【摘要】 通过测定循环伏安曲线研究了石墨-SbCl₅在1M LiClO₄-PC（碳酸丙二醇酯）溶液中的电化学行为,Ⅰ、Ⅱ级石墨-SbCl₅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-SbCl₅的方波恒电流充放电表明,在500μA/cm²下,Li的插入量x(x=Li/C₃₆SbCl₅)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-SbCl₅放电时的阴极反应是锂插入和形成新的层间化合物LiC₂₄SbCl₅的两个过程。更多还原

【Abstract】 The electrochemical behaviour and the structure of graphite—SbCl₅ intercalation compound （SbGl₅-GIC） in Li/C_xSbCl₅ batteries （in 1 M LiClO₄-PG electrolyte） have been investigated. The reduction peak current of the stages 1 and 2 （SbGl₅-GIC） has the value of 2.75～2.35V and oxidation peak current 2.85～3.05 V （vs. Li/Li⁺）. When the quantity of Li intercalated in the stage 3 (C₃₆SbCl₅) was lower 0.3 (X_L1=0.3)（50μA/cm²） the reversibility of Li in the cathode (C₃₆SbCl₅) was pretty good. The electron diffraction patterns and X-ray diffraction spectra showed that Li was intercalated in the stage 2 SbCl₅-GIG and formed a new LiC₂₄SbCl₅ phase in the discharge process. Li grew up epitaxially on the γ-SbCl₅ phase in the spaces of the carbon atom layer planes in the form of a two dimentional crystal cell and α=17.22 . The intercalation reaction in the stage 2 SbCl₅-GIC may take place according to the following equations:xLi⁺+xe^-+C₂₄SbCl₅→Li_xC₂₄SbCl₅Li_xC₂₄SbGl₅→xLiC₂₄SbCl₅+（1-x）C₂₄SbCl₅更多还原