用于电池应用的高缩氧化酸.
Ki-Hun Nam1, Zhongling Wang2,3, Jessica Luo2,4
1Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
Chemistry of materials : a publication of the American Chemical Society
|May 20, 2024
概括
新的高氧化铁 (HESO) 材料提供了优越的离子电池阳极性能. 这些先进的材料在150个循环中保持高容量,性能优于传统的费里特.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 无机化学 无机化学
背景情况:
- 离子电池需要先进的阳极材料来改善能量存储.
- 传统的螺旋铁铁铁体在容量和循环稳定性方面存在局限性.
- 由于多金属组成,高材料具有独特的特性.
研究的目的:
- 合成和评估新型高氧化铁 (HESO) 材料作为半电池的转化阳极.
- 为了比较HESO的电化学性能与传统的螺旋铁.
- 阐明HESO在循环过程中的电化学反应机制.
主要方法:
- 燃烧合成用于准备四种不同的HESO电极材料,其中包含5-6种金属.
- 在半电池中评估了电化学性能,包括容量保留和循环稳定性.
- 采用X射线吸收光谱 (XAS) 来分析原始,放电和充电电极中的金属的氧化状态.
主要成果:
- 与Fe3O4和MgFe2O4.4相比,所有合成的HESO都表现出明显优异的电化学性能.
- 在大多数HESO材料中,容量超过600 mAh g-1在150个周期内保持.
- XAS揭示了在放电过程中Fe,Co,Ni和Cu的减少到元素状态,在充电时Fe的部分再氧化.
结论:
- 铁能够达到超过2+的氧化状态的能力对于观察到的高容量至关重要.
- 在化后形成金属元素的电子导电网络,增强了电荷传输.
- HESO材料代表了下一代离子电池转换阳极的一个有希望的类别.
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