期刊
ACS APPLIED MATERIALS & INTERFACES
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c13639
关键词
magnet waste; recycle; Prussian blue; sodium-ion battery; cathode materials
资金
- National Key Research and Development Program of China
- Program of Top Disciplines Construction in Beijing
- Zhejiang Province Science Foundation
- National Natural Science Foundation of China
- [2021YFB3500800]
- [PXM2019_014204_500031]
- [LZ21E010001]
- [52171217]
This study presents a smart and sustainable strategy to convert iron in magnet wastes into cathode materials for sodium-ion batteries. High-quality materials with low vacancies were achieved by controlling feed rates. The recycled materials exhibited low vacancies and excellent cycling stability, allowing fast sodium-ion mobility and a high degree of reversibility.
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 center dot 0.15 shows 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.
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