Wang Liang-Yu, Cai Zhi-Peng, Ma Chao, Wang Kai-Xue, Chen Jie-Sheng
Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
College of Smart Energy, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
ACS Appl Mater Interfaces. 2023 Sep 20;15(37):44364-44372. doi: 10.1021/acsami.3c10751. Epub 2023 Sep 5.
Metal-organic frameworks (MOFs) with well-defined porous structures and highly active frameworks are considered as promising electrode materials for sodium-ion batteries (SIBs). However, the structure pulverization upon sodiation/desodiation impacts on their practical application in SIBs. To address this issue, poly(-phenylenediamine) (PPA) was uniformly coated onto the surface of MIL-88A, a typical Fe-based MOF through in situ polymerization initiated by the metal ions (Fe) of MIL-88A. Used as an anode material for SIBs, the PPA-coated MIL-88A, denoted as PPA@MIL-88A, showed significantly improved electrochemical performance. A reversible capacity as high as 230 mAh g was achieved at 0.2 A g even after 500 cycles. MIL-88A constructed with electrochemically active Fe and fumaric acid ligands guarantees the high specific capacity, while the PPA polymer coating effectively inhibits the pulverization of MIL-88A. This work provides an efficient strategy for improving the structure and cycling stability of MOFs-based electrode materials.
具有明确多孔结构和高活性骨架的金属有机框架材料（MOFs）被认为是钠离子电池（SIBs）很有前景的电极材料。然而，在 sodiation/desodiation 过程中的结构粉化影响了它们在 SIBs 中的实际应用。为了解决这个问题，通过由 MIL-88A 的金属离子（Fe）引发的原位聚合反应，将聚（对苯二胺）（PPA）均匀地涂覆在典型的铁基金属有机框架 MIL-88A 的表面。用作 SIBs 的阳极材料时，涂覆有 PPA 的 MIL-88A，记为 PPA@MIL-88A，表现出显著改善的电化学性能。即使在 500 次循环后，在 0.2 A g 的电流密度下仍实现了高达 230 mAh g 的可逆容量。由具有电化学活性的 Fe 和富马酸配体构建的 MIL-88A 保证了高比容量，而 PPA 聚合物涂层有效地抑制了 MIL-88A 的粉化。这项工作为改善基于 MOFs 的电极材料的结构和循环稳定性提供了一种有效的策略。
