基于铁的普鲁士蓝色类似物用于离子电池的同结构合成
Yijie Liu1, Siwei Fan1, Yun Gao1
1School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
Small (Weinheim an der Bergstrasse, Germany)
|June 28, 2023
概括
研究人员为离子电池 (SIB) 开发了基于铁的普鲁士蓝色类似物 (PBA). 修改合成增加了含量和结晶性,提高了电化学性能和稳定性,用于大规模储能.
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:
- 可充电离子电池 (SIB) 对于大规模储能至关重要.
- 基于铁的普鲁士蓝色类似物 (PBA) 由于其开放的框架和成本效益,提供了一个有前途的阴极材料.
- 在增加含量和减少PBA缺陷方面仍然存在挑战.
研究的目的:
- 合成具有改善含量和结构完整性的同结构PBA.
- 在修改合成条件下研究PBA的结构演变.
- 评估离子电池中新型PBAs的电化学性能.
主要方法:
- 在受控条件下合成同结构普鲁士蓝模拟物 (PBAs).
- 从立方到单临床阶段的结构演变的表征.
- 电化学测试包括充电能力,速率性能和全电池组装.
- 在现场拉曼光谱和粉末X射线衍射 (PXRD) 用于机制验证.
主要成果:
- 一系列同结构PBAs被成功合成,表现出从立方到单临床的相变.
- 在修改后的PBA中观察到含量增加和结晶性增强.
- 优化的铁六酸盐 (Na1.75Fe[Fe(CN) 6 0.9743·2.76H2O) 显示出高充电能力 (150mAhg-1在0.1°C) 和优异的速率能力 (74mAhg-1在50°C).
- 可逆Na+离子间隔/脱间隔通过现场技术得到证实.
- 一个完整的电池组装了优化的PBA阴极和硬碳阳极,显示出优越的电化学性能.
结论:
- 经过修改的合成条件使PBA中的含量和结晶性得以提高.
- 开发的基于铁的PBA在SIB应用中表现出卓越的电化学性能.
- 了解结构-属性关系对于推进用于储能的PBA阴极材料至关重要.
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