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Anion-modulated Ion Conductor with Chain Conformational Transformation for stabilizing Interfacial Phase of High-Voltage Lithium Metal Batteries |
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| Authors: | Chao Wang Xiaoxue Zhao Dabing Li Dr. Chong Yan Qiang Zhang Li-Zhen Fan |
| Affiliation: | 1. Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083 P. R.China Contribution: Conceptualization (lead), Data curation (lead), Methodology (lead), Writing - original draft (lead), Writing - review & editing (lead);2. Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083 P. R.China Contribution: Visualization (equal), Writing - review & editing (equal);3. Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083 P. R.China Contribution: Visualization (supporting), Writing - review & editing (equal);4. Shanxi Research Institute for Clean Energy, Tsinghua University, Taiyuan, 030032 P. R.China;5. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P. R.China;6. Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083 P. R.China |
| Abstract: | In solid-state lithium metal batteries (SSLMBs), the inhomogeneous electrolyte-electrode interphase layer aggravates the interfacial stability, leading to discontinuous interfacial ion/charge transport and continuous degradation of the electrolyte. Herein, we constructed an anion-modulated ionic conductor (AMIC) that enables in situ construction of electrolyte/electrode interphases for high-voltage SSLMBs by exploiting conformational transitions under multiple interactions between polymer and lithium salt anions. Anions modulate the decomposition behavior of supramolecular poly (vinylene carbonate) (PVC) at the electrode interface by changing the spatial conformation of the polymer chains, which further enhances ion transport and stabilizes the interfacial morphology. In addition, the AMIC weakens the “Li+-solvation” and increases Li+ vehicle sites, thereby enhancing the lithium-ion transport number (tLi+=~0.67). Consequently, Li || LiNi0.8Co0.1Mn0.1O2 cell maintains about 85 % capacity retention and Coulombic efficiency >99.8 % in 200 cycles at a charge cut-off voltage of 4.5 V. This study provides a new understanding of lithium salt anions regulating polymer chain segment behavior in the solid-state polymer electrolyte (SPE) and highlights the importance of the ion environment in the construction of interfacial phases and ionic conduction. |
| Keywords: | Solid Polymer Electrolyte Interface Phase Interfacial Chemistry Solid-State Lithium Metal Batteries |