Abstract
Stable Li metal anodes have become the driving factor for high-energy-density battery systems. However, uncontrolled growth of Li dendrite hinders the application of rechargeable Li metal batteries (LMBs). Here, a multifunctional electrolyte additive bisfluoroacetamide (BFA) was proposed to facilitate high-performance LMBs. The uniform and dense deposition of Li+ was achieved due to the reduced nucleation and plateau overpotential by the addition of BFA. Moreover, X-ray photoelectron spectroscopy (XPS) tests reveal a gradient solid electrolyte interface (SEI) structure on the Li metal surface. Cyclic voltammetry (CV) curves at different sweep speeds prove the formation of pseudocapacitance at the electrode-electrolyte interface, which accelerates the Li+ transport rate and protects the electrode structure. The low activation energy also indicates the ability of rapid Li+ transportation in electrolyte bulk. Therefore, the Li∥Li symmetric cells with 1.0 wt.% BFA electrolyte exhibit good cycling performance at 0.5 mA·cm−2 for over 2000 h, and Li∥LiNi0.6Co0.2Mn0.2O2 (NCM622) full cells maintain a high capacity for 200 cycles at 1 C rate.
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Acknowledgements
This work was supported by the Joint Funds of the National Natural Science Foundation of China (No. U2130204), the S&T Major Project of Inner Mongolia Autonomous Region in China (No. 2020ZD0018), and Beijing Outstanding Young Scientists Program (No. BJJWZYJH01201910007023).
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A gradient solid electrolyte interphase with high Li+ conductivity induced by bisfluoroacetamide additive for stable lithium metal batteries
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Sun, Z., Wen, Z., Chen, Y. et al. A gradient solid electrolyte interphase with high Li+ conductivity induced by bisfluoroacetamide additive for stable lithium metal batteries. Nano Res. 16, 8425–8432 (2023). https://doi.org/10.1007/s12274-022-5363-6
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DOI: https://doi.org/10.1007/s12274-022-5363-6