▎ 摘　　要

A chemical reduction route was designed to prepare flexible and free standing 3D-rGO porous sponges embedded Sn nanospheres (3D-rGO/Sn). It is revealed the relation between phase composition and contact and charge -transfer resistances. The structural and interfacial stabilization of 3D-rGO/Sn through Sn-C chemical bonds can effectively preserve the isolated Sn nanospheres from detaching, and enhance the charge transfer. Simul-taneously, Sn nanosphere wrapped by thin graphene layers could alleviate the large stress generated from the volume expansion of Sn. Finally, for lithium-ion batteries, the optimal 3D-rGO/Sn anode exhibited an excellent cycling stability performance and rate performance compared to Sn nanospheres and the mixture of 3D-rGO and Sn.