Dey Ananta, Ramlal Vishwakarma Ravikumar, Sankar Selvasundarasekar Sam, Mahapatra Tufan Singha, Suresh Eringathodi, Kundu Subrata, Mandal Amal Kumar, Das Amitava
Analytical and Environmental Science Division and Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002, India.
Academy of Scientific and Innovative Research (AcSIR), CSIR-Human Resource Development Centre, (CSIR-HRDC) Campus, Sector 19, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh 201 002, India.
ACS Appl Mater Interfaces. 2020 Dec 30;12(52):58122-58131. doi: 10.1021/acsami.0c17683. Epub 2020 Dec 17.
Crystalline two-dimensional organic nanosheets (2D-ONs) having atomic or near-atomic thickness with infinite lateral dimensions are of crucial significance for their possible application as a material for energy storage. The presence of nanofluidic channels with a designed array of molecular interlayers in such 2D-ONs, for a favorable lithium-ion transport, has special significance for improving the efficacy of lithium-ion batteries. However, the rational design of crystalline 2D-ONs remains a challenge because of the lack of appropriate monomers and convenient preparation methods. Herein, we report a unique lithium-ion conducting behavior of zwitterionic 2D-ONs, formed through self-assembly of a small organic molecule AM-1. Different microscopic studies confirm the near-atomic thickness (∼3.5 nm) of these 2D-ONs. Results of the single-crystal X-ray diffraction studies confirm the presence of a one-dimensional (1D) channel in crystalline 2D-ONs, which was generated during the self-assembly process of the zwitterionic monomer scaffold. The presence of immobilized ionic centers with well-defined directional channels in the 2D-ONs favors the transportation of lithium ions with a room-temperature lithium-ion conductivity of 5.14 × 10 S cm, which is rather unique for self-assembled 2D-ONs.
具有原子或近原子厚度且横向尺寸无限的晶体二维有机纳米片（2D-ONs）作为一种储能材料具有重要意义。这种2D-ONs中存在具有设计好的分子夹层阵列的纳米流体通道，有利于锂离子传输，这对于提高锂离子电池的效能具有特殊意义。然而，由于缺乏合适的单体和便捷的制备方法，晶体2D-ONs的合理设计仍然是一个挑战。在此，我们报道了通过小分子有机分子AM-1自组装形成的两性离子2D-ONs独特的锂离子传导行为。不同的微观研究证实了这些2D-ONs的近原子厚度（约3.5纳米）。单晶X射线衍射研究结果证实了晶体2D-ONs中存在一维（1D）通道，该通道是在两性离子单体支架的自组装过程中产生的。2D-ONs中固定化离子中心与明确的定向通道的存在有利于锂离子的传输，其室温锂离子电导率为5.14×10 S cm，这对于自组装的2D-ONs来说是相当独特的。
