Nanoscale Mapping of Extrinsic Interfaces in Hybrid Solid Electrolytes
Nanoscale Mapping of Extrinsic Interfaces in Hybrid Solid Electrolytes
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DOI：
10.1016/j.joule.2019.11.015
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发表时间：
2020-01-15
期刊：
影响因子：
39.8
通讯作者：
Hatzell, Kelsey B.
中科院分区：
文献类型：
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作者：
Dixit, Marm B.;Zaman, Wahid;Hatzell, Kelsey B.
无机-有机杂化固体电解质是一种很有前途的全固态电池材料体系。这些电解质包含许多固体-固体界面，这些界面控制着传输路径、电极垂直杆电解质的兼容性和耐用性。本文评价了电极垂直杆、电解液界面和电解液结构对电化学性能的影响。原子力显微镜技术揭示了一系列模型杂化固体电解质中机械、粘合和形态特性的变化。使用同步加速器纳米层析成像技术将这些测量结果映射到亚表面微结构特征。具有较短聚合物链的杂化固体电解质表现出比具有较长聚合物链的杂化固体电解质更高的附着力(>；100nN)、杨氏模数(6.4 GPA)、容量(114.6毫安/克)和容量保持(92.9%)。非本征界面性质在很大程度上决定了ASSB的电化学性能。对无机成分的微观结构控制可以提供一种在杂化固体电解质中调整界面性质的方法。
Inorganic-organic hybrid solid electrolytes are promising material systems for all solid-state batteries (ASSBs). These electrolytes contain numerous solid-solid interfaces that govern transport pathways, electrode vertical bar electrolyte compatibility, and durability. This paper evaluates the role that electrode vertical bar electrolyte interfaces and electrolyte structure have on electrochemical performance. Atomic force microscopy techniques reveal how mechanical, adhesion, and morphological properties transform in a series of model hybrid solid electrolytes. These measurements are mapped to sub-surface microstructurel features using synchrotron nano-tomography. Hybrid solid electrolytes with shorter polymer chains demonstrate a higher adhesion (>100 nN), Young's Modulus (6.4 GPa), capacity (114.6 mAh/g), and capacity retention (92.9%) than hybrid electrolytes with longer polymer chains (i.e., higher molecular weight). Extrinsic interfacial properties largely dictate electrochemical performance in ASSBs. Microstructurel control over inorganic constituents may provide a means for tailoring interfacial properties in hybrid solid electrolytes.