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Bipolar Polymeric Protective Layer for Dendrite-Free and Corrosion-Resistant Lithium Metal Anode in Ethylene Carbonate Electrolyte |
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| Authors: | Dr. Chenglong Deng Dr. Binbin Yang Dr. Yaohui Liang Dr. Yi Zhao Boshun Gui Dr. Chuanyu Hou Dr. Yanxin Shang Jinxiang Zhang Dr. Tinglu Song Prof. Xuzhong Gong Prof. Nan Chen Prof. Feng Wu Prof. Renjie Chen |
| Affiliation: | 1. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China Advanced Technology Research Institute, Beijing Institute of Technology, Jinan, 250300 China Contribution: Conceptualization (lead), Data curation (lead), Formal analysis (lead), Project administration (equal), Software (lead), Writing - original draft (lead), Writing - review & editing (lead);2. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China Contribution: Data curation (supporting), Software (supporting);3. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China Contribution: Conceptualization (supporting), Data curation (supporting);4. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China Advanced Technology Research Institute, Beijing Institute of Technology, Jinan, 250300 China Contribution: Writing - original draft (supporting);5. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China Contribution: Software (supporting);6. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China Contribution: Data curation (equal), Software (supporting);7. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China Advanced Technology Research Institute, Beijing Institute of Technology, Jinan, 250300 China Contribution: Data curation (supporting);8. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China Contribution: Data curation (supporting);9. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049 China;10. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China;11. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China Advanced Technology Research Institute, Beijing Institute of Technology, Jinan, 250300 China Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, 100081 China Contribution: Funding acquisition (supporting) |
| Abstract: | The unstable interface between Li metal and ethylene carbonate (EC)-based electrolytes triggers continuous side reactions and uncontrolled dendrite growth, significantly impacting the lifespan of Li metal batteries (LMBs). Herein, a bipolar polymeric protective layer (BPPL) is developed using cyanoethyl (−CH2CH2C≡N) and hydroxyl (−OH) polar groups, aiming to prevent EC-induced corrosion and facilitating rapid, uniform Li+ ion transport. Hydrogen-bonding interactions between −OH and EC facilitates the Li+ desolvation process and effectively traps free EC molecules, thereby eliminating parasitic reactions. Meanwhile, the −CH2CH2C≡N group anchors TFSI− anions through ion-dipole interactions, enhancing Li+ transport and eliminating concentration polarization, ultimately suppressing the growth of Li dendrite. This BPPL enabling Li|Li cell stable cycling over 750 cycles at 10 mA cm−2 for 2 mAh cm−2. The Li|LiNi0.8Mn0.1Co0.1O2 and Li|LiFePO4 full cells display superior electrochemical performance. The BPPL provides a practical strategy to enhanced stability and performance in LMBs application. |
| Keywords: | Lithium metal anode Bipolar polymeric protective layer Hydrogen bond interaction Ion-dipole interaction Li+ desolvation |