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在NASICON阴极中使用高性兴奋剂:激活V⁴⁺/V⁵⁺氧化还原对,并诱导先进离子电池的可逆单固溶液相反应

Binghao Lin¹, Xu Wu¹, Xuejie He¹

¹College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, PR China.

Journal of colloid and interface science

|March 15, 2025

概括

高性兴奋剂通过提高导电性和稳定性来增强离子电池阴极 (NVP). 这种新的HE-NVP材料显示出先进的离子电池的优良容量保留和高能量密度.

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) 对大规模储能充满希望.
Na3V2(PO4)3 (NVP) 提供了结构稳定性,但由于导电性差和高压降解而受到损害.
现有的NVP阴极表现出有限的速率能力和容量衰减.

研究的目的:

为SIBs设计高性能阴极材料.
为了克服使用高性兴奋剂的传统NVP阴极的局限性.
为了提高NVP的电化学性能,用于实际的SIB应用.

主要方法:

通过引入六个金属离子 (Mn,Ca,Mg,Al,Zr,Nb) 进入Na3V2(PO4) 3.3.4的V位点来实现高的兴奋剂策略.
合成的高性阴极材料:Na3V1.73 ((Mn,Ca,Mg,Al,Zr) 0.05Nb0.02 ((PO4) 3 (HE-NVP).) 的合成.
电化学表征包括循环性能,速率能力和结构分析.

主要成果:

高性兴奋剂在~4V时激活可逆的V4+/V5+氧化还原对,增强能量密度.
诱导单个固体溶液相位过渡,改善结构稳定性,体积变化仅为1.1%.
HE-NVP 阴极在 0.5C 提供 122.1 mAh g-1,在 5C 进行 500 个循环后保持 90.1% 的容量.

结论:

高性兴奋剂是一种有效的策略,可以提高SIB的NVP阴极的性能.
该HE-NVP材料表现出优越的电化学性能,包括高容量,优良的稳定性和速率能力.
这项工作为设计下一代离子电池的先进阴极材料提供了有价值的方法.

关键词:

具有高度的.纳+) 储存储存的方式.Na(3)V(2)(PO(4))(3)) 没有问题.离子电池是一种离子电池.V(4+/5+) 的氧化还原对.

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