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Rechargeable metal–sulfur batteries show great promise for energy storage applications because of their potentially high energy and low cost. The multivalent‐metal based electrochemical system exhibits the particular advantage of the feasibility of dendrite‐free metal anode. Calcium (Ca) represents a promising anode material owing to the low reductive potential, high capacity, and abundant natural...
In article number 2001806, Zhirong Zhao‐Karger and co‐workers report room‐temperature rechargeable calcium–sulfur (Ca–S) batteries enabled by a stable and efficient Ca[B(hfip)4]2 electrolyte. The Ca–S batteries exhibit a cell voltage close to its thermodynamic value and good reversibility. The mechanism of the redox reactions in this new battery system involves the transformation of calcium‐polysulfide...
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