화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.39, No.4, 621-626, July, 2015
DOI10.7317/pk.2015.39.4.621  Export Citation
단일이온 Poly(POEM-co-AMPSLi) 전해질에 대한 BF3 첨가효과
Effect of BF3 Inclusion on Poly(POEM-co-AMPSLi) Single-ion Polymer Electrolytes
최다인, 류상욱†
  • 충북대학교 공과대학 공업화학과
Da-In Choi, and Sang-Woog Ryu†
  • Department of Engineering Chemistry, College of Engineering, Chungbuk National University, Cheongju, Chungbuk 361-763, Korea
E-mail:
초록
본 연구에서는 다양한 조성의 poly(ethylene glycol) methyl ether methacryate(POEM)과 2-acrylamido-2-methyl-1-propanesulfonic acid(AMPS)를 함유하는 공중합체를 합성하고 Li2CO3와의 적정반응을 통해 단일이온 전도성 poly(POEM-co-AMPSLi)를 제조하여 전기화학적 특성을 평가하였다. 또한 고분자전해질에 BF3를 첨가하여 루이스산이 이온전도도 및 열적특성에 미치는 영향을 평가하였다. 제조된 고분자전해질은 0.93의 리튬이온 수송률이 관찰되어 단일이온 전도체임을 확인하고 6 V까지 전기화학적 안정성을 보여주었지만, 3.2×10-7 S/cm의 낮은 상온 이온전도도가 관찰되었다. 하지만, 고분자전해질에 대한 BF3첨가는 이온간 해리를 가능하게 하여 상온 이온전도도의 경우 [EO]:[Li] 비율 27:1에서 최대 1.3×10-5 S/cm의 높은 값을 얻을 수 있었다. 나아가 BF3 첨가는 리튬이온과 ethylene oxide기의 배위를 증가시켜 결과적으로 고분자전해질의 결정용융온도를 감소시키는 효과도 함께 나타내었다.
Single-ion conducting poly(POEM-co-AMPSLi)s were prepared by a radical polymerization of various amount of poly(ethylene glycol) methyl ether methacryate (POEM) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) followed by a titration with Li2CO3. The electrochemical properties and an effect of BF3inclusion on the ionic conductivity and thermal properties were investigated. The obtained polymer electrolytes showed electrochemical stability up-to 6 V and 0.93 of lithium ion transference number suggested that the electrolytes are one of the single-ion conductors but only 3.2×10-7 S/cm of room temperature ionic conductivity was observed. However, there was a dramatic increase of room temperature ionic conductivity after inclusion of BF3 and 1.3×10-5 S/cm was observed in polymer electrolyte with [EO]:[Li] ratio of 27:1. Furthermore, the inclusion of BF3 decreases the crystalline melting temperature of polymer electrolytes by increasing the coordination between lithium ion and ethylene oxide unit in the polymer matrix.
Keywords:polymer electrolytes;single-ion conductor;Lewis acid;ionic conductivity;melting temperature
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