数字农科院2.0

Self-Assembly of Ultrathin, Ultrastrong Layered Membranes by Protic Solvent Penetration

文献类型： 外文期刊

作者： Li, Chuang;Zhang, Mengtian;Li, Peixuan;Ren, Hong-Rui;Wu, Xian;Piao, Zhihong;Xiao, Xiao;Zhang, Mingxin;Liang, Xiangyu;Wu, Xinru;Chen, Biao;Li, Hong;Han, Zhiyuan;Liu, Ji;Qiu, Ling;Zhou, Guangmin;Cheng, Hui-Ming

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期刊名称： JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

ISSN： 0002-7863

年卷期： 2024 年 146 卷 5 期

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收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： Flexible membranes with ultrathin thickness and excellent mechanical properties have shown great potential for broad uses in solid polymer electrolytes (SPEs), on-skin electronics, etc. However, an ultrathin membrane (<5 mu m) is rarely reported in the above applications due to the inherent trade-off between thickness and antifailure ability. We discover a protic solvent penetration strategy to prepare ultrathin, ultrastrong layered films through a continuous interweaving of aramid nanofibers (ANFs) with the assistance of simultaneous protonation and penetration of a protic solvent. The thickness of a pure ANF film can be controlled below 5 mu m, with a tensile strength of 556.6 MPa, allowing us to produce the thinnest SPE (3.4 mu m). The resultant SPEs enable Li-S batteries to cycle over a thousand times at a high rate of 1C due to the small ionic impedance conferred by the ultrathin characteristic and regulated ionic transportation. Besides, a high loading of the sulfur cathode (4 mg cm(-2)) with good sulfur utilization was achieved at a mild temperature (35 degrees C), which is difficult to realize in previously reported solid-state Li-S batteries. Through a simple laminating process at the wet state, the thicker film (tens of micrometers) obtained exhibits mechanical properties comparable to those of thin films and possesses the capability to withstand high-velocity projectile impacts, indicating that our technique features a high degree of thickness controllability. We believe that it can serve as a valuable tool to assemble nanomaterials into ultrathin, ultrastrong membranes for various applications.

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