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Abstract
The addition of electrolyte additives is widely regarded as one of the most effective methods of improving the electrochemical performance of a battery. This study uses succinonitrile as a typical representative of nitrile film-forming additives to improve the film-forming stability of δ-MnO2/KMnF3 as the potassium ion battery cathode. The strong interaction between the –CN group of the nitrile and the metal ion on the cathode surface will enhance the stability of the solid electrolyte interface film. Electrochemical impedance spectroscopy is used to study the interface phenomena during charge and discharge. The mechanism of the film-forming additives is predicted and explained. These new design concepts will create a higher possibility of improving the battery cycle stability.
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