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具有稳定的结构和快速动力学的合金酸盐阴极,用于水性离子电池
Yongwei Tang1, Guo-Qing Ma1, Jin-Hong Li1
1Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xìan, Shaanxi 710049, China.
ACS applied materials & interfaces
|January 15, 2025
概括
通过共沉合成的六烯酸 (CoHCF) 为水性离子电池提供了更好的性能,由于其优化的结构,显示出高容量和优良的循环寿命.
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:
- 普鲁士蓝色类似物 (PBA) 是水性离子电池的有希望的阴极材料,因为它们具有高压,开放的框架和可负担性.
- 然而,固有的空缺和水晶水限制了PBA的性能,导致容量低和循环寿命差.
研究的目的:
- 合成具有较低含水量和较高表面积的良好结晶的六化 (CoHCF).
- 为了评估合成的CoHCF作为水性离子电池的阴极的电化学性能.
主要方法:
- 简单的共降方法用于CoHCF合成.
- 电化学测试包括静电电荷放电,循环电压测量和电化学阻抗光谱.
- 现场X射线衍射 (XRD) 用于结构分析.
主要成果:
- 合成的CoHCF具有较高的特定表面积和较低的水含量.
- CoHCF在0.02Ag-1下提供104.6mAhg-1的容量,在0.5Ag-1下300个循环后保持92.4%的容量.
- 电化学动力学表明电容主导的电荷储存和 Zn2+ 扩散系数为~10-9 cm2 s-1.
- 现场XRD证实了可逆的Zn2+插入/提取,没有相变.
结论:
- 联合降水合成的CoHCF显示出作为水性离子电池的阴极的优异电化学性能.
- 该材料的特性,包括减少空位和含水量,有助于提高其容量和循环稳定性.
- 这些发现强调了CoHCF作为下一代高性能水性离子电池的可行候选人.
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