Reforming Magnet Waste to Prussian Blue for Sustainable Sodium-Ion Batteries
Publication Name
ACS Applied Materials and Interfaces
Abstract
Increasing generation of permanent magnet waste has resulted in an urgent need to preserve finite resources. Reforming these wastes as feedstock to produce renewables is an ideal strategy for addressing waste and energy challenges. Herein, our work reports a smart and sustainable strategy to convert iron in magnet wastes into Prussian blue analogues that can serve as cathode materials for sodium-ion batteries. Moreover, a method to control feed rates is proposed to generate high-quality materials with fewer [Fe(CN)6] vacancies at a feed rate of 3 mL min-1. The recycled Na1.46Fe[Fe(CN)6]0.85·□0.15shows low vacancies and excellent cycling stability over 300 cycles (89% capacity retention at 50 mA g-1). In operando, evidence indicates that high-quality Prussian blue allows fast sodium-ion mobility and a high degree of reversibility over the course of cycling, although with a three-phase-transition mechanism. This study opens up a future direction for magnet waste created with the expectation of being environmentally reused.
Open Access Status
This publication is not available as open access
Volume
14
Issue
42
First Page
47747
Last Page
47757
Funding Number
PXM2019_014204_500031
Funding Sponsor
National Natural Science Foundation of China