The Influence of SnCl₄ Doping on the Electrochemical Performance of Spinel Lithium Titanate (Li₄Ti₅O₁₂) Anode Material

摘要

A sol-gel method assisted high temperature solid state reaction has been successfully employed tosynthesize spinel Li4Ti5O12/SnCl4 composites. In this work, the effect of Ti:Sn atomic ratio wassystematically investigated. The structure of the Li4Ti5O12/SnCl4 material was investigated by X-raydiffraction (XRD), scanning electron microscope (SEM), and the electrochemical performance wasmainly studied by using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) andcharge-discharge tests. Results of electrochemical measurements demonstrated that when the atomicratio of Ti to Sn was 4.6:0.4, the best electrochemical performance was exhibited by the composite,-1 delivering an initial discharge capacity of 194 mAh g at 0.2 C and maintaining 81.1% of its initialcapacity after 20 cycles, which was remarkably superior to the pure Li4Ti5O12 that was prepared by thesame process in the absence of SnCl4.