在薄膜固态电池中的Fe-LiF转换阴极的电化学激活
Joel Casella1, Jȩdrzej Morzy1, Evgeniia Gilshtein1
1Laboratory for Thin Films and Photovoltaics, Empa - Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.
ACS nano
|January 29, 2024
概括
研究人员开发了新的铁和化 (Fe-LiF) 固态电池阴极. 由于纳米结构化,这些阴极在2000个循环后显示出显著的容量增长和提高效率.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 过渡金属化物 (TMF) 转换阴极的能量密度比间隔阴极更高.
- TMF阴极面临的挑战包括缓慢的动力学,低效率和电解质不兼容性.
研究的目的:
- 研究共蒸发的异构铁和化 (Fe-LiF) 阴极.
- 评估它们在使用LiPON电解质和金属阳极的薄膜固态电池中的性能.
主要方法:
- 制造共蒸发的Fe-LiF异构阴极.
- 用LiPON电解质和金属阳极组装薄膜固态电池.
- 在6C速率下,电化学循环细胞2000个周期,在C/3.6.6时进行容量分析.
主要成果:
- 在2000个循环中,电压效率 (37-53%) 和特定容量 (146-216 mAh/g) 的逐步提高.
- 在C/3.6.6的2000个循环后,达到480 mAh/g (接近理论上的498 mAh/g) 的阴极容量.
- 观察到电化学激活的纳米结构,包括铁相粗化和积累,以及LiF相积累.
结论:
- 同蒸发的Fe-LiF阴极在固态电池中表现出有希望的性能.
- 电化学激活和纳米结构是循环期间容量增强的关键.
- 这些发现为先进的高能量密度固态电池铺平了道路.
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