The Synthesis of Manganese Hydroxide Nanowire Arrays for a High-Performance Zinc-Ion Battery.

ABSTRACT: The morphology, microstructure as well as the orientation of cathodic materials are the key issues when preparing high-performance aqueous zinc-ion batteries (ZIBs). In this paper, binder-free electrode Mn(OH)₂ nanowire arrays were facilely synthesized via electrodeposition. The nanowires were aligned vertically on a carbon cloth. The as-prepared Mn(OH)₂ nanowire arrays were used as cathode to fabricate rechargeable ZIBs. The vertically aligned configuration is beneficial to electron transport and the free space between the nanowires can provide more ion-diffusion pathways. As a result, Mn(OH)₂ nanowire arrays yield a high specific capacitance of 146.3 Ma h g^-1 at a current density of 0.5 A g^-1. They also demonstrates ultra-high diffusion coefficients of 4.5 × 10^-8~1.0 × 10^-9 cm² s^-1 during charging and 1.0 × 10^-9~2.7 × 10^-11 cm^-2 s^-1 during discharging processes, which are one or two orders of magnitude higher than what is reported in the studies. Furthermore, the rechargeable Zn//Mn(OH)₂ battery presents a good capacity retention of 61.1% of the initial value after 400 cycles. This study opens a new avenue to boost the electrochemical kinetics for high-performance aqueous ZIBs.

SUBMITTER: Gong J 

PROVIDER: S-EPMC9331603 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature