Zang Xiaoling, Wang Xusheng, Liu Haili, Ma Xinlei, Wang Weijian, Ji Junhui, Chen Jitao, Li Rui, Xue Mianqi
Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Beijing 100190 , China.
Department of Chemistry , Renmin University of China , Beijing 100872 , China.
ACS Appl Mater Interfaces. 2020 Feb 26;12(8):9347-9354. doi: 10.1021/acsami.9b22470. Epub 2020 Feb 11.
Aqueous zinc-ion batteries (AZIBs) are one of the promising choices for the future large-scale grid energy storage, in which Mn-based cathode materials have the advantages of low cost and environmental friendliness. However, their capacity delivery and cycling stability are limited by the large bulk-induced incomplete zincation and structure pulverization. Here, we develop a strategy of epitaxial polymerization in the liquid phase to fabricate two-dimensional (2D) MnO/polypyrrole nanosheets to enhance the zinc-ion storage by realizing the efficient utilization of active materials and improving the structural stability via a polymerized framework. An ultrahigh capacity of 408 mAh g is demonstrated at 1C rate, and an excellent capacity retention of 78% is realized after 2800 cycles at 5C rate for the AZIB. Electrochemical and morphological characterizations reveal that the unique 2D structure contributes to both the electron/ion conductivity and structural stability. The epitaxial polymerization of the conducting polymer in the liquid phase provides a new perspective to the synthesis of high-performance electrode materials and 2D conducting polymers.
水系锌离子电池（AZIBs）是未来大规模电网储能的理想选择之一，其中锰基正极材料具有低成本和环境友好的优点。然而，它们的容量输出和循环稳定性受到大量体积引起的不完全锌化和结构粉化的限制。在此，我们开发了一种液相外延聚合策略，以制备二维（2D）MnO/聚吡咯纳米片，通过实现活性材料的高效利用和通过聚合框架提高结构稳定性来增强锌离子存储。在1C倍率下展示了408 mAh g的超高容量，对于水系锌离子电池，在5C倍率下循环2800次后实现了78%的优异容量保持率。电化学和形态表征表明，独特的二维结构有助于电子/离子传导率和结构稳定性。导电聚合物在液相中的外延聚合为高性能电极材料和二维导电聚合物的合成提供了新的视角。
