▎ 摘　　要

NOVELTY - Tin oxide/tin/few-layer graphene composite material comprises nanocrystalline tin oxide, nanocrystalline tin and few-layer graphene, where nanocrystalline tin oxide and nanocrystalline tin are uniformly coated in few-layer graphene carbon substrate. USE - Tin oxide/tin/few-layer graphene composite material used for manufacturing sodium-ion battery cathode material (claimed). ADVANTAGE - The tin oxide/tin/few-layer graphene composite material provides sodium-ion battery cathode material, which has high capacity and excellent cycle performance at 100 mA/g charge and discharge current density, first specific capacity of 448 mA-hours/g, and capacity retention of 370 mA-hours/g after 250 cycles. It has simple preparation, low cost and high yield, is easy for large-scale production, and provides environmental pollution. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of tin oxide/tin/few-layer graphene composite material comprising adding tin powder and expanded graphite in a ball mill, mixing, vacuum pumping, filling gas medium and ball milling to obtain tin oxide/tin/few-layer graphene composite material.