Structure and transport properties of polymer gel electrolytes based on PVdF-HFP and LiN(C2F5SO2)2

被引:98
作者
Capiglia, C
Saito, Y
Kataoka, H
Kodama, T
Quartarone, E
Mustarelli, P
机构
[1] Osaka Natl Res Inst, Ikeda, Osaka 5638577, Japan
[2] Univ Pavia, CSTE, I-27100 Pavia, Italy
[3] Univ Pavia, Dept Phys Chem, I-27100 Pavia, Italy
关键词
gel polymer electrolytes; PVDF-HFP; LiN(C2F5SO2)(2) [BETI] diffusion coefficients; pulsed-field gradient NMR;
D O I
10.1016/S0167-2738(00)00678-0
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Gel polymer electrolytes composed of PVdF/HFP and a non-aqueous lithium electrolyte solution EC/DEC/LiN(C2F5SO2)(2) (BETI) were prepared to investigate the conduction properties of the gel materials. Structural and micro-structural characterization was carried out by means of modulated differential scanning calorimetry (MDSC) and scanning electron microscopy (SEM). The samples with polymer/solution weight ratios higher than 0.5 contain at least an amorphous swollen gel phase and a crystalline one, while a pure liquid phase appears, which occupies cavities in the micrometer range in the gels with lower polymer content. The transport properties of the gels were investigated by means of impedance spectroscopy for conductivity and pulsed-field gradient nuclear magnetic resonance (PFG-NMR) for diffusion coefficients. The results were compared with those of corresponding films prepared with LiN(CF3SO2)(2) (TFSI). The BETI-based samples showed diffusion values lower than the TFSI-based ones. Estimation of the carrier concentration change with the gel composition revealed that the interaction between the host polymer and the electrolyte in the gel especially in the polymer rich region (> 50 wt%). (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:291 / 299
页数:9
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