Hollow bean-pod-like SiO2-supported-SnO2/C nanocomposites for durable lithium and sodium storage

Abstract

In order to better resolve the large volume expansion problem of SnO₂-based anode materials, a hollow bean-pod-like SiO₂-supported-SnO₂/C nanostructure with a sufficient internal void space is designed. Dual voids exist in this structure in combination with a SiO₂ support in the core and carbon as an outside shell, providing triple guarantees to improve the performance of SnO₂-based anode materials for Li and Na storage. As a result, after 550 charge/discharge cycles, a discharge capacity of 649 mA h g⁻¹ can still be obtained for Li storage, and a discharge capacity of 104 mA h g⁻¹ can still be maintained after 1000 charge/discharge cycles for Na storage.