Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (18): 1850-1854. Previous Articles     Next Articles

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  1. (1中南大学化学化工学院 长沙 410083)
    (2武汉大学化学与分子科学学院 武汉 430072)
  • 收稿日期:2009-08-25 修回日期:2010-03-08 出版日期:2010-09-28 发布日期:2010-05-27
  • 通讯作者: 李亚娟
  • 基金资助:

    中国博士后基金(No. 20080440989);中南大学博士后基金

All Solid State Lithium Sulfur Rechargeable Battery with PEO-based Polymer Electrolytes

Li Yajuan*,1 Zhan Hui*,2 Huang Kelong1 Zhou Yunhong2   

  1. (1 Institute of Chemistry and Chemical Engineering, Central South University, Changsha 410083)
    (2 College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072)
  • Received:2009-08-25 Revised:2010-03-08 Online:2010-09-28 Published:2010-05-27

The electrochemical performances of S8 and polyanthra [1 ,9 ,8 -b,c,d,e][4 ,10 ,5 -b ,c ,d , e ]bis-[1,6,6a(6a-SIV)trithia]pentalene (PABTH) in PEO-based polymer electrolyte are studied. It s found that there are phenomena of the solution of reduction products in the discharging process for Li/PEO-based polymer electrolyte/S8 cell and Li/PEO-based polymer electrolyte/PABTH cell. It suggests that ether-based electrolytes even in the form of polymer (such as PEO-based Polymer Electrolytes) can t alleviate the loss of active material in sulfur electrode for the dissolution of its reduction products. For alleviating the solution of reduction production, designing electrolyte solvent with a special structure is necessary. Moreover, preliminary investigation on discharge capacity of the Li/PEO-based polymer electrolyte/S8 cell and PABTH/ PEO20LiTFSI/Li cell show that the utilization of the active material is lower than that in liquid electrolyte. It due to that sulfur and PABTH isn t ionic conductor, and the diffusivity values of Li in sulfur and PABTH are very low. PEO molecular with a large volume can t penetrate into particle of sulfur and PABTH carrying Li, this is another main reason. From this point of view, electrolyte solvent with a small volume is favorable to the utilization of sulfur and PABTH.

Key words: rechargeable lithium sulfur battery, capacity fade, polymer electrolyte, PEO-based, molecular design of electrolyte solvent