All‐Solid‐State Chloride‐Ion Battery with Inorganic Solid Electrolyte
Ryo Sakamoto, Nobuaki Shirai, Atsushi Inoishi, Shigeto Okada
Abstract
Abstract Chloride‐ion batteries have some attractive properties such as high energy density and low cost. However, they have poor cycle performance because chloride as an active material tends to dissolve into a polar solvent. Herein, an all‐solid‐state chloride‐ion battery is demonstrated with KCl‐doped PbCl 2 as a solid electrolyte to suppress the dissolution of chloride. The all‐solid‐state cell with BiCl 3 as the cathode had an initial discharge capacity of 187 mAh g −1 , which corresponds to 73 % of the theoretical capacity of BiCl 3 . Moreover, it exhibited better cyclability compared to the previously reported non‐aqueous cell with BiCl 3 cathode. During the charge‐discharge process, XRD and XPS analysis confirmed the unique behavior of conversion reaction by Cl − anion, where Bi is produced by discharging and BiCl 3 returns by charging.