一种基于铁的酸阴极材料用于K-离子电池
Dipannita Saha1, Parth Desai1, Ankur Sharma1
1Advanced Batteries and Ceramics Laboratory, Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, 400076, India.
ChemSusChem
|November 9, 2024
概括
一种基于铁的新型酸,KFePO4F,证明了稳定和可逆的离子储存. 这种地球上丰富的材料显示了可持续的K离子电池应用的前景.
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
- 固态化学 固态化学
背景情况:
- 开发可持续的,富含土壤的阴极材料,用于离子电池,对于下一代能源存储至关重要.
- 塔沃里特结构的酸由于其结构稳定性,为电化学应用提供了潜力.
研究的目的:
- 为了合成和表征一种新型的tavorite结构的铁酸 (KFePO4F) 作为离子电池的阴极材料.
- 评估KFePO4F在可持续电池化学中的电化学性能,结构稳定性和潜在应用.
主要方法:
- 使用低成本前体合成KFePO4F.
- 使用X射线衍射,拉曼光谱,FTIR,XPS,Mössbauer和ESR进行结构和结合分析.
- 电化学评估包括静电循环,循环电压测量,以及 ex-situ/operando同步射线衍射.
- 使用KFePO4F作为阴极的K-离子全电池的制造和测试.
主要成果:
- KFePO4F被成功合成为一种稳定于空气的,塔沃里特结构的材料,在正方体系统中结晶.
- 可逆离子提取/插入在1.5-4.0V范围内实现了~102 mAh/g的容量和高库伦比效率 (>99.9%从第二个周期).
- 操作同步衍射证实了在循环过程中没有相变的可逆结构变化,由可逆Fe-redox支持.
结论:
- 在地球上丰富的KFePO4F是可持续离子电池的有希望的阴极材料.
- 它的稳定结构,可逆电化学性能和低成本合成使其成为当前电池材料的可行替代品.
- 进一步开发可能会导致高效和环保的储能解决方案.
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