A gel polymer electrolyte based on initiator-free photopolymerization for lithium secondary batteries

作者：Ryou Myung Hyun; Lee Yong Min; Cho Kuk Young; Han Gi Beom; Lee Je Nam; Lee Dong Jin; Choi Jang Wook; Park Jung Ki^*

来源：Electrochimica Acta, 2012, 60: 23-30.

DOI：10.1016/j.electacta.2011.10.072

• Thiol
• Acrylate
• Photopolymerization
• Gel polymer electrolyte (GPE)
• Lithium secondary batteries

Highly ion-conductive gel polymer electrolyte (GPE) with mechanical flexibility is developed by incorporating liquid electrolyte into polymer films that are fabricated by initiator-free photopolymerization of poly(ethylene glycol) dimethacrylate (acrylate monomer) and pentaerythritol tetrakis (3-mercaptopropionate) (thiol monomer) blend. When UV is irradiated on the blend, the thiol monomers themselves produce radicals to initiate the polymerization. GPEs with 40-50 wt.% of thiol monomer content show mechanically free standing characteristics with sufficient flexibility. The ionic conductivity of the GPE reaches 1.1 x 10(-3) S cm(-1) at 25 degrees C and is thus high enough to be applied for lithium secondary batteries. The GPE is electrochemically stable up to 4.4V versus Li/Li+ and the unit cells consisting of LiCoO2/GPE/lithium metal show good cycling performance. This GPE is thus considered a good electrolyte candidate for future flexible and wearable lithium secondary batteries.

• 出版日期2012-1-15