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增强的电化学性能的Ca-化Na₃V₂(PO₄) ₂F₃/C阴极材料的离子电池

Diah Agustina Puspitasari^1,2, Jagabandhu Patra^3,4, Rahmandhika Firdauzha Hary Hernandha³

¹Department of Chemical and Materials Engineering, National Central University, 300 Jhong-Da Rd., Taoyuan 320, Taiwan.

ACS applied materials & interfaces

|December 19, 2023

概括

兴奋剂通过提高电子导电性和结构稳定性来增强酸 (NVPF) 阴极材料. 这为先进的电池应用提供了卓越的电化学性能和循环稳定性.

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:

酸化 (Na3V2(PO4)2F3,NVPF) 是一个具有NASICON结构的有前途的阴极材料,提供高电压和稳定性.
然而,其实际应用受到低电子导电性和低速率能力的限制.

研究的目的:

开发具有增强电化学性能的新型Ca-doped NVPF/C阴极材料.
研究Ca2+兴奋剂对NVPF的结构,电子导电性和电化学性能的影响.

主要方法:

使用Sol-gel和碳热还原方法合成了Ca-doped NVPF/C材料.
用X射线衍射 (XRD) 和密度函数理论 (DFT) 的计算来进行结构和电子属性分析.
通过充/放电循环测试来评估电化学性能.

主要成果:

二氧化兴奋剂并没有改变晶体结构,但扩大了晶格间距,增强了结构稳定性.
由于Ca2+的替代,DFT的计算表明频段间隙减少,电子导电性增加.
最佳的NVPF-Ca-0.05/C阴极实现了高的特异性容量 (124mAhg-1在0.1C,86mAhg-1在10C) 和70%的容量保留在10C1000次循环后.

结论:

胺可以有效地提高NVPF阴极材料的电子导电性和结构完整性.
加NVPF/C的增强电化学性能证明了其对高性能离子电池的潜力.
这项研究提供了关于通过异性兴奋剂设计先进的阴极材料的见解.

关键词:

在 Ca2+ 兴奋剂中.国家交通运输.骑自行车的稳定性骑自行车的稳定性密度函数理论密度函数理论电子导电性的电子导电性.

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