A paper-based membrane coated by graphitic carbon nitride (g-C3N4) is prepared via a dip-coating method and used as a separator for sodium metal batteries with merits of low cost and environment-friendliness. Introduction of g-C3N4 effectively improves the ionic conductivity and the structural stability of the separator. Compared with traditional polyethylene separators and Al2O3-coated separators, the g-C3N4-coated separators show better electrolyte wettability, thermal stability, and electrochemical stability. Therefore, Na||Na3V2(PO4)3 battery using the g-C3N4-coated separator exhibits better cycling stability and higher rate capability. These results prove that the g-C3N4-coated paper-based separator is expected to become the next generation of low-cost and high-safety separator in sodium metal batteries.
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This study was supported by the National Natural Science Foundation of China (Grant Nos. 21676067, 52072105 and 21606065), the Anhui Provincial Natural Science Foundation (Grant No. 1908085QE178), and the Fundamental Research Funds for the Central Universities (Grant No. JZ2020YYPY0109).
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Wu, L., Yao, X., Liu, Y. et al. A g-C3N4-coated paper-based separator for sodium metal batteries. J Solid State Electrochem (2021). https://doi.org/10.1007/s10008-021-04921-1
- Sodium metal batteries