在离子电池中,用于高电压和稳定性的多增强高度纳西康阴极
Pan Zhu1, Jun Li1, YiPing Wang1
1School of Chemical Engineering, Sichuan University, Chengdu 610065, China.
ACS applied materials & interfaces
|August 11, 2025
概括
研究人员开发了一种用于高能离子电池的新型多增强NASICON阴极 (ME-NASICON). 这种材料实现了高压和特殊的循环稳定性,克服了下一代能源存储的关键挑战.
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:
- 高压阴极 (HVC) 对于下一代高能量密度离子电池 (SIB) 是至关重要的.
- 超离子导体 (NASICON) 材料面临着不可逆转的相位过渡和高电压 (≈4.0 V) 的容量降解的挑战.
研究的目的:
- 为SIBs设计一个多增强的NASICON阴极 (ME-NASICON),以提高高压性能和循环稳定性.
- 通过多元元素兴奋剂战略解决传统纳西康材料的局限性.
主要方法:
- 采用多元元素兴奋剂方法合成了ME-NASICON阴极 (Na4Cr0.7Mn0.65Fe0.1Ni0.1V0.2Al0.2(PO4) 3).
- 评估了电化学性能,包括特定容量,高电流速率的循环稳定性,以及在全电池配置中的能量密度.
主要成果:
- ME-NASICON阴极在0.1°C时达到166.98mAh/g的特定容量.
- 它表现出了特殊的循环稳定性,在10C的2000个循环后保持了69.07%的容量.
- 高的配置导致了最小的格子体积变化 (1.52%),提高了结构稳定性.
- 一个完整的电池 (ME-NASICON//HC) 实现了146mAh/g的特定容量和347.5Wh/kg的能量密度.
结论:
- ME-NASICON阴极表现出高电压,高和卓越的循环稳定性,使其成为先进SIB的有希望的候选人.
- 多元元素兴奋剂策略有效地抑制结构退化和减轻电压歇斯底里,从而提高性能.
- 这项工作为未来的储能应用提供了开发高能量密度和长寿命正极材料的途径.
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