Well‐dispersed FeOCl Nanosheets as High‐performance Chloride Ion Battery Cathode Material

Abstract

Thermal decomposition method has been widely used to synthesize FeOCl materials with simple process and low requirements for devices. However, the FeOCl particles show nonuniform size and are easy to grow up together with the rapid reaction. The formed aggregates contribute to the poor cyclic stability for chloride ion battery. Herein, NaCl template was developed to fabricate FeOCl nanosheets with uniform size of thermal decomposition method. When the Fe: Na molar ratio reached 1 : 10, the FeOCl nanosheets showed good dispersity and high chlorine content. The FeOCl‐1‐10‐NaCl cathode delivered a maximum discharge capacity of 145 mAh g−1 and an excellent capacity retention (80 %) over 50 cycles, due to the high particle dispersion in electrode slurry. With the amount of NaCl template increasing, the FeOCl‐1‐40‐NaCl cathode delivered a high initial discharge capacity of 173 mAh g−1, as a result of the low contact resistance and charge transfer resistance.