Abstract
In this study, a safe and environmental friendly new all-solid-state copper-ion battery composed of Bi2Se3 anode, RbCu4Cl3I2 electrolyte and copper cathode was constructed for the first time. The electrochemical reaction processes during the charging and discharging were revealed. There are two electrochemical reaction processes in this new Cu ion battery. At the scanning rate of 0.5 mVs−1, Cu+ reversibly intercalated as an interstitial into van der wales layer of two-dimensional Bi2Se3 crystal when applying a reversible maximum voltage of 0.5 V. With further increase the maximum voltage up to 0.8 V, Cu+ undergoes a conversion reaction with Bi2Se3, reducing Bi2Se3 into Bi metal concomitantly forming Cu2Se. The irreversible conversion reaction is predominant capacitive process, while the reversible intercalation process is a diffusion-controlled process. The charge and discharge of this all-solid-state copper ion battery demonstrates that it can achieve repeated charge and discharge behavior, which shows perspective as a new all-solid-state rechargeable battery especially for the application in some special field.
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