کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9760353 | 1498046 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low dimensional polymer electrolytes with enhanced Li+ conductivities
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The structure of two amphiphilic low-dimensional copolymer electrolytes I of similar overall composition but prepared by different synthetic procedures is described. I are copolymers of poly [2,5,8,11,14-pentaoxapentadecamethylene(5-alkyloxy-1,3-phenylene)] (CmO5) and poly[2,-oxatrimethylene(5-alkyloxy-1,3-phenylene)] (CmO1) where the alkyl side chains having m carbons are mixed dodecyl/octadecyl (50/50). 1H NMR shows that the copolymers have only 18 and 13% of CmO5 units in which LiBF4 ions are separated by Li+ encapsulation in tetraethoxy segments but molecular modelling suggests that in ionophobic CmO1 units the salt is mostly present as neutral aggregates decoupled from the polymer. Conductivities of microphase-separated mixtures with salt-bridge amphiphilic polyethers II and III of each system are similar. They have low temperature dependence over the range 20-110 °C at â¼10â3 S cmâ1. A conduction mechanism is proposed whereby Li+ hopping takes place along rows of decoupled aggregates in an essentially block copolymer structure. Subambient measurements to â10 °C gave a conductivity of 4 Ã 10â5 S cmâ1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 146, Issues 1â2, 26 August 2005, Pages 418-422
Journal: Journal of Power Sources - Volume 146, Issues 1â2, 26 August 2005, Pages 418-422
نویسندگان
Y. Zheng, J. Liu, Y.-P. Liao, G. Ungar, P.V. Wright,