BF_(3)LiMA를 단량체로 하는 고체 고분자전해질 합성과 전기화학적 특성
Synthesis and Electrochemical Properties of Solid Polymer Electrolytes Using BF_(3)LiMA as Monomer
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초록
합성된 BF_(3)LiMA 리튬염을 단량체로 사용하는 고체 고분자전해질을 제조하고 BF_(3)LiMA의 농도가이온전도도에 미치는 영향 및 전기화학적 안정성을 교류임피던스 측정법과 선형전위주사법을 통하여 평가하였다. 그 결과 BF3LiMA가 12.9 wt%인 고체 고분자전해질에서 7.71 × 10^(−6)S cm^(−1)의가장 높은 25℃ 이온전도도가 관찰되었으며 이 값을 전후로 이온전도도는 다소 감소하는 경향이나타났다. 이러한 결과는 저농도의 BF_(3)LiMA에서 발생할 수 있는 리튬염의 부족과 고농도의BF_(3)LiMA에서는 발생할 수 있는 고분자기질의 유동성 감소가 원인으로 해석된다. 또한BF_(3)LiMA기반의 고체 고분자전해질은 음이온이 고정되어 있는 자기-도핑형 계열로서 60℃에서6.0 V까지 우수한 전기화학적 안정성을 보여주었다.
Abstract
Solid polymer electrolytes using BF3LiMA as monomer were synthesized by usual one step radical polymerization in THF solvent. The effect of BF_(3)LiMA concentration on ionic conductivity and electrochemical stability was investigated by AC impedance measurement and linear sweep voltammetry. As a result, the highest ionic conductivity reached 7.71 × 10^(−6) S cm^(−1)at 25℃ was obtained in 12.9 wt% of BF3LiMA content. Further increase or decrease of BF_(3)LiMA content result to decrease the ionic conductivity due to the brittle matrix properties in former case and the insufficient number of charge carrier in the latter case. Furthermore,since the counter-anion was immobilized in the self-doped solid polymer electrolytes, high electrochemical stability up to 6.0 V was observed even in 60℃.
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