Journal
CHEMICAL ENGINEERING SCIENCE
Volume 282, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2023.119295
Keywords
Dendrite-free; Potassium metal anode; NaNO3; Carbonate electrolyte
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A novel mechanical-electrochemical stability enhancement interface is constructed for potassium metal batteries, reducing side reactions and relieving interface stress, resulting in excellent performances and durable stability.
With their high-energy density and low-price advantage, potassium (K) metal batteries have been considered the next generation of energy storage system. However, applications of K metal anode are always obstructed by severe side reactions and rapid growth of K dendrites upon cycles due to the fragile solid electrolyte interface (SEI). Herein, a novel mechanical-electrochemical stability enhancement interface is constructed through potassium salt anion structure design and in-situ ion exchange reaction, which enables SEI with reducing side reactions and relieving interface stress during cycling process. The batteries with the designed SEI could deliver excellent performances with a high average Coulombic Efficiency of 95.91 %, a critical current density of 7.5 mA cm-2 and a durable stability of more than 1350 h (0.1 mA cm-2). This work provides an effective strategy to construct a high-energy and stable K metal anode interface and will inspire the electrolyte design for other alkali metal batteries.
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