Realization of High Capacity and Cycling Stability in Pb‐Free A₂CuBr₄ (A=CH₃NH₃/Cs, 2 D/3 D) Perovskite‐Based Li‐Ion Battery Anodes

Abstract

Lead-free hybrid and inorganic perovskites (A₂ CuBr₄ ; A=CH₃ NH₃ or Cs, 2 D or3 D) are synthesized by a room-temperature solid-state reaction route and examined as anode materials in Li-ion batteries. A remarkably high reversible capacity of 630 mAh g^-1 is realized in the 2 D hybrid perovskite at 100 mA g^-1 at the end of 140 cycles. A full cell with this anode is also tested and shows impressive cycling stability. A good reversible capacity of 420 mAh g^-1 with excellent stability tested up to 1400 cycles is also obtained for the 3 D perovskites. Pb-free hybrid/inorganic halide perovskites can thus be used as viable anode materials for battery applications.