在Na3V2(PO4)3中三次替代的协同效应,用于高速率和长寿命的无阳极SIB
Ruoyu Chen1, Dongdong Li2, Xinyu Zhang3
1School of Mechanical and Intelligent Manufacturing, Fujian Chuanzheng Communications College, Fuzhou 350007, China.
ACS applied materials & interfaces
|July 21, 2025
概括
用,和硫酸盐离子对酸 (NVP) 进行三级兴奋剂,可显著提高离子电池的性能. 这种增强可以改善先进的储能解决方案的导电性和充放电率.
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:
- 离子电池 (SIB) 是离子电池的一个有希望的替代品.
- 由于其高容量和电压,Na3V2(PO4) 3 (NVP) 是一个潜在的SIB阴极材料.
- 较差的内在导电性限制了NVP的实际应用.
研究的目的:
- 为了提高SIB的NVP阴极的电化学性能.
- 调查三元兴奋剂对NVP导电性和离子迁移的影响.
- 为下一代电池开发基于NVP的高性能阴极.
主要方法:
- 简单的sol-gel合成方法.
- 用K+,Al3+和SO4{2-}) 离子对NVP进行三级兴奋剂.
- 理论计算以确认 Na+ 迁移加速.
- 电化学性能测试 (容量,速度能力,循环稳定性).
主要成果:
- 经过三次性兴奋剂的NVP表现出改善的Na+迁移和导电性.
- 值得注意的可逆容量在0.5C时为115.3 mA·hg-1,在50C时为79.1 mA·hg-1.
- 用SO4(2-) 杂的NVP在0.5C时显示了90.6 mA·hg-1和10C时显示了85 mA·hg-1.
- 没有阳极的全细胞表现出令人印象深刻的长期循环稳定性.
结论:
- 与单离子兴奋剂相比,Ternary替换为NVP阴极提供了更高的性能.
- 开发的NVP材料适用于高充放电率和高能量密度的SIB.
- 这项研究为基于NVP的NASICON阴极提供了坚实的基础,作为离子电池的可行替代品.
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