VOCl as a Cathode for Rechargeable Chloride Ion Batteries |
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| Authors: | Ping Gao Dr M Anji Reddy Dr Xiaoke Mu Dr Thomas Diemant Le Zhang Dr Zhirong Zhao‐Karger Dr Venkata Sai Kiran Chakravadhanula Dr Oliver Clemens Prof?Dr R Jürgen Behm Prof?Dr Maximilian Fichtner |
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| Institution: | 1. Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU), Ulm, Germany;2. Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;3. Institute of Surface Chemistry and Catalysis, Ulm University, Ulm, Germany;4. Joint Research Laboratory Nanomaterials, University of Technology, Darmstadt, Germany |
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| Abstract: | A novel room temperature rechargeable battery with VOCl cathode, lithium anode, and chloride ion transporting liquid electrolyte is described. The cell is based on the reversible transfer of chloride ions between the two electrodes. The VOCl cathode delivered an initial discharge capacity of 189 mAh g?1. A reversible capacity of 113 mAh g?1 was retained even after 100 cycles when cycled at a high current density of 522 mA g?1. Such high cycling stability was achieved in chloride ion batteries for the first time, demonstrating the practicality of the system beyond a proof of concept model. The electrochemical reaction mechanism of the VOCl electrode in the chloride ion cell was investigated in detail by ex situ X‐ray diffraction (XRD), infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and X‐ray photoelectron spectroscopy (XPS). The results confirm reversible deintercalation–intercalation of chloride ions in the VOCl electrode. |
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| Keywords: | chloride ion batteries electrochemistry rechargeable batteries vanadium oxychloride |
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