Morphology of PI-PEO block copolymers for lithium batteries

被引:20
作者
Xue, Chenchen
Meador, Mary Ann B.
Zhu, Lei
Ge, Jason J.
Cheng, Stephen Z. D.
Putthanarat, Sirina
Eby, R. K.
Khalfan, Ameesh
Bennett, George D.
Greenbaum, Steve G.
机构
[1] NASA, Glenn Res Ctr, Div Mat, Cleveland, OH 44135 USA
[2] Univ Akron, Maurice Morton Inst Polymer Sci, Akron, OH 44325 USA
[3] Univ Connecticut, Inst Mat Sci, Storrs, CT 06269 USA
[4] Univ Connecticut, Dept Chem Engn, Storrs, CT 06269 USA
[5] Univ Dayton, Dayton, OH 45469 USA
[6] CUNY Hunter Coll, Dept Phys, New York, NY 10021 USA
基金
美国国家卫生研究院;
关键词
lithium batteries; solid polymer electrolytes; morphology;
D O I
10.1016/j.polymer.2006.06.024
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polyimide (PI)-polyethylene oxide (PEO) block copolymers have a wide variety of applications in microelectronics, since PI-PEO films exhibit a high degree of thermal and chemical stability. The polymers consist of short, rigid rod T-shaped PI segments, alternating with flexible, PEO coil segments. The highly incompatible PI rods and PEO coils should phase-separate, especially in the presence of lithium ions used as electrolytes for lithium polymer batteries. The rigid rod phase provides a high degree of dimensional stability. In this paper, we provide evidence by DSC that the self-assembled ordered structure of the PI-PEO molecules is formed from concentrated solution rather than the bulk state. Tapping mode AFM and X-ray diffraction are applied to observe the nanodomains in the phase separation of the PI and PEO before and after doping with lithium ions. In addition, we report evidence of the ion transport primary mechanism, in the amorphous phase of the lithium salt-doped PI-PEO block copolymers' multinuclear NMR linewidth, spin-lattice relaxation time, and pulsed field gradient diffusion measurements. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:6149 / 6155
页数:7
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