Potassium-Sulfur Battery with Highly Concentrated Electrolyte for Improved Cycling Stability and Power Capability
발표자
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초록
내용
Potassium-Sulfur (K-S) batteries are emerging as low-cost, high-capacity energy storage technologies. However, conventional K-S batteries have two critical issues that have not been successfully resolved: the dissolution of potassium polysulfide into the liquid electrolyte and the formation of K dendrites, resulting in low reversible capacity. In this presentation, we introduce a K-S battery composed of a high-concentration electrolyte (4.34 mol∙kg-1 potassium bis(fluorosulfonyl)imide in 1,2-dimethoxyethane) and a synthesized sulfurized polyacrylonitrile (SPAN) cathode. The change of the solvation structure in the electrolyte is confirmed by theoretical and experimental studies. Through our strategies, the proposed K-S battery can deliver a practical areal capacity and stable lifetime with high Coulombic efficiency.
References [1] H.-H. Ryu, H. H. Sun, S.-T. Myung, C. S. Yoon, Y.-K. Sun, Energy Environ. Sci. 2021, 14, 844.