A novel solid composite polymer electrolyte based on poly(ethylene oxide) segmented polysulfone copolymers for rechargeable lithium batteries

作者：Lu, Qingwen; Fang, Jianhua; Yang, Jun^*; Yan, Gengwei; Liu, Sisi; Wang, Jiulin

来源：Journal of Membrane Science, 2013, 425: 105-112.

DOI：10.1016/j.memsci.2012.09.038

• Composite polymer electrolyte
• Poly(ethylene oxide) segmented polysulfone copolymer
• Plastic crystal
• Rechargeable lithium battery

It is a compelling challenge to develop solid polymer electrolyte membranes for rechargeable battery with both high ionic conductivity and superior mechanical performance. In this study, we first prepare a new type of all-solid-state composite polymer electrolyte from lithium bis-trifluoromethanesulphonimide (LiTESI), succinonitrile (SN) and poly(ethylene oxide) segmented polysulfone copolymers (PSF-PEO) with various PEO contents in low molecular weight (Mn = 1500 Da), which are synthesized by condensation polymerization. The optimized composite polymer electrolyte PSF-PE035+LiTESI+SN membrane exhibits a remarkable amorphous state; leading to its ionic conductivity of 1.6 x 10(-4) S cm(-1) at room temperature. Especially, the tensile strength of the PSF-PE035+LiTESI+SN electrolyte membrane is still more than 4.3 MPa at 80 degrees C, indicating its excellent mechanical property and high thermal stability in a wide temperature range. Li symmetric cell and Li/LiFePO4 cell with the above electrolyte display low voltage polarization and good rechargeability. The test results indicate that the solid PSF-PE035+LiTESI+SN composite electrolyte membrane is a promising candidate for future applications in rechargeable lithium batteries.

• 出版日期2013-1-1
• 单位上海交通大学