Stabilization of Potassium Metal Anode with Unique Mechanism of Crown Ether Additive
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Potassium metal batteries (KMB) have advantages of low cost and high energy density, but widespread utilization is still hampered by K dendrite growth during continuous cycling. [1,2] We propose a novel strategy to protect the potassium metal anode by adding a crown ether to carbonate electrolyte. The strong interaction between K ion and the crown ether forms a highly reduction-resistant cation complex, which induces a positively charged electrostatic layer on the protrusions of the K metal anode surface. This unique mechanism inhibits K dendrite growth and prevents free solvent decomposition during long-term cycling. In summary, we present a K-metal anode stabilization strategy through crown ether addition and provide an effective direction for next-generation KMB research.
[1] J. Park, J.-Y. Hwang, W.-J. Kwak, J. Phys. Chem. Lett. 2020, 11, 7849–7856. [2] X. Tang, D. Zhou, P. Li, X. Guo, B. Sun, H. Liu, K. Yan, Y. Gogotsi, G. Wang, Adv. Mater. 2020, 32, 1906739.