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电化学(中英文) ›› 2005, Vol. 11 ›› Issue (1): 62-66. 

• 研究论文 • 上一篇    下一篇

现场热引发聚丙烯酸酯类电解质的性能及应用

朴金丹,袁利霞,艾新平,杨汉西,曹余良   

  1. 武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院 湖北武汉430072 ,湖北武汉430072 ,湖北武汉430072 ,湖北武汉430072 ,湖北武汉430072
  • 收稿日期:2005-02-28 修回日期:2005-02-28 出版日期:2005-02-28 发布日期:2005-02-28

Electrochemical Performance of Gel Polymer Electrolyte Prepared by Thermal Initiating Polymerization of Acrylates

PIAO Jin-dan,YUAN Li-xia,AI Xin-ping~*,YANG Han-xi,CAO Yu-liang   

  1. (Dept.of Chem.,Wuhan Univ.,Wuhan 430072,China
  • Received:2005-02-28 Revised:2005-02-28 Published:2005-02-28 Online:2005-02-28

摘要: 应用热引发现场聚合方法制备聚丙烯酸酯类电解质,并考察其电化学性能.实验表明:该聚合物电解质具有 4. 5V的电化学稳定窗口,较高的室温电导率及良好的低温性能.当前驱体电解液中液态电解质含量为 85%时,其室温电导率为 3. 2×10-3S·cm-1, -30℃下的电导率达到 5. 6×10-4 S·cm-1.采用现场聚合技术制备的聚合物电池,其电化学性能与液态锂离子电池基本一致,首次充放电效率为 92. 1%, 1. 0C率放电容量为 0. 2C率的 95%, -20℃下的放电容量为室温容量的 72%,以 0. 5C率循环 300周后,仍保持初始容量的 85%以上.

关键词: 现场聚合, 聚合物电解质, 聚合物锂离子电池, 电导率

Abstract: A gel polymer electrolyte was prepared by thermal initiating polymerization of the acrylates in the EC/EMC/DMC electrolyte solution at 100℃. The LiCoO_2/MCMB polymer cells were assembled and their electrochemical properties were evaluated at various charge-discharge rate and temperatures. The ionic conductivity of the polymer electrolyte containing 85wt.% liquid electrolyte is around 3.2×10~(-3)S·cm~(-1) at 20℃ and 5.6×10~(-4)S·cm~(-1)at -30℃ respectively. The gel polymer electrolyte has good electrochemical stability up to 4.5V versus Li/Li~(+).The first charge-discharge efficiency of the polymer cell at 0.2C rate is almost 92.1%. The discharge capacity of the cell at 1.0C rate is 95% of the capacity at the 0.2C rate and the discharge capacity of the cell at -20℃ is 72% of the capacity at the 20℃. The charge-discharge capacity of the polymer cell is stable with charge-discharge cycling.

Key words: In-situ, Polymer electrolyte, Conductivity, Polymer lithium ion battery

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