쿠커비트릴 기반의 유기 다공성 물질의 이온 전도 특성과 응용

Abstract

This thesis describes the synthesis, structures and applications of organic porous materials. In our group, they have already demonstrated that structural characteristics having confined 1D-channels in organic porous material can make highly anisotropic proton conduction and containing guest molecules such as water and HCl molecule influence activity of proton conduction. Thus, we investigated and proposed proton conduction mechanism through single crystal X-ray crystallography and 2H-NMR spectroscopy, and organic molecular porous materials applied as solid electrolyte of lithium-ion battery by simple soaking method. In chapter 2, A new type of solid lithium-ion conducting electrolytes prepared by incorporation of Li+ ions into a cucurbit[6]uril (CB[6]) based organic molecular porous solid shows high Li+ ion conductivity (~10-4 S/cm) and mobility (transference number, tLi+ = 0.7 ~ 0.8). In addition, the solid electrolytes show excellent, thermally stable performance even after several temperature cycles. The results described here represent a significant progress in designing and tailoring of a safe and high performing solid electrolyte which can address the existing challenges in lithium ion battery technologies and may bring a new insight into the development of advanced lithium ion battery. In chapter 3, Proton conduction mechanism of an organic molecular porous material was analyzed by 2H NMR spectroscopy and X-ray single crystal structure. Proton conductivity in porous materials is mainly depending on the guest molecules filling the channels of the materials. Organic molecular porous materials comprising cucurbit[6]uril (CB[6]) containing deuterated guest molecules were prepared for temperature?dependent 2H NMR analysis. Line shape analysis and activation energy values calculated from T1 relaxation time allowed developing a proton conduction mechanism model. 2H-NMR spectroscopy in various temperature give a clue of proton motion and magnitude of hydrogen bonding networks inside channels of D2O containing porous CB[6] and protonated water (D3O+) and hydrochloric acid (DCl) containing porous CB[6]. Finally, existence of acid inside channel forms strong hydrogen bonding as proton conduction pathway and effective proton hoping compared to only water containing porous CB[6]. This work presents a state of the art for crystalline porous materials in proton conduction mechanism study.