Lithium surface protection by polyacetylene in situ polymerization

被引：49

作者：

Belov, D. G. ^{[1
]}

Yarmolenko, O. V. ^{[1
]}

Peng, A. ^{[1
]}

Efimov, O. N. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Region, Russia

来源：

SYNTHETIC METALS | 2006年 / 156卷 / 9-10期

关键词：

polyacetylene polymerization; polyolefin/polyacetylene separator; Li surface protection; impedance spectra;

D O I：

10.1016/j.synthmet.2006.04.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Direct acetylene polymerization at ambient temperature on a Li metal surface and polyolefin separator with Ziegler-Natta catalyst was developed. Thin conducting polyacetylene films with strong adhesion to Li or polyolefin surface was formed and studied by electrochemical methods. AC impedance measurements and charge/discharge tests were applied for prepared coin cells with LiCoO2 as a cathode material in the presence of 1 M LiPF6 in dimethyl carbonate, ethylene carbonate, propylene carbonate (5:3:2 vol) electrolyte. Three kinds of polyolefins were used to prepare composite separators with polyacetylene: polypropylene (PP), polyethylene (PE) and three-layer type: PP-PE-PP. The polyacetylene film thickness on Li metal or polyolefin separator was easily controlled by catalyst concentration and polymerization time. It was shown that high ionic conductivity (7.5 x 10(-5) S cm(-1)) might be achieved due to higher porosity of a polyethylene separator. Li-polyacetylene electrodes showed highest ionic conductivity and stability in charge/discharge tests. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：745 / 751

页数：7

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