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通过测定循环伏安曲线研究了石墨-SbCl_5在1M LiClO_4-PC(碳酸丙二醇酯)溶液中的电化学行为,Ⅰ、Ⅱ级石墨-SbCl_5的还原电流峰出现在2.75～2.35V,氧化电流峰在2.85～3.05V(相对于Lj/Li~+)。Ⅲ级和Ⅳ级的相应电位区间与上相同,但其峰值较小,且曲线较为平缓。Ⅲ级石墨-SbCl_5的方波恒电流充放电表明,在500μA/cm~2下,Li的插入量x(x=Li/C_(36)SbCl_5)在0.3以内,电极具有良好的可逆性。根据库仑滴定数据,放电前后X射线衍射图谱与电镜衍射花样的变化,初步认为Ⅰ、Ⅱ混合级石墨-SbCl_5放电时的阴极反应是锂插入和形成新的层间化合物LiC_(24)SbCl_5的两个过程。
The electrochemical behavior of graphite-SbCl_5 in 1M LiClO_4-PC (propylene carbonate) solution was studied by measuring the cyclic voltammograms. The reduction current peak of Ⅰ and Ⅱ grade graphite-SbCl_5 appeared at 2.75 ~ 2.35V and the oxidation current peak was at 2.85 ~ 3.05V (relative to Lj / Li ~ +). The corresponding potential ranges of Grade III and IV are the same as above, but the peak value is smaller and the curve is more gentle. The square wave constant current charge and discharge of Grade Ⅲ graphite-SbCl_5 shows that the insertion amount of Li (x = Li / C_ (36) SbCl_5) is within 0.3 at 500μA / cm ~ 2 and the electrode has good reversibility. According to the coulometric titration data, the change of X-ray diffraction pattern and the pattern of electron diffraction before and after discharge, it is preliminarily considered that the cathodic reaction of mixed graphite-SbCl_5 with I and II discharge is that lithium intercalation and formation of a new intercalation compound LiC_ (24) SbCl_5 A process.