提高高实际容量的Na-NiCl电池的速率能力,使用石墨烯固NiFe纳米粒子作为阴极
Guowei Xiong1,2, Xiangwei Wu1,2, Zhaoyin Wen1,2
1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|April 3, 2025
概括
这项研究引入了-铁纳米粒子在减少的氧化石墨烯 (NiFe@RGO) 上,用于高温-化电池. NiFe@RGO电极实现了高面积容量和稳定的循环,提高了电池的性能.
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:
- 平面高温化 (Na-NiCl2) 电池具有储能潜力.
- 一个关键的挑战是在高电流密度下实现高面积容量.
研究的目的:
- 开发用于Na-NiCl2电池的新型电极材料.
- 为了提高Na-NiCl2电池的面积容量和速度性能.
主要方法:
- 在减少的石墨烯氧化物 (NiFe@RGO) 上固定的铁纳米颗粒的合成.
- 使用NiFe@RGO电极制造和对Na-NiCl2电池进行电化学测试.
- 在现场电化学阻抗光谱 (EIS) 和直流内部电阻 (DCIR) 分析.
主要成果:
- NiFe@RGO电极 (≈10重%Fe) 在14.67 mA cm-2 时实现了≈6.7 mAh cm-2 的面积容量,并在200个周期内在11 mA cm-2 时保持了98.4%的容量.
- 一个高面积负载阴极 (150 mg cm-2) 在19.25 mA cm-2下提供了18.7 mAh cm-2并显示了450-500周期的长期稳定性.
- 在循环过程中,NiFe@RGO电极表现出较低的界面阻抗和内部电阻,这有助于其优越的速率能力.
结论:
- NiFe@RGO是高温Na-NiCl2电池的有效电极材料,显著提高了面积容量和速率性能.
- 增强的RGO导电性和最小化的Fe偏振有助于电池的性能.
- 这项研究为设计用于苛刻应用的先进Na-NiCl2电池提供了途径.
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