Directly Electrodeposition Of Al And Sn-based Nanowire As Anode Material For Li-ion Batteries

Metal-based anode materials are the most promising anode materials for next generation Li-ion batteries due to their higher specific capacity and better safety.In order to solve the volume expansion of metal-based anode material during charge-dischaege process,nanocrystallization and alloying are the most popular two ways.In this paper,AlFe and SnCo nanowires were prepared by directly electrodeposition in ionic liquid without using any templates.This study provides a simpler and cheaper method for the preparation of metal-based anode materials,and it has good theoretical and practical application value.In this paper,AlC3-FeCll3-TMHC ionic liquid was used to study the electrochemical reduction process and formation mechanism of Al3+ ions and Fe3+ ions.AlFe alloy nanowires were successfully prepared in AlCl₃-FeCl₃-TMHC ionic liquid by potentiostatic electrolysis.The effects of FeCl₃ to the morphology,composition and structure of the AlFe nanowires were studied.The results showed that the average diameter of AlFe nanowires was about 140 nm and its specific capacity was about 570 mAh/g after 50 charge-discharge cycles.SnCl₂-CoCl₂-EMIC ionic liquid was usd to directly electrodeposit SnCo nanowires anode material.The effects of ionic liquid composition and potential on the morphology and composition of the obtained products and the performance of SnCo anode were investigated.The results showed that SnCo nanowires showed an average diameter of about 50 nm.Its capacity as anode material could maintain at 600 mAh/g after 60 cycles.Our experiments proved that transition metal element Fe and Co doping could improve the cycling performance of metal Al and Sn as anode materials for lithium ion batteries to a certain extent.