Eco‐Degradable and Flexible Solid‐State Ionic Conductors by Clay‐Nanoconfined DMSO Composites
Eco‐Degradable and Flexible Solid‐State Ionic Conductors by Clay‐Nanoconfined DMSO Composites
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DOI：
10.1002/adsu.201900134
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发表时间：
2020-03
影响因子：
7.1
通讯作者：
Seunghyeon Lee;H. S. Hwang;Whirang Cho;Daseul Jang;Taesik Eom;David C. Martin;J. Wie;B. Shim
中科院分区：
文献类型：
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作者：
Seunghyeon Lee;H. S. Hwang;Whirang Cho;Daseul Jang;Taesik Eom;David C. Martin;J. Wie;B. Shim
固态电解质可以缓解与液体电解质的化学和热不稳定性相关的电化学能源系统的安全问题。虽然液体在电极之间提供无缝的离子传输和几乎完美的润湿性，但固态电解质需要表现出至少与液体电解质相当的电化学性能以及机械鲁棒性和柔性。本文报道了蒙脱土（MMT）/二甲基亚砜（DMSO）纳米复合材料的简易制备方法，该复合材料通过形成仿珍珠质的“砖和砂浆”结构而显示出高的离子电导率、机械强度和热稳定性。DMSO的分子受限结构通过X射线衍射峰证实，其晶面间距的d-间距略大于MMT。MMT/DMSO复合材料的机械强度和韧性分别为55.3 ± 4.8 MPa和210.2 ± 32.6 kJ m-2。室温下的离子电导率为100 × 10−4 S cm−1，热稳定性在−100至120 °C之间。光学半透明性、按需生态降解性和溶液可加工性共同使MMT/DMSO复合材料成为具有广泛固态电化学应用（包括电池）的独特材料。
Solid‐state electrolytes can alleviate the safety issues of electrochemical energy systems related to chemical and thermal instabilities of liquid electrolytes. While a liquid provides seamless ionic transport with almost perfect wettability between electrodes, a solid‐state electrolyte needs to demonstrate at least comparable electrochemical performance to liquid electrolytes as well as mechanical robustness and flexibility. Here, the facile preparation of montmorillonite (MMT)/dimethyl sulfoxide (DMSO) nanocomposites is reported, which show high ionic conductivities, mechanical strengths, and thermal stabilities by forming nacre‐mimetic “brick‐and‐mortar” structures. The molecularly confined structures of DMSO are confirmed by X‐ray diffraction peaks with d‐spacings of interplanar spacing that are slightly larger than MMTs. The MMT/DMSO composites have mechanical strengths and toughnesses of 55.3 ± 4.8 MPa and 210.2 ± 32.6 kJ m−2, respectively. The ionic conductivity is ≈2 × 10−4 S cm−1 at room temperature, and their thermal stability is in the range of −100 to 120 °C. The optical translucency, on‐demand eco‐degradability, and solution processability together make the MMT/DMSO composites unique materials with a wide range of solid‐state electrochemical applications including batteries.