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Designing Solvated Double-Layer Polymer Electrolytes with Molecular Interactions Mediated Stable Interfaces for Sodium Ion Batteries |
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| Authors: | Jun Pan Yuchen Zhang Fu Sun Markus Osenberg André Hilger Ingo Manke Ruiguo Cao Shi Xue Dou Hong Jin Fan |
| Institution: | 1. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371 Singapore;2. Hefei National Laboratory for Physical Science at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026 China
These authors contributed equally to this work.;3. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101 China;4. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz?1, 14109 Berlin, Germany;5. Hefei National Laboratory for Physical Science at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026 China;6. Institute of Energy Materials Science, University of Shanghai for Science and Technology, Shanghai, 200093 China |
| Abstract: | Unstable cathode-electrolyte and/or anode-electrolyte interface in polymer-based sodium-ion batteries (SIBs) will deteriorate their cycle performance. Herein, a unique solvated double-layer quasi-solid polymer electrolyte (SDL-QSPE) with high Na+ ion conductivity is designed to simultaneously improve stability on both cathode and anode sides. Different functional fillers are solvated with plasticizers to improve Na+ conductivity and thermal stability. The SDL-QSPE is laminated by cathode- and anode-facing polymer electrolyte to meet the independent interfacial requirements of the two electrodes. The interfacial evolution is elucidated by theoretical calculations and 3D X-ray microtomography analysis. The Na0.67Mn2/3Ni1/3O2|SDL-QSPE|Na batteries exhibit 80.4 mAh g?1 after 400 cycles at 1 C with the Coulombic efficiency close to 100 %, which significantly outperforms those batteries using the monolayer-structured QSPE. |
| Keywords: | Double-Layer Polymer Electrolytes Functional Filler Molecular Intercalation Quasi-Solid-State Sodium Ion Batteries Stable Interfaces |