Li-BCX电池阴极反应行为的循环伏安法研究

用循环伏安法研究了玻碳电极上Cl₂,Br₂,BrCl对1M LiAlCl₄/SOCl₂电解液的阴极还原过程的影响.结果显示,该电解液在玻碳电极上的阴极还原过程出现一个不可逆的SOCl₂还原峰,峰电位~2.6 V(相对于Li/Li⁺参比电极,下同).电极经4.9 V极化5 m in预处理,出现氧化产物SOCl₂(~3.6 V)和Cl₂(~3.3 V)的还原峰.电解液中加入Cl₂后,Cl₂还原峰增大,加入Br₂则在~3.1 V出现Br₂还原峰,同时~2.6 V对应的SOCl₂还原峰电流下降;电解液中加入BrCl后同时存在着Cl₂和Br₂的还原峰,随BrCl浓度的增加,Cl₂还原峰增大,而Br₂还原峰减小,SOCl₂还原峰逐渐消失.;The influence of Cl₂, Br₂ and BrCl on the cathodic reduction process of 1M LiAlCl₄/SOCl₂ solution is studied in cyclic voltammetry method.The results show that an irreversible reduction peak of SOCl₂ at about 2.6V(vs Li/Li⁺, the same as below) appears during cathodic process of 1M LiAlCl₄/SOCl₂ solution on glassy carbon electrode.After being pretreated at 4.9 V for 5 minutes, the reduction peaks of SCl₂(~3.6 V)and Cl₂(~3.3 V)as oxidation products are found.The addition of Cl₂ to the solution enhances the reduction peaks at~3.3 V;and the addition of Br₂ causes the Br₂ reduction peaks at~3.1 V to appear;the reduction peak currents of SOCl₂ drop in both cases.The addition of BrCl to 1M LiAlCl₄/SOCl₂ solution makes the existence of both Cl₂ and Br₂ reduction peaks.With the increase in the BrCl concentration, the Cl₂ reduction peaks are raised but the peaks of Br₂ decline, and the peaks of SOCl₂ gradually disappear