier gas and hydrogen gas at 50-200 ml/min gas flow rate for 5-10 minutes, heating to 750 degrees C to carry out catalyze reaction for obtaining third sintering product, washing the third sintering product in the deionized water for 80 degrees C to obtain three- dimensional graphene layer filling carbon coated tin particle composite material.