Study On The Preparation And Properties Of SnSb Alloy For The Anode Of Lithium-Ion Battery

Now , Lithium-ion batteries make LiCoO2 and C to do cathode and anode.Compared with the commercialized graphite materials with a theoretical capacity of 372mAh/g, metals like Sn and A1 have a higher lithium storing capacity. However, their tremendously increased volume when alloyed with lithium leads to a deteriorating recycling performance, which becomes the focus of most researches on the negative materials of the rechargeable lithium-ion batteries. The materials of Sn-based alloys are the earliest and most extensively studied materials for the lithium-ion battery all through the world.This paper firstly made a generalization on the development of the negative electrode materials of the lithium ion batteries and then studied the preparation and improving techniques of SnSb in detail. We studied the different parameters'influences on the structure and the performances of SnSb produced by chemical coreduction method, including the synthesizing temperature, desiccating time, the PH value of the reducing agents, and the reactant contents and made some improvements on the preparation methods. Furthermore, we analyzed the crystal structure of the SnSb material thus achieved by XRD, observed its surface condition by SEM, studied its capacity and recycling performance by charge-discharge test and the mechanism of its electrochemical reactions by CV and EIS methods.Our researches indicated that the materials of SnSb prepared by the chemical coreduction method have relatively satisfactory microstructure and electrochemical performances and its discharging capacity was 330mAh·g-1 at 0.1C during the tenth cycle. The results of the EIS examination indicated that the electrochemical reaction of the SnSb alloy electrode was a typical process jointly managed by both electrochemical reaction and diffusion. Moreover, the impedance values decreased, the reactions became more easily, and the charge and discharge performance became better as the discharging potential decreased and the reactions also became easily as the cycling times increased. Meanwhile, a film inclined to form on the surface because inset lithium was not stable in the electrolyte. The XRD tests and charge and discharge examination also revealed...