NiCr-Cl LDH/rGO Composite as Anode Material for Sodium-Ion Batteries

Layered double hydroxides (LDHs) have attracted increasing attention as anode materials for sodium-ion batteries (SIBs) due to their high theoretical specific capacity and simple preparation method. However, LDHs used as anode materials for SIBs still suffer from sluggish diffusion kinetics and huge volume change during the charge and discharge process, resulting in poor cycling performance and rate capability. Therefore, we fabricated a Cl--intercalated NiCr layered double hydroxide/reduced graphene oxide (NiCr-Cl LDH/rGO) composite as an anode material for SIBs. Compared with pure NiCr-CO3 LDH and NiCr-CO3 LDH/rGO electrodes, the NiCr-Cl LDH/rGO electrode exhibited excellent cycling performance and rate capability, with the highest specific capacity of 218 mAh g(-1) at current density of 100 mA g(-1) for 200 cycles and 219 mAh g(-1) at current density of 2.0 A g(-1). The superior Na+ ion storage performance is attributed to the large interlayer spacing and the good electrical conductivity and flexibility of rGO. This work could provide a new path for constructing LDH-based composites as anode materials for SIBs in the field of energy storage.

Automated summary

Layered double hydroxides (LDHs) have high theoretical specific capacity and simple preparation method, but suffer from slow diffusion kinetics and electrochemical instability. By fabricating Cl--intercalated NiCr LDH/rGO composite, the cycling performance and rate capability are improved, showing superior Na+ ion storage performance.