CAJ | 학술논문

以聚环氧乙烷（PEO）为黏结剂，离子导电性的 Li1.5Al0.5Ge1.5(PO4)3（LAGP）为主相，乙腈为溶剂，按照EO/Li，摩尔比为13，变化LiN(CF3SO2)2（LiTFSI）中Li+与LAGP中Li+的比例，通过溶液浇注法制备得到LAGP-PEO(LiTFSI)固体复合电解质。用X射线衍射、扫描电镜（SEM）和电化学阻抗（EIS）等方法对固体复合电解质的形貌、结构和电导率进行表征。结果表明，LAGP 可与 PEO(LiTFSI)部分络合并均匀分散于PEO(LITFSI)内，整个体系内存有三个主体相，即PEO(LiTFSI)的复合相、LAGP晶相以及PEO与两种锂盐的过渡相。通过阻抗谱图发现，当质量比w(LAGP)∶w(PEO)=6∶4时，LAGP-PEO(LiTFSI)固体复合电解质具有最高的室温电导率，为2.68×10?5S/cm，在333 K时，达到1.86×10?4S/cm，接近LAGP的电导率水平。这说明固体复合电解质中加入LAGP即降低了PEO的结晶度，LAGP自身的电导率也有一定贡献。
이취배양을완（PEO）위점결제，리자도전성적 Li1.5Al0.5Ge1.5(PO4)3（LAGP）위주상，을정위용제，안조EO/Li，마이비위13，변화LiN(CF3SO2)2（LiTFSI）중Li+여LAGP중Li+적비례，통과용액요주법제비득도LAGP-PEO(LiTFSI)고체복합전해질。용X사선연사、소묘전경（SEM）화전화학조항（EIS）등방법대고체복합전해질적형모、결구화전도솔진행표정。결과표명，LAGP 가여 PEO(LiTFSI)부분락합병균균분산우PEO(LITFSI)내，정개체계내존유삼개주체상，즉PEO(LiTFSI)적복합상、LAGP정상이급PEO여량충리염적과도상。통과조항보도발현，당질량비w(LAGP)∶w(PEO)=6∶4시，LAGP-PEO(LiTFSI)고체복합전해질구유최고적실온전도솔，위2.68×10?5S/cm，재333 K시，체도1.86×10?4S/cm，접근LAGP적전도솔수평。저설명고체복합전해질중가입LAGP즉강저료PEO적결정도，LAGP자신적전도솔야유일정공헌。
PEO-based solid composite electrolyte with the fast ion conductor LAGP(Li1.5Al0.5Ge1.5(PO4)3) as a main ionic conductive component and PEO as the binder were prepared by the solution casting method with fixedn(EO)/n(Li)=13, but varying ratio of LiTFSI to LAGP. The structure and morphology of the solid composite electrolyte were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The conductivity of LAGP-PEO(LiTFSI) electrolyte was analyzed by electrical impedance spectroscopy (EIS). The results show that LAGP is partially complexed with PEO(LiTFSI) and homogeneously distributed in PEO(LiTFSI). Three phases are present, a pure crystalline LAGP phase, amorphous PEO(LiTFSI) phase and a transition phase of the LAGP particles and amorphous PEO(LiTFSI). Withw(LAGP)∶w(PEO)=6∶4, the optimal ionic conductivity for LAGP-PEO(LiTFSI) solid composite electrolyte is 2.68×10?5S/cm at room temperature and 1.86×10?4S/cm at 373 K which is close to the LAGP. It means that the LAGP addition contributes to the improvements of ionic conductivity not only by prohibiting crystallization but also due to its own ionic conductivity.