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化学学报
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化学学报 ›› 1987, Vol. 45 ›› Issue (12): 1147-1151. 上一篇    下一篇

研究论文

锂在非层状硫化物中的电化学嵌入反应I:锂在硫化铅中的嵌入过程

李永舫;吴浩青   

  1. 复旦大学化学系
  • 发布日期:1987-12-15

Electrochemical intercalation reaction of lithium into sulfides of non-layer structure I:Lithium intercalation in lead sulfide

LI YONGFANG;WU HAOQING   

  • Published:1987-12-15

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通过库伦滴定、三角波电位扫描和X射线衍射物相分析,研究了Li/PbS电池的阴极反应机理.发现在该电池放电的第一个阶段(放电深度小于1.5),阴极上发生的是锂嵌入硫化铅晶格的反应,并且锂嵌入后硫化铅的主晶格结构基本未变,锂进入了晶体的立方体间隙中心位置.测得锂嵌入硫化铅生成LiPbS的嵌入自由能为-300.48kJ.mol^-^1(25℃),锂在LiyPbS(0

关键词: 反应机理, 扩散系数, 自由能, 插入反应, 锂同位素, 电化学反应, 硫化铅, 锂电池, 高能量电池

The reaction mechanism of cell Li/PbS was studied by coulombic titration, cyclic voltammetry and x-ray diffraction. In the 1st stage of discharge (0 < y ?1.5), the intercalation of Li into PbS took place. The x-ray diffraction patterns showed that the main crystalline structure of PbS remained unchanged after lithiation, and the Li intercalated probably locates in the center of the cubic-interspace of the crystal. The interaction free energy of Li into PbS forming LiPbS was found to be -300.48 kJ.mol-1 (25?. The chem. diffusion coefficient of Li in LiyPbS (0 < y ?1) was determine by an electrochem. method to be ~10-11 cm2.s-1.

Key words: REACTION MECHANISM, DIFFUSION COEFFICIENTS, FREE ENERGY, INSERTION REACTION, LITHIUM ISOTOPES, ELECTROCHEMICAL REACTION, LEAD SULFIDE, LITHIUM BATTERIES, HIGH ENERGY BATTERIES

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