Folic acid-based supramolecules for enhanced stability in potassium ion batteries |
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| Institution: | 1. Laboratory of Environmental Sciences and Technology, Xinjiang Technical Institute of Physics & Chemistry, and Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830000, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun 130022, China;1. College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;2. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;1. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China;2. College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225002, China;1. Department of Physics, Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Laboratory for Soft Functional Materials Research, Xiamen University, Xiamen 361005, China;2. Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering, Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Jimei University, Xiamen 361021, China;3. School of Chemical Engineering, Shandong University of Technology, Zibo 255049, China;1. CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen 361021, China;4. State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;5. Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China |
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| Abstract: | Organics present significant prospects as environmentally friendly and sustainable electrode materials for potassium ion batteries (PIBs) because of their abundant, recyclable and highly customizable characteristics. However, small molecular organics are easily solubilized in organic electrolytes, resulting in a low capacity and poor stability. Herein, the folic acid-based supermolecules (SM-FAs) are successfully prepared by a hydrothermal assisted self-assembly strategy. Due to multi-locus hydrogen bonds (HBs) and the cyclized π-conjugated interactions, the structural stability of SM-FAs has been significantly improved, and the solubility in carbonate electrolytes has been effectively inhibited. As an anode for PIB, the SM-FA-6 sample exhibits a large capacity (206 mAh/g at 50 mA/g) and an outstanding cycle stability (capacity retention of 91% after 1000 cycles at 50 mA/g). More impressively, an integrative storage mechanism which combines both the general enolization reaction between C=O groups and K+, and the atypical π–K+ interaction within the assembled conjugation framework, is unraveled for potassium ion accumulation. It is envisioned that this facile self-assemble strategy opens up a promising avenue to modulate the stability of small molecular organic electrodes with enhanced storage capacity. |
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