VOCl as a Cathode for Rechargeable Chloride Ion Batteries. Issue 13 (29th February 2016) - Gao, Ping
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. Abstract : Chloride shuttle : A rechargeable chloride ion battery is based on the reversible transfer of chloride ions between a VOCl cathode and lithium anode. A reversible capacity of 113 mAh g −1 can be retained after 100 cycles even at a high current density rating of 2 C. Key: (green) Cl −, ▪(blue) MClx (cathode), ▪(green) M′ (anode), →(red) discharging, ←green charging.