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03159nam a2200577Ia 4500 |
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10.1002-eem2.12191 |
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220517s2022 CNT 000 0 und d |
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|a 25750348 (ISSN)
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|a Forging Inspired Processing of Sodium-Fluorinated Graphene Composite as Dendrite-Free Anode for Long-Life Na–CO2 Cells
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|b John Wiley and Sons Inc
|c 2022
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|z View Fulltext in Publisher
|u https://doi.org/10.1002/eem2.12191
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|a Na–CO2 batteries recently are emerging as promising energy-storage devices due to the abundance of Na in the earth's crust and the clean utilization of greenhouse gas CO2. However, similar to metallic Li, metallic Na also suffers from a serious issue of dendrite growth upon repeated cycling, while a facile method to solve this issue is still lacking. In this work, we report an effective, environmentally friendly method to inhibit Na dendrite growth by in situ constructing a stable, NaF-rich solid electrolyte interface (SEI) layer on metallic Na via adding a small amount (~3 wt%) of fluorinated graphene (FG) in bulk Na. Inspired by the forging processing, a uniform Na/FG composite was obtained by melting and repetitive FG-adsorbing/hammering processes. The Na/FG–Na/FG half cell exhibits a low voltage hysteresis of 110–140 mV over 700 h at a current density up to 5 mA cm−2 with an areal capacity as high as 5 mAh cm−2. Na–CO2 full cell with the Na/FG anode is able to sustain a stable cycling of 391 cycles at a limited capacity of 1000 mAh g−1. Long cycle life of the cell can be attributed to the protecting effect of the in situ fabricated NaF-rich SEI layer on metallic Na. Both experiments and density functional theory (DFT) calculations confirm the formation of the NaF-rich SEI layer. The inhibition effect of the NaF-rich SEI layer for Na dendrites is verified by in situ optical microscopy observations. © 2021 Zhengzhou University.
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|a Anodes
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|a Carbon dioxide
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|a Cells
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|a composite anode
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|a Cytology
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|a Dendrite growth
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|a Density functional theory
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|a Earth's crust
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|a Energy storage
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|a Facile method
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|a fluorinated graphene
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|a Forging
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|a Graphene
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|a Graphene composites
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|a Greenhouse gases
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|a Inhibition effect
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|a Limited capacity
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|a Low voltages
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|a Na dendrite
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|a Na–CO2 battery
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|a NaF-rich protecting layer
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|a Phase interfaces
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|a Sodium
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|a Sodium compounds
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|a Sodium metallography
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|a Solid electrolyte interfaces
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|a Solid electrolytes
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|a Structural geology
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|a Chen, X.
|e author
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|a Cheng, H.
|e author
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|a Lu, Y.
|e author
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|a Mao, Y.
|e author
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|a Tu, J.
|e author
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|a Xie, J.
|e author
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|a Xu, X.
|e author
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|a Zhang, T.
|e author
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|a Zhao, X.
|e author
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|a Zhu, T.
|e author
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|t Energy and Environmental Materials
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