▎ 摘　　要

NOVELTY - Preparing three-dimensional layered tin oxide quantum dot/graphene framework composite material comprises (a) taking tin(II) chloride dihydrate and thiourea, dissolving in water to mix to obtain yellow transparent three dimensional layered tin oxide quantum dot colloid solution, (b) taking the quantum dot colloid solution obtained in the step (a) and graphene aqueous solution for mixing, performing hydrothermal reaction to obtain three-dimensional layered tin oxide quantum dot/graphene framework composite material precursor, (c) the step (b) to obtain the composite material precursor for postprocessing to obtain the three-dimensional layered tin oxide quantum dot/graphene framework composite material. USE - The three-dimensional layered tin oxide quantum dot/graphene framework composite material is useful for lithium ion battery (claimed). ADVANTAGE - The The three-dimensional layered tin oxide quantum dot/graphene framework composite material has very high reversible capacity; good cycle stability and environmentally friendly. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for (1) three-dimensional layered tin oxide quantum dot/graphene framework composite material prepared by above method, the thickness of the composite material is 3-6 mu m and particle size of the tin oxide quantum dots is 3-5 nm; and (2) three-dimensional layered tin oxide quantum dot/graphene framework composite material comprising directly pressing material into a cathode and assembling with a lithium plate to form a lithium ion battery.