Work

High Performances Aqueous Nickel-bismuth Batteries Assembled with Highly Crystalline Bi2O3 and CoNi-CoNiO2@NiCo Layered Double Hydroxides Heterostructure Nanoarrays

Year: 2025

Type: article

Abstract: Bi2O3 as prospective anode active materials for aqueous rechargeable nickel-bismuth batteries, is confronted with limited capacity and cycling durability. Herein, highly crystalline Bi2O3 with a tousled, cookie-like microstructure was synthesized by calcining Bi2O2CO3 precursors. The as-prepared Bi2O3 delivers a remarkable specific capacity of 266.7 mAh/g at 2 A/g and 203.3 mAh/g at 20 A/g, while maintaining 62.6% of its initial capacity after 1900 cycles at 15 A/g. For the cathode, heterostructured nanoarrays consisting of CoNiO2 and Co-Ni alloy cores grown on nickel foam, coated with nickel-cobalt layered double hydroxide shells, exhibit excellent electrochemical performance, with specific capacities of 249.7 mAh/g at 1 A/g and 112.0 mAh/g at 20 A/g. The assembled aqueous nickel-bismuth battery achieves a maximum energy density of 34.8 Wh/kg and a power density of 4400.5 W/kg at 1 A/g. These outstanding energy storage properties are attributed to the synergistic effect of the highly crystalline, tousled Bi2O3 anode and the heterostructured nanoarray cathode.

Source: Journal of Electrochemical Science and Technology

DOI: 10.33961/jecst.2025.00780