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快速选适合兴奋剂过渡金属到Na₃V₂(PO₄)₂F₃用于具有高能量密度的离子电池在广泛的温度范围内

Lei Wang^1,2, Jiaqing Wang³, Henghui Chen⁴

¹College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang, 325035, P. R. China.

Advanced materials (Deerfield Beach, Fla.)

|April 24, 2025

概括

这项研究引入了一种更快的方法,可以为离子电池阴极找到更好的兴奋剂元素. 化酸 (NVPF-Fe) 具有优良的性能,非常适合广泛的温度应用.

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
计算材料科学科学计算材料科学

背景情况:

传统的Na3V2(PO4) 2F3 (NVPF) 的试错兴奋剂方法耗时.
提高NVPF的电子导电性和电化学性能对于先进的离子电池至关重要.

研究的目的:

开发一种快速选策略,以在NVPF中找到合适的兴奋剂元素.
为了提高NVPF阴极的电化学性能和导电性.
为离子电池确定一个优化的正极材料,具有高能量密度和广泛的温度适用性.

主要方法:

对于各种过渡金属合NVPF材料的带间隙的理论预测.
单晶NVPF-M (M = Ru, Fe, Ni, Ti, Cd) 材料的化学合成. 这些材料是:
半电池和全电池的电化学性能评估.
在现场进行X射线衍射分析以研究反应机制.

主要成果:

NVPF-Ru 和 NVPF-Fe 阴极表现出极好的循环稳定性 (2000 个循环),高库伦比效率和显著的速率容量 (20 C).
这些阴极在广泛的温度范围 (-30至60°C) 中表现出可行的应用能力.
在现场XRD证实了多相和固体溶液反应机制,在循环过程中晶格体积变化最小.

结论:

理论预测辅助合成方法有效地选了适合NVPF的兴奋剂元素.
NVPF-Fe阴极提供了令人信服的成本和性能平衡,代表了离子电池的最佳选择.
优化的NVPF-Fe阴极具有高能量密度和广泛的温度应用潜力.

关键词:

Na3V2(PO4)2F3F2F3 Na3V2(PO4)2F3 Na3V2 Na3V2 Na3V2 Na3V2 Na3V2 Na3V2 不同原子的兴奋剂.离子电池是一种离子电池.理论上的计算,理论上的计算.具有广泛的温度范围.

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