Three-dimensional nanoarchitecture of Sn-Sb-Co alloy as an anode of lithium-ion batteries with excellent lithium storage performance

摘要

A novel nanoarchitectured Sn-Sb-Co alloy electrode is reported, which was prepared by direct electrodeposition on a Cu nanoribbon array in order to target the rapidly fading capacity and the poor rate-capability issues of Sn based materials for Li-ion batteries. The SEM images indicate a three-dimensional (3D) nanoarchitectured Sn-Sb-Co alloy with an array structure. Electrochemical measurements show that the 3D nanoarchitectured Sn_(54)Sb_(41)Co5 alloy electrode exhibits a reversible capacity as high as 512.8 mA h g~(-1) at 0.2 C (1 C = 650 mA g~(-1)) after 150 cycles. Furthermore, the 3D nanoarchitectured Sn_(54)Sb_(41)Co5 anode can deliver a high reversible capacity (275 mA h g~(-1)) up to the 80th cycle at a high discharge-charge rate of 23 C (~15 A g~(-1)). These outstanding electrochemical properties are attributed to the unique nanoarchitectures of the Sn_(54)Sb_(41)Co5 electrodes, making them an excellent anode material.