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Enhancing the Cycling Stability of Sodium Metal Electrodes by Building an Inorganic-Organic Composite Protective Layer
- Enhancing the Cycling Stability of Sodium Metal Electrodes by Building an Inorganic-Organic Composite Protective Layer
- Kim, Yun-Jung; Lee, Hongkyung; Noh, Hyungjun; Lee, Jinhong; Kim, Seokwoo; Ryou, Myung-Hyun; Lee, Yong Min; Kim, Hee-Tak
- DGIST Authors
- Lee, Yong Min
- Issue Date
- ACS Applied Materials and Interfaces, 9(7), 6000-6006
- Article Type
- Owing to the natural abundance of sodium resources and their low price, next-generation batteries employing an Na metal anode, such as Na-O2 and Na-S systems, have attracted a great deal of interest. However, the poor reversibility of an Na metal electrode during repeated electrochemical plating and stripping is a major obstacle to realizing rechargeable sodium metal batteries. It mainly originates from Na dendrite formation and exhaustive electrolyte decomposition due to the high reactivity of Na metal. Herein, we report a free-standing composite protective layer (FCPL) for enhancing the reversibility of an Na metal electrode by mechanically suppressing Na dendritic growth and mitigating the electrolyte decomposition. A systematic variation of the liquid electrolyte uptake of FCPL verifies the existence of a critical shear modulus for suppressing Na dendrite growth, being in good agreement with a linear elastic theory, and emphasizes the importance of the ionic conductivity of FCPL for attaining uniform Na plating and stripping. The Na-Na symmetric cell with an optimized FCPL exhibits a cycle life two times longer than that of a bare Na electrode. © 2017 American Chemical Society.
- American Chemical Society
- Related Researcher
Lee, Yong Min
Battery Materials & Systems LAB
Battery; Electrode; Electrolyte; Separator; Simulation
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- Department of Energy Science and EngineeringBattery Materials & Systems LAB1. Journal Articles
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