Interlayer-spacing regulation of NiFe LDH nanosheets cathode with high rate performance for chloride ion battery

Abstract

Chloride ion batteries (CIBs) possess the multiple advantages of high theoretical volumetric energy density, abundant precursor resources and high safety due to the dendrit-free characteristic, which provide more choices and opportunities for electrochemical energy storage. In this work, NiFe LDH nanosheets with different interlayer spacing are prepared using a simple co-precipitation method with the interlayer spacing of LDH nanosheets extended from 7.695 Å to 24.114 Å. Expanding interlayer space of LDHs nanoplates helps to the promote ion diffusion and enhance their action kinetics. Additionally, the increased oleophobicity between NiFe LDH nanosheets cathode with increased interlayer spacing and solvent PC is beneficial for the structural stability of the materials during cycling. Compared with typical chloride ion-intercalated NiFe LDH nanosheets, the NiFe-CHO LDH with the maximum interlayer spacing demonstrates a performance improvement of about 213 % (with a discharge specific capacity of 64.2 mAh/g after 200 cycles) at high current density and good rate performance. This work provides a simple and effective interlayer spacing control strategy for the design of CIBs cathodes under high current density.