Potassium metal batteries with high–performance via regulation of an electrolyte solvation structure
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Potassium metal batteries are most attention to a new type of low-cost and high-energy storage devices. However, the thermodynamic instability of the K–metal anode in organic electrolyte solutions results in uncontrolled growth of dendrites[1]. In this presentation, I will introduce the advanced electrolyte with dual–salt for regulated solvation chemistry. DFT calculations suggested that dual–salt into the electrolyte solution decreased the number of free solvent molecules surrounding the K+ leading to facile K+ desolvation as well as lowering the exchange current density following the uniform electrodeposition. The modified electrolyte showed less decomposition of the electrolyte and mechanical rigidity of the SEI layer on the surface. Even under high current density, the modified electrolyte ensures an long lifespan with stable Coulombic efficiency for full battery. References [1] J.–Y. Hwang et. al, J. Mater. Chem. A 2020, 8, 16718–16737.