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Abstract: In this work, a new nanostructure of SnO2 nanoparticles (NPs) encapsulated into hollow TiO2 nanowires (SnO2@TiO2) has been successfully fabricated. This unique architecture intrinsically possess void space in between the TiO2 shell and SnO2 nanoparticle cores, as confirmed by XRD, XPS, SEM, TEM and HRTEM characterizations. The TiO2 shell of the composite can not only alleviate the pulverization and drastic volume change of the SnO2 NPs and maintain the structural integrity, but also contribute to the total capacity of the composite. Moreover, the void space can also accommodate the volume expansion of SnO2 and provide highly efficient channels for the fast transport of both electrons and lithium ion during discharge/charge cycling process. When tested as potential anode materials for lithium ion batteries, the as-prepared hollow TiO2 nanowires shell encapsulating SnO2 NPs architecture exhibits good lithium storage performance and excellent cyclability (which delivers a higher reversible capacity of 445 mAh g−1 at 800 mA g−1 after 500 cycles). The unique architecture should be responsible for the superior electrochemical performance. [Copyright &y& Elsevier]

Abstract: In this work, a new morphological nanostructure of the CNWs@ultrathin SnO2 NSs@C composite has been successfully fabricated, realizing the integration of two-dimensional ultrathin SnO2 NSs and one-dimensional CNWs. The nanosized ultrathin SnO2 NSs (thickness of ca. 1–3 nm) are uniformly distributed between one dimension CNWs core and C shell, as confirmed by XRD, SEM, TEM and HRTEM characterizations. When tested as potential anode materials for LIBs, the as-prepared coaxial nanocable-like CNWs@ultrathin SnO2 NSs@C composite exhibits outstanding reversible capacity for lithium storage (695 mAh g−1 after 40 cycles at 160 mA g−1, 651 and 618 mAh g−1 after 80 cycles at 400 and 800 mA g−1, respectively). This intriguing architecture, which integrates both electronic conductivity and buffering matrix design strategies, contributing to enhanced lithium storage performance. [Copyright &y& Elsevier]