A three-dimensional interconnected polymer/ceramic composite as a thin film solid electrolyte
A three-dimensional interconnected polymer/ceramic composite as a thin film solid electrolyte
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DOI：
10.1016/j.ensm.2019.12.031
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发表时间：
2020-04
影响因子：
20.4
通讯作者：
Max J. Palmer;S. Kalnaus;Marm B. Dixit;A. Westover;K. Hatzell;N. Dudney;X. C. Chen
中科院分区：
文献类型：
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作者：
Max J. Palmer;S. Kalnaus;Marm B. Dixit;A. Westover;K. Hatzell;N. Dudney;X. C. Chen
在这项工作中，我们介绍了一种方法来制造固体复合电解质膜，是薄的，离子导电的，机械坚固的，具有良好的可制造性的潜力，在锂金属电池的应用。首先采用水溶液喷涂法制备了厚度约为25 μm的掺杂磷酸铝钛锂陶瓷薄膜。该膜被部分烧结以形成具有致密骨架的三维互连结构。然后用可交联的聚（环氧乙烷）（PEO）基聚合物电解质回填。该复合材料具有77 wt%（61 vol%）的非常高的陶瓷负载量和在20 °C下3.5 × 10-5 S/cm的离子电导率，活化能为0.43 eV。主要的离子传输途径是通过陶瓷网络，通过建模预测和实验验证。由于陶瓷的互连结构，复合电解质表现出大大改善的机械强度。
In this work we introduce an approach to fabricate a solid composite electrolyte film that is thin, ionically conductive, and mechanically robust with good potential for manufacturability, in the application of lithium metal batteries. First a doped-lithium aluminum titanium phosphate ceramic thin film with thickness of ~25 μm is formed by aqueous spray coating, a scalable process. The film is partially sintered to form a three-dimensionally interconnected structure with a dense backbone. It is then backfilled with a crosslinkable poly(ethylene oxide) (PEO)-based polymer electrolyte. The composite has very high ceramic loading of 77 wt% (61 vol%) and an ionic conductivity of 3.5 × 10-5S/cm at 20 °C with an activation energy of 0.43 eV. The main ion transport pathway is through the ceramic network, predicted by modelling and verified by experiments. Owing to the interconnected structure of the ceramic, the composite electrolyte exhibits much improved mechanical strength.