Both layered trihydroxide hollow cubes and bismuth oxide derived from MOF templates for high-performance alkaline batteries

Abstract

Aqueous alkaline rechargeable batteries (ARBs) have huge potential in energy storage equipment because of their low cost, safety and high ionic conductivity. However, the performance of actual ARBs is largely limited by electrode materials. Here, the CoNiMn-LDH cathode with a hollow cubic structure and the Bi₂O₃ anode with a rod-shaped structure were successfully prepared using MOFs as templates. Compared with binary CoNi-LDH, the ternary CoNiMn-LDH has a larger voltage window, higher capacity, and faster charge transport dynamics and ion diffusion dynamics. A full battery was assembled with CoNiMn-LDH and Bi₂O₃, and exhibited a high specific capacity of 247.32 mA h g⁻¹ at 1 A g⁻¹. It exhibited cycling stability for up to 1400 cycles and its capacity retention was 87% at 4 A g⁻¹. In addition, a high energy density of 120 W h kg⁻¹ could also be achieved at a power density of 4219 W kg⁻¹. This study provides an instructive paradigm for the design and preparation of advanced electrode materials for full batteries.