Lithium ion mobility in poly(vinyl alcohol) based polymer electrolytes as determined by 7Li NMR spectroscopy

被引:125
作者
Every, HA
Zhou, F
Forsyth, M
MacFarlane, DR [1 ]
机构
[1] Monash Univ, Dept Chem, Clayton, Vic 3168, Australia
[2] Monash Univ, Dept Mat Engn, Clayton, Vic 3168, Australia
关键词
poly(vinyl alcohol); conductivity; Li-7; NMR; electrolytes;
D O I
10.1016/S0013-4686(97)10085-8
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Solvent-free polymer electrolytes based on poly(vinyl alcohol) (PVA) and LiCF3SO3 have shown relatively high conductivities (10(-8)-10(-4) S cm(-1)), with Arrhenius temperature dependence below the differential scanning calorimeter (DSC) glass transition temperature (343 K). This behaviour is in stark contrast to traditional polymer electrolytes in which the conductivity reflects VTF behaviour. Li-7 nuclear magnetic resonance (NMR) spectroscopy has been employed to develop a better understanding of the conduction mechanism. Variable temperature NMR has indicated that, unlike traditional polymer electrolytes where the linewidth reaches a rigid lattice limit near T-g, the lithium linewidths show an exponential decrease with increasing temperature between 260 and 360 K. The rigid lattice limit appears to be below 260 K. Consequently, the mechanism for ion conduction appears to be decoupled from the main segmental motions of the PVA. Possible mechanisms include ion hopping, proton conduction or ionic motion assisted by secondary polymer relaxations. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1465 / 1469
页数:5
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