▎ 摘　　要

Double shell micro-cube assembled by nanosized Co3Sn2/SnO2 heterostructures with amorphous carbon layers wrapped in three-dimensional graphene matrix was fabricated via a series of combined procedures, which exhibits the superior lithium and sodium storage performance. [GRAPHICS] A double shell micro-cube assembled by nanosized Co3Sn2/SnO2 heterostructures with amorphous carbon layers wrapped in three-dimensional graphene matrix (DS-Co3Sn2/SnO2@C@GN) is successfully synthesized via a series of combined procedures containing co-precipitation, hydrothermal reaction for carbon coating, stirring for mixing and calcination. Compared to the single shell (SS-) and yolk-shell (YS-) structure, this unique hierarchical architecture has several obvious advantages to ameliorate the battery performances, including (1) huge inner voids and plenty of mesopores, (2) the synergetic effect of amorphous carbon and graphene, (3) the internal potential created by the formation of Co3Sn2/SnO2 heterojunction and (4) enhanced structural stability of this micro-cube by chemical bond. When used as the anode electrode of lithium ion batteries (LIBs), it exhibits the superior performance with a reversible charge storage capacity of 744 mA g(-1) after 100 cycles and 605 mA g(-1) after 300 cycles at a current density of 0.1 A g(-1). Meanwhile, the DS-Co3Sn2/SnO2@C@GN micro-cube also shows good sodium storage capacity.