通过线性 (N=O) 离子在Fe[Fe(CN) 5 NO]中作为离子电池阴极,提高了可逆容量和循环稳定性
Qinghao Han1,2, Ya'nan Hu1,2, Shuting Gao1,2
1College of Materials and Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, Xiamen University, Xiamen, 361005, P. R. China.
ChemSusChem
|August 8, 2023
概括
用于离子电池 (SIB) 的新型铁酸正极材料减少了水晶和体积膨胀. 这提高了电池寿命和性能,为先进的SIB设计铺平了道路.
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:
- 普鲁士蓝色类似物 (PBA) 是用于离子电池 (SIB) 的具有成本效益的阴极材料.
- 在PBA中,过度的水晶和体积膨胀限制了它们的电化学性能和周期寿命.
- 开发具有改善结构稳定的PBA对于实际SIB应用至关重要.
研究的目的:
- 为了合成和表征一种新的铁酸 (PBN) PBA材料.
- 研究PBN结构对水晶含量和体积膨胀的影响.
- 评估PBN作为SIBs的阴极的电化学性能和循环稳定性.
主要方法:
- 合成铁化 (Fe[Fe(CN) 5NO]) 和与Fe[Fe(CN) 6进行比较.
- 结晶水含量和体积膨胀的实验性表征.
- 密度函数理论 (DFT) 计算来分析Na+扩散.
- 电化学测试包括容量,速率能力和循环稳定性测量.
主要成果:
- 与传统的PB (Fe[Fe(CN) [6]) 相比,PBN表现出明显较低的水晶和体积膨胀.
- PBN中的N=O键有效地降低了结构内的Na+扩散潜力.
- 未经修改的PBN阴极在50 mA g-1下实现了148.6 mAh g-1的容量.
- 在200个循环后,PBN保持了102.9 mAh g-1,表现出极好的循环稳定性.
结论:
- 铁酸 (PBN) 是一种有前途的PBA阴极材料,用于SIB,其减少了水晶水和体积膨胀的有害影响.
- PBN结构有助于改善Na+扩散和长期循环稳定性.
- 这项研究为SIBs设计高性能PBA阴极材料提供了洞察力.
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