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Highly concentrated “‘water‐in‐salt”’ (WIS) electrolytes are promising for high‐performance energy storage devices due to their wide electrochemical stability window. However, the energy storage mechanism of MnO2 in WIS electrolytes‐based supercapacitors remains unclear. Herein, MnO2 nanoflowers are successfully grown on mesoporous bowl‐like carbon (MBC) particles to generate MnO2/MBC composites,...