Composition Optimization and Characteristics of PEO-LiCF3SO3-Tetraglyme and PEO-LiCF3SO3-Tetraglycol Polymer Electrolytes

PEO-LiCF3SO3-Tetraglyme與PEO-LiCF3SO3-Tetraglycol高分子電解質之組成最佳化與性質

杜景順(Jing-Shan Do) ； 蕭偉利(Wei-Li Hsiao) ； 蔡明瞭(Ming-Liao Tsai)

《Journal of the Chinese Institute of Chemical Engineers》 33卷4期 (2002/07) Pp. 341-351

https://doi.org/10.6967/JCICE.200207.0341

摘要

利用混合物實驗設計法獲得高分子電解質(SPEs)之離子導電度對數值與其組成間之關係模式近似值，高分子電解質之離子導電度明顯的受到其中可塑劑(tetraglyme與tetraglycol)含量的影響。在30℃當可塑劑含量由0增加至0.6時，高分子電解質(PEO-LiCF3SO3-可塑劑)之離子導電度由階次10-9增加至10-4S·cm-1，同時，當可塑劑的含量增加時，PEO-LiCF3SO3-可塑劑的玻璃轉移溫度、熔點與結晶性下降，但離子導電度增加。當PEO-LiCF3SO3-Tetraglyme與PEO-LiCF3SO3-Tetraglycol 高分子電解質的組成分別為[0.22, 0.19, 0.59] 與[0.20, 0.17, 0.63]時，以不繡鋼為工作電極當電位小於4.0 V(vs. Li/Li+)，其氧化電流相當小；但當電位分別大於5.1與5.0V時，其氧化電流明顯的增加。

並列摘要

Approximate models of the logarithmic ionic conductivity versus the composition of polymer electrolytes were obtained in terms of the mixture design method. The ionic conductivity of SPEs was strongly affected by the contents of plasticizers (tetraglyme and tetraglycol). The order of ionic conductivity increased from 10-9 to 10-4 S‧cm-1 at 30℃ upon increasing the weight fraction of plasticizers in the PEO-LiCF3SO3-plasticizer from 0 to 0.6. Increasing the weight fraction of the plasticizer in polymer electrolytes caused the glass transition temperature, the melting point, and the crystallinity of PEO-LiCF3SO3-plasticizer to decrease, whereas the ionic conductivity increased. When stainless steel was used as the working electrode, the anodic current was relatively less for potential below 4.0 V(vs. Li/Li+), and the anodic current increased significantly for potential greater than 5.1 and 5.0 V when the compositions of the PEO-LiCF3SO3-Tetraglyme and PEO-LiCF3SO3-Tetraglycol polymer electrolytes were [0.22, 0.19, 0.59] and [0.20, 0.17, 0.63], respectively.

並列關鍵字

PEO ； Tetraglyme ； Tetraglycol ； Ionic conductivity ； Mixture design